I have a scenerio whereby one public IP is directed to two internal private IP using PAT. A PIX501 is currently in production and an ASA5505 is scheduled to be installed. If the configuration from the PIX501 is ported to the ASA5505 and the devices switched (DSL modem is power cycled), Internat traffic flows through the ASA5505 but inbound traffic to the two devices (SPAM filter and Exchange Server) stops. If I change the ASA 5505 out for the PIX501 (again DSL is powered cycled), traffic flows as designed.
I have attached the current config on the ASA5505. ASA is running 8.2(2)
Can someone help to find where the issue lies on the ASA5505, thanks.
If you are not seeing any hits on the outside interface ACL, most likely
your DSL modem/ISP router has wrong ARP entry for the second IP. Is the DSL
modem in Bridged mode? If so, can you please ask your ISP what MAC entry
they have for the SMTP address?