Date: Fri, 20 Jan 2017 18:15:11 +0300 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: Julian Elischer <julian@freebsd.org> Cc: "freebsd-net@freebsd.org" <freebsd-net@FreeBSD.ORG>, Randall Stewart <rrs@freebsd.org>, Ermal =?utf-8?B?THXDp2k=?= <eri@freebsd.org> Subject: Re: all network people please review this proposal: because someone is going to commit it soon. D5017 Message-ID: <20170120151511.GR78888@zxy.spb.ru> In-Reply-To: <678042cf-9d5f-2f39-6689-30eadf4214a7@freebsd.org> References: <678042cf-9d5f-2f39-6689-30eadf4214a7@freebsd.org>
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On Fri, Jan 20, 2017 at 11:00:18PM +0800, Julian Elischer wrote: > Unless eri gets to it first I will. > > see https://reviews.freebsd.org/D5017 > > If you have a server, you can put an arbitrary number of clients on > the same port number because they all have different addresses. > > However in the case of a client accessing multiple servers we are > limited to 65535 sessions because we strictly don't allow the same > port to be used more than once. This is silly because TCP is a > symmetrical protocol and of it works for the server it should work for > the client. > > So this patch changes the allocation of ports to allow the client to > use a port that has been used before as long as the previous port user > is not talking to the same host/port. This removes the limitation of a > freebsd machine being only capable of contacting 65000 hosts in a > single port shutdown timeout period. With modern machines capable of > initiating MILLIONS of sessions per second, having a limitation of > 65000 per 2 minutes is a bit silly. > > > Please read the patch if you suspect this will have a bad effect of > any sort. Once the session is started there is no record as to who > started it so any issues would have to be in the startup phase. Good. Can you use also destination port and source IP in same way as destination address?
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