we are planning to replace Cisco ASA5520 which is a 2nd tier firewall with TMG 2010. Is it advisable to do so ? We have ironport Mail security Appliance on outside interface of tier 2 firewall.The 1st tier firewall inside interface and 2nd tier firewall outside interface are in same network segment.
We also like to compare advantages/disadvantages and features of TMG 2010 and cisco 5520
Kindly provide us with ur valuable comments