... and I want all udp and every tcp port that is NOT listed above to use the vpn while the rest goes through the isp. All other IP addresses should "remain" on port … I started out with. iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 26 -j REDIRECT --to-port 25 iptables -t nat -A PREROUTING -i eth0 -p udp --dport 26 -j REDIRECT --to-port 25. Incoming TCP and UDP connections on port 900 from the resolving IP address of myip.dyndns.org (dynamic IP) should redirect to port 5050 on the local machine. ... iptables redirect traffic from VPN interface to next interface. # iptables -t nat -A PREROUTING -p tcp --dport 81 -j REDIRECT --to-ports 8080 Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. Hello, Using FreePBX with Asterisk 1.6.2.6 and Orgasmatron52 I have a D-Link dir-655 router/firewall that has all the configurations set up for port forwarding on UDP port 5060. We use the TEE target of the mangle table to clone the incoming UDP packets on port 12201 (Graylog's UDP port) and redirect it to the local loopback address. As this process modifies the destination of the packet in-flight, it is considered a type of NAT operation. 2. Using iptables, I want to redirect all DNS lookup traffic to a specific IP and Port (5353).

Is it possible to change the destination port of a UDP packet using iptables? iptables -t nat -A PREROUTING -p tcp --dport -j REDIRECT --to-port Example: root@asimov:~# iptables -t nat -A PREROUTING -p tcp --dport 1234 -j REDIRECT --to-port 80. Hello, I am currently trying to limit incoming UDP length 20 packets on a per IP basis to 5 a second using IPTables on a Linux machine (CentOS 5.2). The problem is that the port is not open on the servier side and can be verified by using the Open Port Check URL. I'm trying to get an SNMP agent to send out traps on 1620 instead of 162. Cloning the incoming UDP packet. Cloning the incoming UDP packet.

Any attempt for my computer to connect to another computer on port 53 should be redirected to 23.226.230.72:5353. 需求很简单，把本地81端口映射到8080端口上 1. sudo iptables -t nat -A sshuttle-12300 -j RETURN --dest 127.0.0.0/8 -p udp sudo iptables -t nat -A sshuttle-12300 -j REDIRECT --dest 0.0.0.0/0 -p udp - … We use the TEE target of the mangle table to clone the incoming UDP packets on port 12201 (Graylog's UDP port) and redirect it to the local loopback address. Tout le traffic arrivant sur le port 26 sera renvoyé en local sur le 25. I'd rather not have to hack the source code as the author of that thread ended up doing. 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 iptables -t nat -A PREROUTING -p tcp --dport 55242 -j DNAT --to :35000 iptables -A FORWARD -d -p tcp --dport 35000 -j ACCEPT sysctl net.ipv4.ip_forward=1 the first line puts a iptables rule to change the destination address and port for traffic directed to #1:55242 , setting them to #2:35000. I am trying to write an iptables rule that will redirect all outgoing UDP packets to a local socket, but I also need the destination information. 所有的81请求转发到了8080上. # iptables -t nat -A PREROUTING -p tcp --dport 81 -j REDIRECT --to-ports 8080 This server receives updates from clients, and pings back the clients every 5 seconds to the socket they were connected from. In that case, you are opening ssh port only to IP 10.1.1.2, if you need to open DNS for your internal network. Incoming TCP and UDP connections on port 900 from the resolving IP address of myip.dyndns.org (dynamic IP) should redirect to port 5050 on the local machine. This is for a new SIP trunk that will use UDP port 5060 in FreeePBX. Et voilà ! In this guide, we’ll demonstrate how to use iptables to forward ports to hosts behind a firewall by using NAT techniques. 需求很简单，把本地81端口映射到8080端口上 1.

iptables prerouting to redirect port Hasan Erhan AYDINOĞLU Thu March 19, 2020 02:47 PM Hi I am trying to redirect traffic coming to 514 port to 517 only for source 10.0.0.198 I … iptables -t mangle -A PREROUTING -i eth0 -p udp –dport 12201 -m state \ –state NEW,ESTABLISHED,RELATED -j TEE –gateway 127.0.0.1.