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>   0.0.0.0 = any

Further to this, if you see a service listening on 0.0.0.0, it actually means the 
service is listening on all available (and future) interfaces.

tcp        0      0 0.0.0.0:631             0.0.0.0:*               LISTEN
tcp        0      0 127.0.0.1:5432          0.0.0.0:*               LISTEN

Here, I have something listening on port 631 (cups) on all interfaces, and something 
listening only on localhost (postgres)
Since both services are listening and have no connection, neither of them have a 
foreign address listed (hence the 0.0.0.0 in the second address field).

tcp        0      0 128.98.x.x:34445     128.98.z.z:22         ESTABLISHED
tcp        1      0 128.98.x.x:35738     128.98.y.y:3125        CLOSE_WAIT

Here, I have an established connection made to a server on port 22 (ssh) and another 
waiting for a timeout.

- -- 
Mark Watts
Systems Engineer
QinetiQ TIM
St Andrews Road, Malvern
GPG Public Key available on request.
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