ISP B was originally plugged into an ASA5510. So on this I have a whole world on NAT and PAT translations for internal servers. My external interface on the ASA was the 22.214.171.124/32 address and I PAT for all internal going outbound. Static NATs are assigned to the /29. So my new topology now looks like this.
What I need to know here is how do I get from firewall to router. If I asssign another /32 between fe0 and gi0/0 do I not end up doing double nat? The end user also manages the firewall at the moment and I dont want to have to do the translations on the router. Is this even possible? I have search the internet for many many hours now trying to find an example but have failed miserably.
But I only want my existing NAT through ISP B. I am using Policy Based Routing on these as I have specific traffic I need to go through ISP A.
Appreciate everyones feedback as Im now numb trying to find the solution.
I think the only way you'll avoid doing NAT on the router itself is if you can use one of your /29 addresses as the new outbound PAT address on your ASA. Either way, you're going to have to create a new /30 range between the ASA and the 2911, and the 2911 will need to have routes to your /29 pointing back to the ASA.
If you don't have an extra address, you'll have to do a PAT on the router interface.
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