Re: [BEHAVE] (no subject)
Simon Perreault <simon.perreault@viagenie.ca> Thu, 27 June 2013 14:29 UTC
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Date: Thu, 27 Jun 2013 16:29:11 +0200
From: Simon Perreault <simon.perreault@viagenie.ca>
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Cc: behave@ietf.org
Subject: Re: [BEHAVE] (no subject)
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Le 2013-06-27 16:17, ivan c a écrit : >> My point is that UDP and TCP are not different from the point of view of >> the NAT w.r.t. port preservation, since applications routinely call >> connect() on UDP sockets and it is entirely possible that two UDP >> sockets share the same local endpoint. POSIX standards have nothing to >> do with it. > > It has everything to do with POSIX standards. Options that are outside the > POSIX standards are usually quite flaky. See the shortcomings of the > SO_REUSEADDR option that I mention in my previous post. > I also totally agree that: UDP and TCP are not different from the point of > view of the NAT w.r.t. port overloading (i assume you meant port > overloading, you wrote "port preservation") No, I meant port preservation. I'm having a hard time following, and I thought that the UDP-vs-TCP distinction was w.r.t. port preservation. > It's just that applications usually use many more TCP local endpoints than > UDP ones. See bittorrent and all others, empirical observations. So if > there is a shortage of internal endpoints, it's more likely to happen for > TCP. But it can also happen for UDP, i totally agree. Fully agree. >> The functionality is available on many (all?) platforms, and >> applications use it. > > Which applications use it for TCP? Reference needed. By "it", I was referring to "the ability to open multiple sockets bound to the same client endpoint". With TCP, applications do it by default. > SO_REUSEADDR is not needed on UDP anyway since you can already multiplex > multiple sessions over the same UDP socket. Applications can still use it > for pure convenience though, i agree, your previous post being a nice > illustration of this use case. Exactly. My point is that UDP applications do sometimes create 5-tuples sharing the same local 3-tuple. Empirically we see that it is a minority of the traffic, but the functionality is there, is being used, and needs to be considered in the recommendations for NAT that we end up writing. Simon
- 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
- Re: [BEHAVE] (no subject) Reinaldo Penno (repenno)
- 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
- Re: [BEHAVE] (no subject) Simon Perreault
- Re: [BEHAVE] (no subject) Mark Andrews
- Re: [BEHAVE] (no subject) ivan c
- [BEHAVE] DNS vs port overloading Simon Perreault
- Re: [BEHAVE] (no subject) ietfdbh
- Re: [BEHAVE] (no subject) Simon Perreault
- Re: [BEHAVE] DNS vs port overloading Mark Andrews
- 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
- Re: [BEHAVE] (no subject) Tom Taylor
- 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
- Re: [BEHAVE] (no subject) ivan c
- 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