Hello All, Network Address Translation is the ability to translate from a series (pool) of public IP addresses to private Ip addresses in a one-to-one fashion. From my experience, and from reading material, ISA's implementation of NAT ir really PAT. Where the ISA server maintains a table of port to IP addresses, i.e. a Socket table. The reason for the question is because there is no way to assign a pool of IP addresses within ISA as you can within RRAS. The NAT configuration is not exposed anywhere in the ISA MMC interface.2 - Thanks. Nathan Sutton.