{ lib, ... }: { krebs.iptables.tables.filter.FORWARD.rules = [ { v6 = false; predicate = "-d 10.233.2.0/24 -o ve-+ -m conntrack --ctstate RELATED,ESTABLISHED"; target = "ACCEPT"; } { v6 = false; predicate = "-s 10.233.2.0/24 -i ve-+"; target = "ACCEPT"; } { v6 = false; predicate = "-i ve-+ -o ve-+"; target = "ACCEPT"; } { v6 = false; predicate = "-o ve-+"; target = "REJECT --reject-with icmp-port-unreachable"; } { v6 = false; predicate = "-i ve-+"; target = "REJECT --reject-with icmp-port-unreachable"; } ]; krebs.iptables.tables.nat.PREROUTING.rules = lib.mkBefore [ { v6 = false; predicate = "-s 10.233.2.0/24"; target = "ACCEPT"; } ]; krebs.iptables.tables.nat.POSTROUTING.rules = [ { v6 = false; predicate = "-s 10.233.2.0/24 -d 224.0.0.0/24"; target = "RETURN"; } { v6 = false; predicate = "-s 10.233.2.0/24 -d 255.255.255.255"; target = "RETURN"; } { v6 = false; predicate = "-s 10.233.2.0/24 ! -d 10.233.2.0/24"; target = "MASQUERADE"; } { v6 = false; predicate = "-s 10.233.2.0/24 ! -d 10.233.2.0/24 -p tcp"; target = "MASQUERADE --to-ports 1024-65535"; } { v6 = false; predicate = "-s 10.233.2.0/24 ! -d 10.233.2.0/24 -p udp"; target = "MASQUERADE --to-ports 1024-65535"; } ]; boot.kernel.sysctl."net.ipv4.ip_forward" = lib.mkDefault 1; }