As I understand it, you are talking about IP forwarding based upon the application which requires rewriting the layer 3 header. Routers typically dont rewrite layer 3 headers (save for NAT/PAT), layer 4 devices do...
If I'm not mistaken, NAT/PAT rewrites only source addresses/port, but not destination addresses/port. It sounds like these lookups traverse your firewall, in which case I'd suggest an application proxy for DNS (or just caching DNS) could be set to forward all lookups to an alternate destination DNS server. This would rewrite the layer 3 header destination address. Option 2 is setting internal DNS servers to resolve to a different external DNS server And, option 3 is perform a planned change on the client DHCP scope with the alternate address for the DNS resolution. Andy Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=42443&t=42353 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
