My old pal’s from the System Network and Attack Center at the NSA have a great guide on securing routers. The Router Security Configuration Guide has a good amount of the networking basics and then goes into a lot of hands on configurations and best practices. Cisco routers are covered specifically but I would imagine that a lot of the commands would be the same for other routers that support CLI. Combining information from this guide along with using the Router Audit Tool (RAT) from the Center for Internet Security will get you going in the right direction.
I think that routers are one of the most overlooked pieces of perimeter security. A finely tuned border router can do a lot for you and your security posture.
Technorati Tags: NSA, SNAC, router, information security
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