Rob Hudson wrote:

> If more than one person is on ICQ behind the firewall, how does the
> firewall know which message goes to who?

Each TCP connection (ICQ or anything else) has a host IP address and a
port number (1 to 65535).  The NAT gateway remembers how to translate
between port numbers on the outside and host+port pairs on the inside.

Same thing happens if two people are browsing the same web site.

(Feel free to laugh at me if ICQ doesn't use TCP.)

-- 
Bob Miller                              K<bob>
kbobsoft software consulting
http://kbobsoft.com                     [EMAIL PROTECTED]

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