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Routing trouble between multiple networks

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http://www.unix.com – Hi everyone, Hopefully there is someone here that can help me with the problem I got. At my office I have 1 ubuntu firewall/gateway and several networks. On the firewall/gateway I have three network cards, one for internet, one for network 192.168.100.0 and one for network 172.20.1.0 We use fwbuilder to make the firewall rules and have there defined the three network cards and the two networks. The configuration in /etc/network/interfaces looks like this: Code: # This file describes the network interfaces available on your system # and how to activate them. For more infor (HowTos)