Re: [BEHAVE] (no subject)
ivan c <ivan@cacaoweb.org> Thu, 27 June 2013 13:26 UTC
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To: Simon Perreault <simon.perreault@viagenie.ca>
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Date: Thu, 27 Jun 2013 15:27:04 +0200
From: ivan c <ivan@cacaoweb.org>
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References: <CB1B483277FEC94E9B58357040EE5D02325A6E93@xmb-rcd-x15.cisco.com> <2f7dce8264c8a9a72640629502a44295@cacaoweb.org> <51C1681A.5030909@viagenie.ca> <f8741fad1af1cee094de9c59408b7425@cacaoweb.org> <51C40374.8080403@viagenie.ca> <21e25b7ae1501228a67656b2fa4bc009@cacaoweb.org> <51CAA20F.4070307@viagenie.ca> <88c0ada2b8ebad078fb249ac6572fd8b@cacaoweb.org> <51CBD188.4060408@viagenie.ca> <fc3c7389e9fc7afc9201f0516de436a7@cacaoweb.org> <51CC2ED4.7090506@viagenie.ca>
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Subject: Re: [BEHAVE] (no subject)
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On Thu, 27 Jun 2013 14:23:48 +0200, Simon Perreault <simon.perreault@viagenie.ca> wrote: > Le 2013-06-27 13:29, ivan c a écrit : >>> s1 = socket(..., SOCK_DGRAM, ...); >>> s2 = socket(..., SOCK_DGRAM, ...); >>> connect(s1, ...); >>> connect(s2, ...); >>> >>> The kernel is free to use the same local endpoint for those two sockets >>> as long as the remote endpoint is different. >>> >>> If you really want to force reusing the same local endpoint, you do the >>> SO_REUSEADDR+bind() dance before calling connect(). >> >> Your pseudo-code will never bind the sockets on the same local endpoint. >> It is forbidden POSIX behavior. > > I'm ready to accept that, with a proper citation. Without the option SO_REUSEADDR, this is forbidden POSIX behavior >> The option SO_REUSEADDR won't help either, this option is used to bind >> over an *already closed* socket in TIME_WAIT state, that's all. > > I humbly believe that you are mistaken. It works, try it. It surely *works* on platforms that support this use of SO_REUSEADDR, we discussed it numerous times already, including on the phone. I also made the point in numerous posts already that SO_REUSEADDR is used to bypass the TIME_WAIT state on closed sockets, and even this is not specified by POSIX. See http://www.ietf.org/mail-archive/web/behave/current/msg10876.html In another post, I explained that if you use SO_REUSEADDR on all your TCP sockets you expose them to the old duplicate problem, and the worst is that this crosses applications boundaries. See http://www.ietf.org/mail-archive/web/behave/current/msg10906.html However, applications should be free to use it if they wish. I also made the point numerous times that applications should have as many ways as possible to cross NATs. -- _Ivan Chollet_
- Re: [BEHAVE] (no subject) Senthil Sivakumar (ssenthil)
- Re: [BEHAVE] (no subject) Dan Wing
- [BEHAVE] REQ 1 and REQ 7 of RFC5382 were supposed… ivan c
- Re: [BEHAVE] REQ 1 and REQ 7 of RFC5382 were supp… Simon Perreault
- Re: [BEHAVE] REQ 1 and REQ 7 of RFC5382 were supp… ivan c
- Re: [BEHAVE] REQ 1 and REQ 7 of RFC5382 were supp… Simon Perreault
- Re: [BEHAVE] REQ 1 and REQ 7 of RFC5382 were supp… Senthil Sivakumar (ssenthil)
- Re: [BEHAVE] REQ 1 and REQ 7 of RFC5382 were supp… ivan c
- Re: [BEHAVE] (no subject) ivan c
- Re: [BEHAVE] (no subject) Senthil Sivakumar (ssenthil)
- Re: [BEHAVE] (no subject) ivan c
- Re: [BEHAVE] (no subject) Rajiv Asati (rajiva)
- Re: [BEHAVE] (no subject) ivan c
- Re: [BEHAVE] (no subject) Simon Perreault
- Re: [BEHAVE] (no subject) Dan Wing
- Re: [BEHAVE] (no subject) ivan c
- Re: [BEHAVE] TCP port overloading, preservation a… ivan c
- Re: [BEHAVE] (no subject) ivan c
- Re: [BEHAVE] (no subject) Simon Perreault
- Re: [BEHAVE] TCP port overloading, preservation a… Simon Perreault
- Re: [BEHAVE] (no subject) ivan c
- Re: [BEHAVE] (no subject) ivan c
- Re: [BEHAVE] TCP port overloading, preservation a… ivan c
- Re: [BEHAVE] (no subject) Simon Perreault
- Re: [BEHAVE] TCP port overloading, preservation a… Simon Perreault
- Re: [BEHAVE] (no subject) ivan c
- Re: [BEHAVE] (no subject) cb.list6
- Re: [BEHAVE] (no subject) Simon Perreault
- Re: [BEHAVE] (no subject) Simon Perreault
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- Re: [BEHAVE] (no subject) ivan c
- Re: [BEHAVE] (no subject) Simon Perreault
- Re: [BEHAVE] (no subject) ivan c
- Re: [BEHAVE] (no subject) ivan c
- Re: [BEHAVE] (no subject) Simon Perreault
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- Re: [BEHAVE] (no subject) Simon Perreault
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- Re: [BEHAVE] DNS vs port overloading Simon Perreault
- Re: [BEHAVE] (no subject) ivan c
- Re: [BEHAVE] (no subject) Simon Perreault
- Re: [BEHAVE] (no subject) ivan c
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- Re: [BEHAVE] (no subject) Simon Perreault
- Re: [BEHAVE] (no subject) ivan c
- Re: [BEHAVE] (no subject) ivan c
- Re: [BEHAVE] DNS vs port overloading Mark Andrews
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- Re: [BEHAVE] (no subject) Simon Perreault
- Re: [BEHAVE] DNS vs port overloading Simon Perreault
- [BEHAVE] UDP socket programming Simon Perreault
- Re: [BEHAVE] TCP port overloading, preservation a… ivan c
- Re: [BEHAVE] DNS vs port overloading ivan c