From: Octavian Purdila <opurdila@ixiacom.com>
To: Bill Fink <billfink@mindspring.com>
Cc: Eric Dumazet <dada1@cosmosbay.com>, netdev@vger.kernel.org
Subject: Re: ports beeing reused too fast
Date: Sat, 9 May 2009 22:41:41 +0300 [thread overview]
Message-ID: <200905092241.41515.opurdila@ixiacom.com> (raw)
In-Reply-To: <20090509153135.04874f72.billfink@mindspring.com>
On Saturday 09 May 2009 22:31:35 Bill Fink wrote:
> > Normally, the client machine should not reuse a port during the TIME_WAIT
> > duration (TCP_TIMEWAIT_LEN being 60 seconds on linux). Port selection
> > being random or sequential, it should avoid all ports recently used.
> >
> > Maybe this firewall has a longer TIME_WAIT enforcement (something like 2
> > minutes)
>
> But he had 19 ports being reused after only 1000 connect()s, which
> with his stated ~360 (I'm assuming per second) connection rate,
> would only take about 3 seconds.
>
Time-wait doesn't apply in this case, because connections are closed by the
server, thus they don't have to go through the time-wait state.
Thanks,
tavi
next prev parent reply other threads:[~2009-05-09 19:42 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-08 20:11 ports beeing reused too fast Octavian Purdila
2009-05-09 6:58 ` Eric Dumazet
2009-05-09 13:11 ` Octavian Purdila
2009-05-09 15:17 ` Eric Dumazet
2009-05-09 16:16 ` Eric Dumazet
2009-05-09 19:31 ` Bill Fink
2009-05-09 19:41 ` Octavian Purdila [this message]
2009-05-09 22:45 ` Stephen Hemminger
2009-05-12 12:32 ` Octavian Purdila
2009-05-12 15:11 ` Stephen Hemminger
2009-05-12 15:52 ` Octavian Purdila
2009-05-14 20:29 ` Stephen Hemminger
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