Iptables dport multiple ports example This cheat sheet-style guide provides a quick reference to iptables commands that will create firewall rules that are useful in common, everyday scenarios. This will refresh the previous settings. 0/24 -j DROP. We’ll begin by covering the theoretical aspects of iptables and then demonstrate practical code examples to illustrate how we can manipulate port-based traffic filtering. 0/24 and 84. 2:80 iptables -A PREROUTING -t nat -i em3 -p Jul 8, 2017 · Hello, on CentOS 6, iptables 1. 254/255. 100” on port 80: Dec 5, 2022 · To allow or open a single port in Iptables, run the following command where xxxx is the port number. 2 but i dont know how to forward. x application is a Linux port forwarding rule generator from an YAML file into executable iptables commands. 123. A simple way to do that is to put the following rule with iptables in server A : iptables -t nat -A PREROUTING -p tcp --dport port -j DNAT --to-destination server B:80 However, this simple rule does not work. port argument: Specifies the destination port number. The “–dport 22” spec Jan 31, 2020 · Allowing Multiple Ports with a Single Rule. In the examples below, the rules are inserted at position 1 in the forward chain. iptables -A INPUT -p udp --dport 1195:65535 -j DROP iptables -A OUTPUT -p udp --dport 1195:65535 -j DROP iptables -A INPUT -p tcp --dport 1195:65535 -j DROP iptables -A OUTPUT -p tcp --dport 1195:65535 -j DROP Aug 29, 2021 · Defining multiple addresses using only one iptables command using ! --source is not possible. 53,1024:65535 would therefore match ports 53 and all from 1024 through 65535. Or you can just create your own table to suit your needs as long as its name won't clash with iptables (-over nft API): For example: Mar 1, 2017 · iptables -I INPUT ! -s 1. Add advanced configuration examples, commands, rules Specifying Multiple Ports with iptables -A INPUT -p tcp --dport 22 -m conntrack --ctstate NEW,ESTABLISHED Examples: iptables -A INPUT -p tcp --dport 22 -m state --state NEW -j DROP using all never worked with specifying a port. Unless you specify -m <protocol> or -p <protocol> with a specific protocol you can't use --dport For example, I want to delete every port forwarding from port 80 and here is the iptables: Chain PREROUTING (policy ACCEPT) target prot opt source destination REDIRECT tcp -- anywhere anywhere tcp dpt:http redir ports 8080 REDIRECT tcp -- anywhere anywhere tcp dpt:https redir ports 8443 Dec 18, 2017 · On a linux server/router, I want to block port 80 only for one IP (example : 1. iptables -t nat -A PREROUTING -p tcp -i eth0 --dport 8088 -j DNAT --to-destination 192. To block access to multiple ports, i. 17. 0/24 \--jump DROP. May 8, 2019 · Whether you’re a novice user or a system administrator, iptables is a mandatory knowledge! iptables is the userspace command line program used to configure the Linux 2. 36. So, for instance I have this defined: iptables -A PREROUTING -t nat -i eth0 '!' -s 10. You'd need to *allow* those ports for that source IP and then drop all others (put the 2 port match rules first and then put the drop rule after). What I want is to redirect trafic from server A (port 80) to server B (port 80). 126: iptables -A INPUT -p tcp -m multiport --dports 22,80,443 -s 10. 7. 1:8080. 58:3389 Chain INPUT (policy ACCEPT 64665 packets, 5366K bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 38107 packets, 2782K bytes) pkts bytes Jun 11, 2015 · To use iptables on published ports from docker containers, you need a combination of things: DOCKER-USER table: docker uses this table for iptables rules that affect containers and is reserved specifically for user provided rules that won't be overwritten by the docker engine when it restarts. Oct 19, 2015 · The standard way of DNATing a single port to a different port on an internal network is something like that: ip(6)tables -t nat -A PREROUTING -i wan0 -p tcp --dport 80 --to-destination 10. Looking at the rule below : iptables -t nat -A PREROUTING -p tcp --dport 443 --jump DNAT --to-destination 129. The Insert chain is needed because the default is to insert I've tried the following iptables commands, but it didn't help: iptables -A FORWARD -p tcp --dport 80 -o eth1 -j ACCEPT iptables -A FORWARD -p tcp --sport 80 -o eth0 -j ACCEPT I'm not sure how to go about this. A Address can be either a network name, a hostname (probably a really bad idea to use hostnames), a network IP address (with /mask), or a plain IP address. 126 -j ACCEPT. Port 22 will not be opened by this rule, but 50 other ports will be, using the multiport module. I am able to do this, and everything works properly. ===== Output of ip addr show Multiple individual ports. 25. 78 --dport 22 -m state --state NEW,ESTABLISHED -j DROP Jun 29, 2017 · Another example: iptables -A INPUT -s 192. Apr 21, 2022 · So I tried to block wide range of ports via Iptables. While you can’t specify multiple ports with the tcp module, you can do so with the multiport module. 1 tcp dport { 8888 } dnat 10. rules After rebooting my system I ran sudo iptables -L and the line Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT tcp -- anywhere anywhere tcp dpt:https Nov 13, 2017 · I need an linux firewall rule that will accomplish the following: iptables –A INPUT rule that will accept any packet that comes in over ports 43,53 or 67. Is it possible to change the destination port of a UDP packet using iptables? I'm trying to get an SNMP agent to send out traps on 1620 instead of 162. -A INPUT -p udp -m udp --dport <some port> -j ACCEPT -A OUTPUT -p udp -m udp --sport <some port> -j ACCEPT To be frank though, without listing your current iptables config, there's no way to tell what's going on though you can have some 'dmesg' debug lines to help you out there: Dec 17, 2024 · --dport option: Specifies the destination port for which the rule should be applied. This rule is what I'm trying to make work: iptables -A POSTROUTING -t nat -o eth0 -p tcp --dport 26 -j SNAT --to 172. 1 You can specify multiple rules to cover multiple ports, but also specify port ranges using [port]:[port], or negative matches using !. xxx. 100. The below rules will allow incoming connections from outside to multiple ports, instead of writing multiple rules, we can also write rules with multiple ports together as shown below. conf. XXX. So an example for a web server will be something like that: iptables -A INPUT -p tcp –dport 80 -m hashlimit –hashlimit 45/sec –hashlimit-burst 60 –hashlimit-mode srcip Dec 8, 2005 · Question: how will behave iptables if I will forward one port range to different port range? Example: iptables -t nat -A PREROUTING -p tcp –dport 6001:6999 -j DNAT –to-destination 192. Depending on the exact use case, the duplication can also probably be done on egress (since it's on the loopback interface, the duplicated egress packet will appear back as ingress) but this would require kernel >= 5. Jun 17, 2011 · The multiport extension has a limit (15) for the ports that can be specified. 56. -m multiport enables the use of a list of ports, and that seems to be limited by a variable XT_MULTI_PORTS, which seems to be compiled-in at 15. The client will randomly select one of the specified ports for the initial connection and will periodically switch to a different port. 44. 20. 30:7001-7999 As I know 2. iptables -A INPUT -m state --state NEW -m tcp -p tcp --dport 33332 -j ACCEPT One rule for more ports Jul 30, 2010 · iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A INPUT -i lo -m comment --comment "Allow loopback connections" -j ACCEPT iptables -A INPUT -p icmp -m comment --comment "Allow Ping to work as expected" -j ACCEPT iptables -A INPUT -s 192. Services. Oct 1, 2017 · I have services running on VPS A(1. 2. Jul 12, 2017 · This works just fine. This Python 3. So it w Nov 13, 2017 · I want to port forward requests from NIC1 and NIC2 to a specific server on NIC3. As it turns out, I need to add multiple exclusions. 0/24-m state --state NEW -j ACCEPT. Apr 26, 2020 · In the manpage for iptables-extensions, there is an example given that shows how to block all traffic from an IP address that tries to connect on port 139:. 0/24 -j ACCEPT_TCP_UDP Aug 13, 2012 · Is it possible to add a IPTABLES rule which allows all the protocols for specific source and destination ports? I tried the following but it didn't work. 4 AND port-22 ) AND target-DROP (n) --dport is not a flag for general iptables rules. # iptables -A INPUT -i eth1 -p tcp --dport 80 -j DROP. May 8, 2015 · With this rule i can block that port coming from 1. 4 AND port-22 AND target-DROP), or (2) (NOT ip-1. 40 -p udp --dport 2000 -j SNAT --to-source 10. 125:25 Nov 3, 2015 · One, at least in that manner; --dport (on its own) doesn't take a list of ports. 0/24 --dport 80 To accomplish this on a Linux host, you can make use of the iptables tool to modify the source port of outgoing UDP packets. 10 --sport 54321 -j ACCEPT # route packets arriving at external IP/port to LAN machine iptables -A PREROUTING -t nat -p tcp -d 1. 52. I would like to have VPS B(2. Sep 26, 2023 · In this tutorial, you will learn how to forward ports using Iptables on Linux. Here, were are allowing mysql, Http & Https in a single rule. 230 iptables -t nat -A POSTROUTING -j MASQUERADE Now where I should put the ports that I don't want to forward, like: 22 80 443 2082 2083 2086 2087 20 21? Sep 1, 2014 · I want to open a port on Debian with iptables -A INPUT -p tcp --dport 80 -j ACCEPT, but it's not working. 2 -m tcp -p tcp --sport 22 -j ACCEPT iptables -t nat Mar 18, 2014 · Port 80 worked without any problems, but 443 port tried me a lot of time I guess you've tried already to run the following command: iptables -t nat -A OUTPUT -p tcp -m tcp --dport 443 -j DNAT --to-destination 127. Here's an example rule that you can use to achieve the desired effect: iptables -t nat -A POSTROUTING -s 10. Introduction to the Problem Feb 6, 2019 · Let's say, receive an SNMP trap on UDP port 162, and redirect the package to ports 10162 and 20162 (both of them). Jul 17, 2021 · #!/bin/sh # Make sure the script is indeed invoked logger -t "br100" "firewall-start: applying fw rules for br100" # Allow new incoming connections from br100 iptables -I INPUT -i br100 -m state --state NEW,RELATED,ESTABLISHED -j ACCEPT # Allow br100 access the web UI and SSH of the main router iptables -I INPUT -i br100 -p tcp --dport 80 -j Jul 2, 2006 · There is a multiport match (mport) that allows you to specify up to 15 ports. 4, enter: $ iptables -A INPUT -p tcp -s 1. 0/24 -j ACCEPT iptables -A INPUT -s 198. Having human-readable rule-files is much easier to create Nov 27, 2014 · iptables -t nat -A PREROUTING -p tcp --dport 30000:30200 -j REDIRECT --to-ports 443 redirects ports 30000 thru 30200 to port 443 where the zm webserver is listening. The flag --sports is a convenient alias for this option. Jan 16, 2017 · iptables-A INPUT -p tcp -m tcp --dport 22 -s 59. # list of all names, you might commonly use for this host. Pure port range without multiport module: iptables -A INPUT -p tcp --dport 1000:2000 -j ACCEPT. The iptables can assign this action without setting port range in "--to-destination". Biggest port I've seen in the list is 1194 (openvpn), so I wrote this. Aug 31, 2016 · I would like to be able to distinguish users based on their port. 5. Pay attention to: Which ports are “LISTENING” or “open. 1. iptables v1. Nov 6, 2017 · Instead of allowing just one port (the SSH port, 22), the next example includes a port range. In order to forward incoming http connections from port 80 (default) to port 5000 (which was the port my react app was serving on) I did the following: sudo iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 5000 sudo /sbin/iptables Sep 26, 2020 · To find ALL OF THE PORTS you simply scan the whole damn spectrum of ports and find out which ports work (on which ports your public ports stays the same) and which do not work. Step 4 – Pass Traffic to Forwarding Chains. 10 --dport 54321 -j ACCEPT iptables -A FORWARD -p tcp -s 192. When I scan the localhost: root@debian:~# nmap -p 80 localhost Starting Nmap 6. 4 ) I have been given this example : ### Block Incoming Port Requests (BLOCK PORT) # To block port 80 only for an ip address 1. We’ll take all traffic coming in on IP 10. Unfortunately so far I've only managed to change the source port: iptables -t nat -A POSTROUTING -p udp --dport 162 -j SNAT --to :1620 Oct 18, 2018 · For example, I want to delete every port forwarding from port 80 and here is the iptables: Chain PREROUTING (policy ACCEPT) target prot opt source destination REDIRECT tcp -- anywhere anywhere tcp dpt:http redir ports 8080 REDIRECT tcp -- anywhere anywhere tcp dpt:https redir ports 8443 Oct 14, 2011 · #marking all packets going to 8000 port with label = 1 iptables -A PREROUTING -t mangle -i eth0 -p tcp --dport 8000 -j MARK --set-mark 1 # mark those having label = 1 with source IP = internal load balancer IP iptables -A POSTROUTING -t nat --match mark --mark 1 -j SNAT --to-source 192. 4 kernel was mapping port to port but 2. I haven't, however, found a good example online that demonstrates what I'm asking. The option for controlling the interval is hopInterval in the transport section: Jan 8, 2013 · Well there are like 1 million scripts/tutorials/things for this case, but if someone lands from google to here is something like this: iptables -I FORWARD -d 2. # iptables -A INPUT -p tcp -m multiport --dports 22,80,443 -j ACCEPT # iptables -A OUTPUT -p tcp -m multiport --sports 22,80,443 -j ACCEPT Dec 13, 2011 · Iptables netfilter firewall examples for new Linux sysadmin & developer. 2 r7676-cddd7b4c77 / LuCI openwrt-18. Here is an example of multi port forwarding: ssh remote-host -L 8822:REMOTE_IP_1:22 -L 9922:REMOTE_IP_2:22 Jan 5, 2025 · To check a specific port: sudo nmap -p 22 127. --set setname flag[,flag] where flags are src and/or dst and there can be no more than six of Mar 24, 2016 · second line: "iptables -A FORWARD -p tcp -d 192. Apr 14, 2023 · iptables -t nat -A PREROUTING -p tcp --dport 22 -j DNAT --to-destination 37. In this tutorial, we’ll discuss how to specify multiple source IP addresses in a single rule. 80. We‘re going to walk through a complete example to forward TCP port 80 HTTP web traffic to an internal server at 192. Also I need this site to be accessed from wan:777. Mar 18, 2024 · iptables is a command-line firewall program that uses several policy chains to allow or block network traffic. 1:80 But this is wrong, because the port 443 cannot be redirected to other ports than 443. inet_service ; } % nft add element nat foo { \ 1100 : 192 . My problem is, I am unable to reliably set the --to-source field in iptables. Apr 4, 2022 · iptables -A INPUT -p tcp --dport 4001 -j ACCEPT iptables -A phonesystem -p tcp --dport 4001 -j ACCEPT You're free to add rules in the inet filter table, since there will be no conflict of use. Video games on PC or console have multiple requirements for port forwarding and maintaining the commands can be tricky. This can be used to make a server available on a different port for users. conf on your server: Jan 25, 2023 · Here are the IPTables rules I tried using (to no avail): sudo iptables -t nat -A PREROUTING -i nordlynx -p tcp --dport 5032 -j DNAT --to-destination 192. We’ll discuss the basics of nftables, its advantages over iptables, and how it serves as the modern firewall solution in Linux-based systems. Jun 7, 2022 · This can be done with nftables and netdev family with an ingress chain and a dup statement. 10:80-85 TARGETS A firewall rule specifies criteria for a packet and a target. Two Linux systems with internet connectivity that are linked to the same private network. #iptables -A INPUT -p tcp --match multiport --dports 110,143,993,995 -j ACCEPT Oct 22, 2016 · Match if the source port is one of the given ports. 10 ports 80 through 85 respectively: iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 50000:50005 -j DNAT \ --to-destination 192. wan1's LAN and gateway for wan1 arbitrarily chosen as 84. The “–dport 22” spec is removed, as our port range replaces the single port. 254. 0. Since you are trying to push packages through eth0 (192. This rule is working and allows to connect from "the internet" on port 443 (on VM2). 2:9999” configured the port forward and it’s pretty self-explanatory. 27. The “d” in “dport” stands for destination. Example 4. 2 -i eth0 -p udp -m state --state NEW -m udp --dport 1003 -j DROP – user287842 Commented May 7, 2015 at 20:39 Nov 19, 2018 · iptables -t nat -A OUTPUT -p tcp -d IP1 --dport 54321 -j REDIRECT --to-ports 8080 iptables -t nat -A OUTPUT -p tcp --dport 54321 -j DNAT --to-destination 127. rules post-down iptables-save > /etc/iptables. 2 #allow forwarding back returning packets from web Mar 16, 2019 · Firmware: OpenWrt 18. backup. It also provides examples of basic iptables commands for filtering, connection tracking, logging, and network address translation One can use iptables to forward a specific port to another port using NAT PREROUTING chain. 5) - you don't have IP aliases and you don't have multiple exit IPs but a single IP. Create New Iptables Chain Mar 9, 2015 · To resume, a client is sending mail through a remote server and the remote server itself connect to another remote server on port 587 with SASL authentication. I would like to offer a shorter bit of info that might help people. Host foo foo. Adjust the range to what what you are comfortable with or that meets your needs. 5,192. Specifying a Port Range. 00 ( http: Feb 29, 2024 · It is also possible to configure port forwarding across a range of incoming ports to a single target system. g. 1 Interpreting the Results. Multiple destination ports seem work on the same port range, such as 30000:31000 <----> 30000:31000. At this point, we check whether this connection attempt is a correct match for the next port target: sudo iptables -A GATE2 -p tcp --dport 2222 -m recent --name AUTH2 --set -j DROP This is handled in much the same way as the first gate. All you need is to keep track of ip:ports in a list file, then write a script, e. Both systems have administrative privileges. Sep 19, 2022 · And destination port range specification with following option :--destination-port port:port--dport port:port; For example block lock all incoming ssh access at port 22, for source port range 513:65535: iptables -A INPUT -p tcp -s 0/0 --sport 513:65535 -d 195. XXX -m state --state NEW -m tcp -p tcp --dport 33332 -j ACCEPT Rule to allow access to specific port. Sep 6, 2023 · –dport 22 tells IPTables that we want to focus our attention on port number 22. To open a specific port , like port 8080 for TCP. 32. 51. Opening ports using nftables involves creating appropriate rules that control network traffic flow. Normally, in netfilter/iptables I can write the rule like this. 45. iptables is used to set up, maintain, and inspect the tables of IP packet filter rules in the Linux kernel. 0/16 -p tcp --dport 80 -j DNAT --to 10. 49:80 and then the guide I found here, told me to add POSTROUTING rules to, so: Synopsis; Parameters; Notes; Examples; Synopsis. Then, you can specify the port numbers with --dports. How do I change this rule to say : Feb 19, 2014 · pre-up iptables-restore < /etc/iptables. 2. I used the command below to set up iptables: May 13, 2014 · You have to use --match multiport in the rule for defining more ports. e. Nov 30, 2019 · # create a new chain iptables --new-chain multiple_sources_smtp # send all SMTP connections to the new chain iptables --append INPUT --protocol tcp --dport 25 --jump multiple_sources_smtp # use the default INPUT rules for packets coming from allowed sources iptables --append multiple_sources_smtp --source 10. I would think we could also do this via a firewall rule, but I wanted to see if the easest path was available first Dec 22, 2015 · I tried to add a command like this in my iptables: sudo iptables -A OUTPUT -p tcp --tcp-flags RST RST -d 2. To perform this use multiport as seen in below command. 11 and up seems always mapping 6001:6999 to first port (7001) of 7001-7999 range. So if there are up to 7 ranges (+1 single port), you can do something like: iptables -A INPUT -p tcp -m multiport --dports 1:5,10:50,6666 -j DROP Sep 15, 2021 · To block access to SSH port for a range; iptables \--append INPUT \--protocol tcp \ # Specify TCP protocol--match tcp \ # Load the TCP module--dport 22 \ # Destination port --source 59. 06 branch (git-19. 168. 2) to port forward them to 20000- 22000. org foo. Create a new chain which will accept any TCP and UDP packets, and jump to that chain from the individual IP/port permissive rules: iptables -N ACCEPT_TCP_UDP iptables -A ACCEPT_TCP_UDP -p tcp -j ACCEPT iptables -A ACCEPT_TCP_UDP -p udp -j ACCEPT iptables -A zone_lan_forward -d 1. -m conntrack –ctstate NEW,ESTABLISHED . What I need to do is take an arbitrary port (lets use port 26 as an example) from the HOST and on the NAT machine, translate that to appear to come from the NAT machine on port 25. make sure the entry port is open; sudo ufw allow 110/tcp. 1) on ports 30000-32000. To block port 80 only for an ip Apr 7, 2024 · So, in your case, any packet going to port 80 is redirected to port 8080 (iptables -t nat -I PREROUTING -p tcp –dport 80 -j REDIRECT –to-ports 8080) and then it is filtered by the default DROP policy of the INPUT chain, which I assume you are using, in fact it doesn’t match the ACCEPT rule on port 80 (iptables -I INPUT -p tcp –dport 80 Jul 9, 2021 · Iptables is a software firewall for Linux distributions. org Port 222 Mar 21, 2017 · iptables -I INPUT 1 -s xxx. iptables -A INPUT -s XXX. Back to the point if I want to assign different multiple destination ports, such as 30000:31000 ----> 40000:41000. 55. 1 with a destination TCP port 8888 and DNAT it to IP 10. Current rules im trying based on the above question: Iptables has functionalities to write command to configure multiple ports in a single command. 1. 2:3128 iptables -t nat -A PREROUTING -i tun0 -p tcp --dport 80 -j REDIRECT --to-port 3128 Assuming: tun0 = vpn interface 192. In this port forwarding scenario there are some instances where I do not want it to port forward. There is no limit to the number of ports you can specify. I know how to open a port with firewall-cmd, but that gets bothersome for opening like 40 and more ports. 5:6784. A range of ports. Syntax. Though some rules run faster than others, for example a multiport rule for 15 ports might be faster than the equivalent set rule (like in Hauke Laging's answer). 4) OR port-22 OR target-DROP, or (3) NOT ( ip-1. Notice the use of -i Mar 16, 2013 · I am using following iptables rules for port knocking. This will enable external Internet users to access the web server. However, instead of having multiple Dec 20, 2012 · You can use iptables NAT table to redirect port 80 and 443 to the proxy port (3128 for squid) using: iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j DNAT --to 192. Oct 10, 2015 · I've struggled a lot to find this and finally found a solution that absolutely works, the command in your case would be: iptables -t nat -A DOCKER ! -i docker0 -p tcp -m tcp --dport 32770:32771 -j DNAT --to-destination 172. Example: To append a rule to the INPUT chain to accept TCP traffic from the IP address “192. Apr 13, 2009 · The multiport match module matches a set of source or destination ports. What I want to do: Server 1: forward port 1-10000 to -> [SERVER-2] port 20000-29999. 4 AND port-22 ) OR target-DROP (4) NOT ( ip-1. 7 i can use rule to block IPs in my IPSet from accessing one port, example SSH: -A INPUT -p tcp --dport 22 -m set --match-set blocklist src -j DROP (note that this is not iptables command but a line from a save file "iptalbes-save > output") But how to block Apr 5, 2016 · Thank for your suggestion. For example xxx. 82 iptables -t nat -A PREROUTING -j DNAT --to-destination 151. Feb 22, 2012 · When forwarding ports on ubuntu using iptables, you must: make a backup of your firewall settings; sudo iptables-save > iptables. This is my ipt Example: bash 'block_ports' do code <<-EOH iptables -A OUTPUT -p tcp -d <subnet 1> --dport <port> -j DROP iptables -A OUTPUT -p tcp -d <subnet 2> --dport <port> -j DROP iptables -A OUTPUT -p tcp -d <subnet 3> --dport <port> -j DROP iptables -A OUTPUT -p tcp -d <subnet 4> --dport <port> -j DROP EOH end Dec 2, 2016 · I want to open a range of TCP ports in nftables on my servers. 175. Replace 8080 with the required port number you wish to open: Nov 6, 2017 · # iptables -A OUTPUT -p tcp --dport 22 --dst 192. 5 -dport 6784 -j DROP And I got. The final command would be: Apr 15, 2011 · This document provides an introduction to firewalls using Linux iptables. Multiple ports or port ranges are separated using a comma, and a port range is specified using a colon. How can I achieve this using iptables? I can successfully redirect the package to port 10162 using: iptables -t nat -A PREROUTING -i eth0 -p udp --dport 162 -j REDIRECT --to-port 10162 Is it possible to redirect the package to two Jun 12, 2020 · This module matches a set of source or destination ports. In such case, the following iptable rules applies (for the smarthost) iptables -I OUTPUT -p -tcp -dport 597 -j ACCEPT iptables -I INPUT -p -tcp -sport 587 -j ACCEPT May 14, 2014 · iptables -t nat -I PREROUTING -p tcp -m tcp --dport 30000:40000 -j DNAT --to [local_ip]:10000-20000 Then instead of mapping each port with it's corresponding port all incomming connections on ports 30000-40000 are instead mapped to the same ( random i think ) port on the secondary host ( at the moment they are all going to 13675 ). 2 --jump RETURN iptables May 12, 2014 · I'm relatively new working with iptables but have a decent understanding of the concepts. 1). iptables -A INPUT -p tcp 1000:2000 -j ACCEPT I tried to write in the same way in /etc/nftables. iptables -A INPUT -s 192. iptables -I FORWARD 1 -s 172. x and later packet filtering ruleset. Conntrack is the module that allows IPTables to filter packets not just as individual packages, but as part of a connection. 186 -j DNAT --to-destination 10. example. A port range (port:port) counts as two ports. However, please see Apache reverse-proxy SSL to multiple server applications for my preferred solution to both port redirection and SSL. Next we direct inbound packets from the built-in INPUT chain to our custom chains: iptables -A INPUT -p tcp --dport 80 -j FORWARD_WEB iptables -A INPUT -p udp --dport 51820 -j FORWARD_VPN. It defines what a firewall and iptables are, describes common firewall usages, and explains how iptables is organized into tables and chains. The syntax is as follows to block incoming port using Aug 15, 2017 · # Service on real host port 25 should still be inaccessible because DOCKER-USER # is only accessible via `FORWARD` and not `INPUT` -A DOCKER-USER -i eth0 -m state --state NEW -m tcp -p tcp --dport 25 -j ACCEPT -A DOCKER-USER -j REJECT --reject-with icmp-host-prohibited COMMIT It's still unsatisfying that you are allowing traffic to port 25. I added a prerouting iptables rule to forward all incoming traffic on port 443 to VM2. 40:1000| Let's break down this rule: Oct 10, 2017 · I need to open multiple different ports (not in ranges) on a CentOS machine. A combination of both. Now, perhaps you want to block SSH and VNC access for the IP range. This passes relevant traffic to be processed by our rules. xxx -j ACCEPT Rule to allow specific ip to access to specific port. If you need a port range you can use -m multiport together with --dports like that: Unix one liner to open up multiple ports on IPTABLES. add a prerouting rule in your firewall; sudo iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 110 -j REDIRECT --to-port 3306. May 2, 2018 · # server A - rules already used iptables -A PREROUTING -t nat -i em3 -p tcp --dport 80 -j DNAT --to 192. 0/0 0. Feb 16, 2012 · These entries will forward the port for connections coming from the network or from the local host running the services. Equivalent multiport example: iptables -A INPUT -p tcp -m multiport --dports 1000:2000 -j ACCEPT. Any To open a port or a range of ports in iptables on RHEL, you’ll need to use the iptables command to configure the firewall rules. Each time a rule is added, it just pushes the next ones down. 2 on TCP port 9999. Make sure to restart the iptables service after the change. 254 -p tcp --dport 80 -j DROP In this example forward traffic to internal hosts for two source ip address: -A PREROUTING -i vboxnet0 -p tcp -m tcp --dport 80 -j DNAT --to-destination 192. It requires using a mark to avoid an infinite loop. ” The processes (PID) or service names associated with each open port. Let's add a user who should only have access to the LAN. 36:1000-1002/32770 # allow inbound and outbound forwarding iptables -A FORWARD -p tcp -d 192. 31. These are loaded when you use -p protocol or -m. For example, to apply the rule to all ports except 53 (domain) and 22 (ssh) you could do the following: Dec 27, 2023 · Now let‘s get our hands dirty with real examples! Step-by-Step Guide: Port Forward Web Traffic. 1:443 # server B - new rules iptables -A PREROUTING -t nat -i em3 -p tcp --dport 80 -j DNAT --to 192. We must add the following rule: Jul 13, 2024 · I have the following iptables rule that forwards all incoming traffic to an ip in the local network 10. sudo iptables -t nat -I PREROUTING -p tcp --dport 443 -j REDIRECT --to-ports 8443 sudo iptables -t nat -I OUTPUT -p tcp -o lo --dport 443 -j REDIRECT --to-ports 8443 Feb 23, 2016 · I use several PREROUTING rules in Jessie Debian to do port forward from WAN to LAN ip with following rule. a bash script like the followings, and reload ip:port's from that file Jul 29, 2011 · -A POSTROUTING -d <destination ip> -p tcp --dport <start of port range>:<end of port range> -j SNAT --to <receiving ip> --sport <start of port range>:<end of port range> be sure to accept connections to that port range:-A INPUT -p tcp --dport <start of port range>:<end of port range> -j ACCEPT Another simple solution would be to simply setup an SSH configuration file for the server and specify the port in your config. You'll have to adapt the answer to fit the actual configuration. 4 --dport 80 -j DROP $ iptables -A INPUT -i eth1 -p tcp -s 192. sudo iptables -A INPUT -p tcp --dport xxxx -j ACCEPT For example, to allow the default MySQL port 3306, run the command: sudo iptables -A INPUT -p tcp --dport 3306 -j ACCEPT To confirm that the rule has been applied, list the Iptables rules as Oct 10, 2010 · On VM2 a load balancer is running on port 443 (and yes I want to have it there and not on the host machine). These rules allow Mar 23, 2018 · iptables traverses every rule from the table until a match with a terminating target is found, so fewer rules means less CPU usage. Hey guys in my iptables file I have the following line:-A INPUT -m state --state NEW -m tcp -p tcp --dport 20000:25000 -j ACCEPT Because I'm trying to open a range of ports that will need to be open for multiple (Yes THAT many multiple) different minecraft servers. 94. 6 -d 192. 10:54321 Jun 14, 2011 · With “limit” match you can limit the global rate of packets per time interval, but with “hashlimit”, you can limit them per IP, per combination IP + port, etc. 15. I am new to this. Apr 29, 2015 · Exactly what NaN answered, you specify multiple -L arguments. 2 is Apr 28, 2017 · Now that the address is past our first rule in this chain, it is in a clean state with no flags. On lan:80 I have a site that must be accessed from local network. This is what I have so far: The below guide can be used for redirecting ports. iptables -A INPUT -m state --state NEW -p tcp --dport 22 --source xyz -j ACCEPT Oct 13, 2020 · For an unreasonable approach, this could be done in-kernel, either with iptables with difficulty (example for only two duplicates in my answer in this UL SE Q/A), or with nftables which can do stateless NAT avoiding some complexity related to conntrack zones. Everything works well, but I would like to improve it by being able to knock from HOST_1 and thereby opening the SSH port for HOST_2. For example, to open ports 22, 80, and 443 over TCP from IP address 10. Iptables Port Forwarding I am looking for a way to forward all traffic(to any port) from a pc to a certain ip. Jan 14, 2020 · And you can block everything in the list for example with: iptables -A INPUT -m set --match-set blocklistip src -j DROP iptables -A INPUT -m set --match-set blocklistipport src,dst -j DROP Above src,dst means use the source IP address along the destination port address in the packet when looking for a match in the hash:ip,port set. 4 -dport 22 -j DROP Does the "!" mean (1) NOT ( ip-1. 1:8080 Reading definitions of DNAT and REDIRECT still leave me confused what should work here. 6. If the packet does not match, the next rule in the chain is the examined; if it does match, then the next rule is specified by the value of the target, which can be the name of a user-defined chain or one of the special values ACCEPT, DROP, QUEUE or RETURN. config redirect option target 'DNAT' option src 'wan' option dest 'lan' option proto 'tcp' option src_dport '53 80 3074' option dest_ip '192. 88:5000 this tells me all traffic destined for port 443 should be diverted to 129. 242. For example, TCP ports 50000-50005 could all get mapped to 192. We will also address a few FAQs on how to forward ports with Iptables on Linux. 2 These are NAT related IPTABLES Apr 8, 2018 · As a matter of fact iptables can do it fast enough and I have tested that for nearly 1900 rules. 17 for support, while ingress has Aug 5, 2013 · I got the solution myself as below: I added a new IP in sub interface(eth0:0), with my required NATting IP. Use the public key shown in step 4 to add the following block to /etc/wireguard/wg0. Add NAT forwarding using PREROUTING chain $ sudo iptables -t nat -A PREROUTING -p tcp --dport 81 -j REDIRECT --to-port 80 Jul 10, 2023 · The first command in the list flushing all rules, the -t nat -F flushes the nat table, -t mangle -F flushes the mangle table and the final -X deletes all the chains. Do you have to have -p "protocol" before --dport 43,53,67 or can you take out the -p "protocol" and just have the --dport 43,53,67. 8. Mar 20, 2019 · > iptables -v -L -n -t nat Chain PREROUTING (policy ACCEPT 74141 packets, 6573K bytes) pkts bytes target prot opt in out source destination 1 60 DNAT tcp -- eth1 * 0. I do this all the time. 4 --dport 12345 -j DNAT --to-destination 192. Repeat steps 1 to 5 from the First admin client section above. SSH and VNC access for a range; Multiple NAT mapping with address and port You might also need to define a NAT mapping that includes the IP address and port, such as: % nft add map nat foo { type inet_service : ipv4_addr . 200 --dport 8080 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT" is NOT required if you don't have firewall restrictions/security, which is the case with most of home LANs, otherwise be careful with -A, be cause it will add it AFTER restrictions/security and may not work (so check -I instead, that is adding IN FRONT of iptables rules) Jun 17, 2014 · # Setting default policies: iptables -P INPUT DROP iptables -P FORWARD DROP iptables -P OUTPUT ACCEPT # Exceptions to default policy iptables -A INPUT -p tcp --dport 80 -j ACCEPT # HTTP iptables -A INPUT -p tcp --dport 443 -j ACCEPT # HTTPS iptables will go through the list of 'exceptions' until it finds a match. 31' option dest_port '53 80 3074' option name 'Allow-Xbox-Live-TCP' config redirect option Mar 11, 2022 · so, this is a lot of info. (You may take a look at the demo graph link below to unde Mar 20, 2020 · As the answer is tied to the configuration, I make some assumptions. 41695-6f6641d) I am trying to forward multiple ports to some devices. example # real hostname Hostname real. There might be cases where we need to specify multiple source IP addresses for filtering packets. 11 This will prevent 10. iptables -A FORWARD -m recent --name badguy --rcheck --seconds 60 -j DROP iptables -A FORWARD -p tcp -i eth0 --dport 139 -m recent --name badguy --set -j DROP May 30, 2022 · Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Dec 11, 2014 · Link at the bottom of your question is aimed at people who have multiple exit IPs. ; This module does not handle the saving and/or loading of rules, but rather only manipulates the current rules that are present in memory. This is a single section of the command. 2 sudo iptables -t nat -A PREROUTING -d 172. 88:5000. 0 -j ACCEPT iptables -P INPUT Apr 14, 2013 · So, common rule on iptables are : Accepting packet on input from a specified port (25 for mail) whatever the state of connection -A INPUT -p tcp --dport 25 -j ACCEPT Accepting to send back packets for all established connection whatever the destination port. xx. 2 . 1:80 iptables -A PREROUTING -t nat -i em3 -p tcp --dport 443 -j DNAT --to 192. 200. Prerequisites. I haven't ever tried using the logical ! operator with it, but it may work. Oct 13, 2020 · Port Forwarding can be performed with IPTables to an instance from a Linux host. 30. 238 with eth0:0. 200/16 from accessing this rule. 06. Is that possible? Then we could look at that header info in a script to figure out who was connecting. . If not, then you likely need to do the inverse of what you're trying to do. So for example if I started the server on port 3478 and 3479 (default STUN ports) and port 5000, I have observed that my public ports stays the same for ports 3478 and Jan 13, 2021 · The 4th command: “add rule nat prerouting ip daddr 10. Jan 8, 2010 · Examples: • allow 2 telnet connections per client host: iptables -A INPUT -p tcp --syn --dport 23 -m connlimit --connlimit-above 2 -j REJECT • you can also match the other way around: iptables -A INPUT -p tcp --syn --dport 23 -m connlimit --connlimit-upto 2 -j ACCEPT • limit the number of parallel HTTP requests to 16 per class C sized Nov 17, 2024 · In this tutorial, we’ll briefly look at nftables and how to use it to open ports. It's a flag for one of it's extended packet matching modules. May 20, 2024 · Customize the example with your real IPs/ports. 2 -m comment --comment "Accept to forward ssh traffic" -m tcp -p tcp --dport 22 -j ACCEPT iptables -I FORWARD -m comment --comment "Accept to forward ssh return traffic" -s 2. Nov 26, 2020 · TCP port 22 – OpenSSH (remote) secure shell server; TCP port 110 – POP3 (Post Office Protocol v3) server; TCP port 143 – Internet Message Access Protocol (IMAP) — management of email messages; TCP / UDP port 53 – Domain Name System (DNS) Linux block Incoming Port With IPtables . Here’s an example of how to forward multiple ports: Open the iptables configuration file for editing: May 25, 2024 · This question was fairly close, but no working answers: Use iptables to port forward multiple ports. But I need to specify much more port numbers in a single rule, so I tried to use several multiport in one rule like: iptables -A INPUT -p tcp -m multiport --destination-ports 59100 -m multiport --destination-ports 3000 -m state --state NEW -j REJECT --reject-with tcp Oct 2, 2024 · In this article, we’ll go through how to use iptables to manage multiple ports efficiently. FORWARD Chain When adding an IPTables port forward, but sure to use the -I (capital i) to insert the rule. I have a debian box with two interfaces wan and lan(192. The syntax is as follows for the destination port: Feb 17, 2023 · To forward multiple ports using iptables in Linux, you can use the multiport module to specify a range of ports or a comma-separated list of ports. 6:8088 ETH0 is public static IP ETH0:0 is Local lan ip 192. 2 = IP of your server on tun0 (vpn) Mar 25, 2023 · It's also not too hard to create rules that look at the direction of the connection with iptables, just allow existing connections with iptables -A INPUT -m state --state ESTABLISHED -j ACCEPT and then make rules for new ones with e. multiport: A module for managing multiple ports simultaneously. This includes iptables examples of allowing and blocking various services by port, network interface, and source IP address. 254 -p tcp --dport 443 -j ACCEPT In this example DROP packets for port 80 for two ip address: iptables -A INPUT -s 192. 3. Instead of allowing just one port (the SSH port, 22), the next example includes a port range. The most simple path I can imagine would be if we could configure mimtdump to listen on more than one port. 020. (You may take a look at the demo graph link below to understand what I would like to achieve :D ) Forward to different ports. 114. 4. Up to 15 ports can be specified. In order to do some brute-force intrusion mitigation, I've got a chain that includes a rule covering multiple ports (this rule originally hijacked from this blog): May 11, 2024 · To open multiple ports at once, use the multiport module and the --dports option, listing the ports separated by commas. It can only be used in conjunction with -p tcp or -p udp options. DUP STATEMENT Oct 1, 2017 · I have services running on VPS A(1. 0/0 tcp dpt:1912 to:192. nftables uses iptables's TEE equivalent: dup. tcp dport {1000:2000} accept but nft reports Examples: iptables -A INPUT -p sctp --dport 80 -j DROP iptables -A INPUT -p sctp --chunk-types any DATA,INIT -j DROP iptables -A INPUT -p sctp --chunk-types any DATA:Be -j ACCEPT set This modules macthes IP sets which can be defined by ipset(8). 21: multiple -d flags not allowed I'm trying to drop RSTs sent from my machine to 2. pebtt zuwt lsnlebr wetlz mdmz whj drti dzg gzvniu asmhmi