[ntp:questions] Interface restrictions confusing me

Juergen Beisert juergen at kreuzholzen.de
Sun Oct 11 13:49:25 UTC 2009


On Samstag, 10. Oktober 2009, David Woolley wrote:
> Juergen Beisert wrote:
> > Why is port 123 open on eth0?
>
> To allow the replies to come back in from the time servers.  ntpd sends
> UDP packets with both source and destination set to 123, not just when
> talking to peers.

I'm not experiences with network programming: To connect a second host via 
network one must open a local port that also accepts connections from other 
hosts?

Regards,
Juergen




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