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I have problem with IP public, my Network configuration [wireless] <------> [Router] <------ > [ Linux proxy ] < ------ > [Client ] IP configuration [202.123.123.1] <------->[202.123.123.2 and 192.168.0.1] < ------ > [192.168.0.2 and 202.123.123.3] < ------ > [202.123.123.4] this configuration will use IP 202.123.123.2 on internet how to config my network

We are using Shorewall 2.0.8 with SuSE 9.1 and have built a bridging firewall primarily to defend against syn flood and smurf DoS attacks. We are a small ISP using Cisco routers for a total of 5-6 subnets. Since bridges are based on use of MAC addresses, if we could use one bridging firewall system instead of 5-6 ... is this possible? practical? (Other than introducing a single point of failure