The question of "what kind of client is it?" is a relatively simple one if you ignore the associated questions of "what is it doing?" and "what does ISA provide for that request?", but we're not going to do that.
There are three distinct types of ISA clients; SecureNAT, Firewall and Web. Each client type is more a concept than a fact, meaning that it depends on how the LAT host and ISA Server are configured and what the LAT host is trying to do than anything else. Consequently, it's more accurate to think of them in terms of "client request" than "client".
It's entirely possible (and even desirable in some cases) for a LAT host to be configured as a SecureNAT, Firewall and Web client all at the same time. It's the request and how it's being made to ISA that determines what kind of client the LAT host is at the time. If you think that's confusing, read on…
ISA Operating Modes:
Now select the Backup Route tab. This setting allows IE to use an alternate means to reach the Internet if the primary ISA server is unresponsive. There are two options:
That's it for today; feel free to contact me with comments.