i have amazing problem. i tryed to nat one of my private ip address to one of my public ip address in fwsm. it worked fine. for example, nat 192.168.1.1 to 126.96.36.199. my 6500 switch is connected via one 3560 switch to internet and all of my LAN devices connect via fwsm to internet. one of these servers is my isa server. Amazing problem start when:
if i connect one of NIC on isa server directly to3560 (this switch can directly connect to internet) and change the ip address on nic to 188.8.131.52, and change gateway address from FWSM to router interface that connected directly to internet, then isa server will work correctly and has internet. then if i return to previus config (change ip address on isa NIC from 184.108.40.206 to 192.168.1.1 and change gateway to FWSM ip address) it is not possible to access internet!!!
i test this experience with another public ip like 220.127.116.11 and result was same as before. i tryed to clear arp table on both fwsm and 3560 but problem didnt solve. please some one tell me why this problem happen and why i can not use my previous successful ip again? i had this problem in scenario like this on NETSCREEN500