It isn't a new idea IIRC.
http://www.wilderssecurity.com/showthread.php?t=197458
http://www.broadbandbuyer.co.uk/Shop...ProductID=2922
http://www.firewallguide.com/broadband.htm
:)
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I think you're confusing a home network and a "real network"... I mean those devices aren't even really routers... They are poorly named NAT devices. If they were real routers you could layer them behind each other and everything would go off without a hitch... that isn't the case :).
I actually really like the idea of incorporating AV into the home "router". They're already responsible for so many other things (DHCP, DNS, "Routing", Filtering), why not add AV to the mix.
Personally I'll stick with my install of m0n0wall and no AV... but to each their own.