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iptables -t nat -A PREROUTING -p tcp --dport <origin-port> -j REDIRECT --to-port <destination-port> service iptables save service iptables restart


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I seem to have found the problem: I needed to compute the IPv4 header checksum for the incoming packets before writing them to the TUN interface, since I modify them.


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You will need both sets of rules within iptables. The two rulesets ensure that traffic leaving by the specified interfaces is appropriately masqueraded. Here is my suggestion, which is a little simpler than yours: # Masquerade outgoing traffic iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE iptables -t nat -A POSTROUTING -o tun0 -j MASQUERADE # Allow ...


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The handy tool is to list existing rules with line-numbers: iptables --line-numbers -t filter -L FORWARD You could delete the rules with -D option: iptables -t filter -D FORWARD 1 You could insert a new rule at specified location with -I option: iptables -t filter -I FORWARD 0 blah-blah-blah this would insert a new rule at the very beginning of a ...



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