NAT questions

txn41655

If there 2 directly connected routers Inside network, do we need to configure NAT on both routers or only one? If so how should NAT be configured Inside for s0/1/0 on both routers ?Thanks.

OctalDump

It's two private networks connected via a public network. The private ranges are non-routable so NAT is required on both sides.

TechGuru80

OctalDump wrote: »

It's two private networks connected via a public network. The private ranges are non-routable so NAT is required on both sides.

I think op is actually referring to the border router and the one just inside of that, not routers that are separated by the public network. That assumption is based on the arrows in the diagram.

Op if that assumption is correct...you would only technically have to configure NAT on the border router (the router facing your ISP or the public network). You would have to direct unknown traffic for the most inside router, to the other router though.

OctalDump

Yeah, to make that more explicit, Outside Router 1 and Inside Router 1 both need NAT because one of the interfaces (the 'inside') is private range. It's a bit more complicated than you'd normally see on a CCNA/CCENT exam, since the actual NAT configuration becomes complicated by the fact you are NATting a range that isn't directly attached. There's probably another way to do this, as well.