We have a cisco 5510 connected to a LAN segment with a cisco 6500 and multiple vlan's. and using Class B address range.
We have a NAT device (Non-cisco product ) on top of the Cisco ASA-5510 handling all the static and Dynamic NAT.
We have lots of internet users and about 50-60 servers all in the Lan segment.
since the ASA is not doing the NAT i can use
nat (inside) 0 172.16.0.0 255.255.0.0
to exempt all traffic from NAT right??
but when i do this i am having issues accessing a few servers from the outside that have been Static NAT on my NAT device. ( this is the problem only with few servers, all others are fine and normal internet users also have no issues to the best of my knowledge).
I have found a remedy by using something like
static (inside,outside) 172.16.0.0 172.16.0.0 netmask 255.255.0.0
Everything is working perfect with this instead of the "NAT 0"
What could be causing the access issue with NAT 0.