Recently I've installed a cisco firewall on my network (model isa550). But I have a problem. On my network I have optical fiber so the ethernet cable goes from the optical network termination to the router. Where I have to connect the firewall? I mean.. the WAN port of the router is busy.. so.. I have to connect the firewall to a LAN port? (the router is a comtrend).
The fact is that I have connected the firewall to a LAN port of the router.. but it doesn't works as it should.
If anyone has any idea please tell me :)