Date: Sun, 13 Jun 1999 11:01:26 -0400 (EDT) From: Brian Feldman <green@unixhelp.org> To: Dag-Erling Smorgrav <des@flood.ping.uio.no> Cc: hackers@FreeBSD.ORG Subject: Re: select(2) breakage Message-ID: <Pine.BSF.4.10.9906131100140.26380-100000@janus.syracuse.net> In-Reply-To: <xzpu2scxs3t.fsf@flood.ping.uio.no>
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On 13 Jun 1999, Dag-Erling Smorgrav wrote:
> Brian Feldman <green@unixhelp.org> writes:
> > Another problem that came up with this: I originally started at port 1024.
> > I monopolized 30000 ports (almost all consecutive, of course). When I try to
> > connect() a TCP socket as non-root, it fails with EAGAIN (I only tracked it
> > far enough down as in_pcbbind().) It seems that eventually it gives up trying
> > to find a port... :-/
>
> What kind of connects are you doing? If you try to connect all your
> sockets to the same destination,port tuple you'll quickly run out of
> source ports, since there are only a little less than 4,000 ports
> available:
>
> des@des ~% sysctl -A | grep portrange
> net.inet.ip.portrange.lowfirst: 1023
> net.inet.ip.portrange.lowlast: 600
> net.inet.ip.portrange.first: 1024
> net.inet.ip.portrange.last: 5000
> net.inet.ip.portrange.hifirst: 49152
> net.inet.ip.portrange.hilast: 65535
>
> connect() normally uses the 1024-5000 range. Try the following:
>
> # sysctl -w net.inet.ip.portrange.last=40000
>
> and see if it solves the EAGAIN problem.
Actually, this is the perfect explanation. I think that this should go in
the FAQ. Why in the world are we limiting the ports we can use other than
from 1-1023?
>
> DES
> --
> Dag-Erling Smorgrav - des@flood.ping.uio.no
>
>
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