Been few years outside the routing /switching world...is there any config out there that supports NO nat between 2 IPSeC IOS endpoints...ie traffic goes untranslated from one side LAn to other ...if we avoid NAT statements ...will this be enough just put a crypto acl between LAns with no NAT statements ?
Appreciate patient pointers ..if this is a noob query
It requires a bit more than just a crypto ACL though that is an important part of it. First we need to clarify whether you need multicast or a routing protocol over this connection. If so you need GRE with IPSec. If not then just IPSec is enough.
You will need to configure an ISAKMP policy a shared key and a crypto map for this connection. The crypto map will include an access list to identify the traffic to be protected over this connection. And the crypto map needs to be applied to the outbound interface.
I guess i did oversimplify this i had already accounted for a phase 1 isakmp and phase 2 ipsec and crypto map with appropriate ACL....i guess my question was how do i ensure traffic entering the tunnel is not NATTed ....ie the far side of tunnel sees the near end side with same IP address ...with no NAT ..i guess will a NAT exclusion in the NAT statement suffice ?
yes this is a IOS to IOS router ...and if im reading right ...if i declare isamp policy, Ipsec policy, cryptomap with crypt ACL and bind the crypto to interface it should be enough ..by default in absence of NAT statements on the interfaces and ACLs ..the traffic would flow UNNATED to the other side ?
As for now i dont have NAT statements....i just have one more query ...would this be possible for a scenario like below (apologize if this is getting less simpler)
The source network of crypto ACL is on the outside interface( and not the inside) ? and it needs to make use of the same interface "outside" to initiate the tunnel to far side which is multiple hops away on the "outside"...please imagine direct public ip adddress on the outside interface of a router to make use of the outside interface to create a secure tunnel to some other peer over multiple Hops possibly internet
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