Iptables for different types of NAT
www.linuxcompatible.org › discussion › iptables-forMay 06, 2010 · • Symmetric: A symmetric NAT is one where all requests from the same internal IP address and port, to a specific destination IP address and port, are mapped to the same external IP address and port. If the same host sends a packet with the same source address and port, but to a different destination, a different mapping is used.
NAT - LRI
https://www.lri.fr/~fmartignon/documenti/reseauxavances/NAT-Netkit…Symmetric NAT (défini dans le RFC 3489) Des requêtes provenant du même host interne (I_IP,I_port) et pour une même destination (D_IP,D_port) sont mappées sur le même couple externe (E_IP,E_port) - Paquets provenant du même (I_IP,I_port) mais avec destinations différentes sont mappés sur un couple (E_IP,E_port) différent.
Simple symmetric NAT Setup using IPTABLES
lists.debian.org › debian-security › 2006Jan 23, 2006 · > echo "1" > /proc/sys/net/ipv4/ip_forward to set the ip_forward table ON The above commands I used for making NAT1 symmetric, For making it port restricted, I change the POSTROUTING command above and make it like this: > iptables -A POSTROUTING -t nat -p udp -s 192.168.0.2 -o eth0 -j SNAT --to 172.25.25.41:8080 Here NAT1 will change the source address of ClientA packets to same address for routing.