If you need to insert the rule, because there is a DROP at the end, you have to use -I and put a number behind the chain name. The filter table is where you configure the FORWARD rules if there is a DROP policy.The -A before PREROUTING/POSTROUTING means Append. You should also check that the default policy for the FORWARD chain is ACCEPT or add specific rules in that chain.ĭumping the existing filter and nat tables can be done with iptables -S -t filter and iptables -S -t nat. You could further exclude broadcast and multicast traffic by using -m addrtype -dst-type UNICAST -src-type UNICAST. If you want to limit the forwarding to only packets from outside you have to modify the rules, either add a -i interface naming the interface where they come in or match everything that did not originate from a local address -m addrtype ! -src-type LOCAL. Ip6tables -t nat -A POSTROUTING -j MASQUERADE So one rule only is needed: iptables -t nat -A PREROUTING -d 192.168.55.0/24 -i eth0 -j NETMAP -to 192.168.42. It can only be used from rules in the nat table. Ip6tables -t nat -A PREROUTING -d -j DNAT -to-destination Best Answer From man iptables-extensions: NETMAPThis target allows you to statically map a whole network of addresses onto another network of addresses. Iptables -t nat -A POSTROUTING -j MASQUERADE ![]() Iptables -t nat -A PREROUTING -d .ss -j DNAT -to-destination .ss #Note: These forward settings are not reboot persistent This also does NOT redirect traffic generated by locally executing programs, for that you need the OUTPUT chain. Quick examples for forwarding traffic coming from outside and interfaces within the same machine from address original to another address for ip versions 4 and 6 (possibly excluding ipsec traffic with an endpoint on the original address and existing connections at point of execution).
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