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VPN Interoperability

Are there issues with using a VPN client on a host on a local network (LAN A) to connect to a remote network (LAN B) when the WAN router already is establishing a tunnel to either that same remote network (LAN B) or a different remote network (LAN C)?

Thank you.

1 REPLY
Cisco Employee

Re: VPN Interoperability

If the WAN router is also doing PAT for all the internal hosts, then yes because it will PAT the ISAKMP packets from the inside host to it's own outside address, then when the return packet comes in it will possibly interpret it as being destined for itself (I've seen it before).

Why would you want to build a VPN to a network when you already have an existing VPN to that network?

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