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From: brian@shift.utell.net (Brian Somers)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: Listening at a socket
Date: 20 Jun 1997 09:44:38 GMT
Organization: Awfulhak Ltd.
Lines: 27
Message-ID: <5odje6$bb6@ui-gate.utell.co.uk>
References: <5oblqi$4re@ui-gate.utell.co.uk>
Reply-To: brian@awfulhak.org, brian@utell.co.uk
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In article <5oblqi$4re@ui-gate.utell.co.uk>,
brian@shift.utell.net (Brian Somers) writes:
> This *has* to be a dumb question, but can anyone tell me
> how an OS, once it's received a packet for a given port
> X, can distinguish which process of all the processes that
> are using that port should get that packet.
>
> For example, if I run an ftp server, I have my ftpd
> listening on *.21. If I currently have 2 established
> connections from the same remote machine, I'll have two
> additional ftpd processes running (forked from the first).
> When a packet is received from the other machine destined
> for port 21, how does the OS decide which process to deliver
> the packet to ?
>
> TIA.
Thanks for all the replies (here & via email). I was overlooking
the fact that the source port & IP are relevent for TCP
"established" packets.
I knew it was a dump question :-)
--
Brian <brian@awfulhak.org> <brian@freebsd.org>
<http://www.awfulhak.org>
Don't _EVER_ lose your sense of humour !