Thanks to everyone who has answered this. You've cleared up things a great deal for me.



Jim C.

Vox wrote:
This time Jim C <[EMAIL PROTECTED]> becomes daring and writes:


The -l just lists ports that are in the act of listening, whereas active
connections are listed separately. For instance, if you have another
computer on your home network (B), ssh from B to A. Then on A, list all the
TCP connections with a netstat -at. The listening ports (including ssh)
will show a foreign address of as above, and listed separately below in
the active connections you'll see your ssh connection from B to A.

OK, but a potential connection (i.e. listenting) from Local address 0.0.0.0:[arbitrary port number] to foreign address 0.0.0.0:[arbitrary port number] represents a possible connection between what IP's? So far, I have to assume that it is either any IP or no IP.


0.0.0.0 = any

On TCP/IP networking, 0 as any octet of an IP is, for all purposes,
a universal globing. That's why I hate people who set their LANs to
use 192.168.0.x as their IPs...it drives me crazy, even if it's
valid :)


Vox





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