Ops, rahla napakica v rc.firewall, prav je:
iptables -t nat -A POSTROUTING \
        -s 192.168.100.0/24 -o eth3 -j SNAT --to-source 212.18.43.96
iptables -t nat -A POSTROUTING \
        -s 192.168.200.0/24 -o eth4 -j SNAT --to-source 212.18.43.97
Janko