Re: [BEHAVE] (no subject)
ivan c <ivan@cacaoweb.org> Thu, 27 June 2013 16:46 UTC
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To: Simon Perreault <simon.perreault@viagenie.ca>
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Date: Thu, 27 Jun 2013 18:46:59 +0200
From: ivan c <ivan@cacaoweb.org>
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Subject: Re: [BEHAVE] (no subject)
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On Thu, 27 Jun 2013 17:59:00 +0200, Simon Perreault <simon.perreault@viagenie.ca> wrote: > Le 2013-06-27 17:29, ivan c a écrit : >>> We know that port overloading is desirable for a number of reasons. >>> What we need to argue is why the undesirable effects of port overloading >>> do not apply or can be ignored. >> >> Definitely, this is the main point of our argument. >> I think we have progressed in this argument and provided useful material. >> In this post: >> http://www.ietf.org/mail-archive/web/behave/current/msg10896.html , I >> explain (among other things), why the TCP Hole Punching Protocol is not >> affected by the rare cases of collision due to port overloading. The >> application simply retries with a new TCP socket (on a new local >> endpoint). > > ...as long as the NAT does port preservation, right? > No, I meant it in the general case with port overloading, with or without TCP port preservation. As you know, port overloading breaks the EIM requirement in the general case. This is why port overloading is a MUST NOT in the existing RFCs. But since collisions are supposed to be rare, p2p application can simply retry with a new socket (on a new local endpoint) if the NAT happened to refuse or drop a packet. > If so, the problem I see is that CGNs do not / can not / will not do > port preservation, as a few people already pointed out. Sure, regarding port preservation, on very busy CGNs it will surely not be granted all the time. But they are free to use the port allocation scheme they like. As you say, I assume a lot of CGNs won't support it. Port preservation should probably be an optional feature (especially for home NATs, that generally already have it). It is not necessarily related to port overloading. Port overloading, i feel, should probably be an optional feature too, since it is used in the wild and has limited impact on TCP Hole Punching. I'm not a NAT implementer though and thus my voice is not the most important here, as I see it as a NAT only feature that doesn't seriously affect p2p applications. Hope this helps clarifying the point. -- _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
- 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