SuSEfirewall2 on multiple servers but no "firewall"

Hi, I will have to install several servers all connected only with a switch and no standalone Firewall-Server. Looks like this: ( | ISP ROUTER | ) | | | SWITCH | | ----------------------- ... | | | SERVER #1 | | SERVER #2 | ... I plan to install SuSEfirewall2 on every server and blocking all traffic from other IP-Adresses than my own range. All servers do only have public IP-Adresses. My Question: 1. Is that feasable? 2. Is that total nuts? 3. Has running the firewall on every server a hard performance impact? 4. If 2.) is true, how would I set up a failsafe setup with 2 SuSEfirewall2 Servers? Many thanks for digging into my humble mind :) Peter