Re: [v4v6interim] Fragmentation Options in NAT6 presentation
Brian E Carpenter <brian.e.carpenter@gmail.com> Tue, 07 October 2008 21:00 UTC
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Date: Wed, 08 Oct 2008 10:00:56 +1300
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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To: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
References: <B2FE551A-5BA9-4D46-B619-EF694015D5AF@tahi.org> <48E6AEBD.9090205@gmail.com> <BB56240F3A190F469C52A57138047A03011DB57C@xmb-rtp-211.amer.cisco.com> <200810071047.56810.remi.denis-courmont@nokia.com>
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Cc: v4v6interim@ietf.org
Subject: Re: [v4v6interim] Fragmentation Options in NAT6 presentation
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On 2008-10-07 20:47, Rémi Denis-Courmont wrote: > On Monday 06 October 2008 19:34:51 ext Wes Beebee (wbeebee), you wrote: >> I do agree that RFC 4821 is the right solution, and should be used in >> recommendations in IETF documents. >> >> However, how many stacks actually implement RFC 4821? > > There are really two separate categories: > > For TCP (and SCTP), this needs to be supported by the IP stack. The widespread > use of TCP MSS clamping makes it obvious that many if not most IP stacks do > not support this as yet. > > For UDP, this needs to be implemented directly into the application-layer, > with some additional support from the IP stack (to allow sending too large > packets with DF bit). As yet, Linux is the only IP stack that explicitly > supports this via some "proprietary" socket API options. As for applications, > it is difficult to gather meaningful data. But considering the lack of > support from lower layers, it is likely that this is mostly not implemented. > I empirically believe that most applications simply have a "safe" hard-coded > MTU for UDP, e.g. 1400 bytes or whatever. In any case, I assume we have to wait at least 5 years before the RFC4821 approach is widely deployed. But since the problem of MTU size and ICMP blocking is widespread, I think we should recognise that it isn't specific to the NAT6[4] scenarios, and that the solution needs to be general. Brian _______________________________________________ v4v6interim mailing list v4v6interim@ietf.org https://www.ietf.org/mailman/listinfo/v4v6interim
- [v4v6interim] Fragmentation Options in NAT6 prese… Hiroshi MIYATA
- Re: [v4v6interim] Fragmentation Options in NAT6 p… Wes Beebee (wbeebee)
- Re: [v4v6interim] Fragmentation Options in NAT6 p… Eric Vyncke (evyncke)
- Re: [v4v6interim] Fragmentation Options in NAT6 p… Hiroshi MIYATA
- Re: [v4v6interim] Fragmentation Options in NAT6 p… Brian E Carpenter
- Re: [v4v6interim] Fragmentation Options in NAT6 p… Hiroshi MIYATA
- Re: [v4v6interim] Fragmentation Options in NAT6 p… Wes Beebee (wbeebee)
- Re: [v4v6interim] Fragmentation Options in NAT6 p… Eric Vyncke (evyncke)
- Re: [v4v6interim] Fragmentation Options in NAT6 p… Fred Baker
- Re: [v4v6interim] Fragmentation Options in NAT6 p… Rémi Denis-Courmont
- Re: [v4v6interim] Fragmentation Options in NAT6 p… Brian E Carpenter
- Re: [v4v6interim] Fragmentation Options in NAT6 p… Mark Andrews
- Re: [v4v6interim] Fragmentation Options in NAT6 p… Dan Wing
- Re: [v4v6interim] Fragmentation Options in NAT6 p… Magnus Westerlund
- Re: [v4v6interim] Fragmentation Options in NAT6 p… Brian E Carpenter
- Re: [v4v6interim] Fragmentation Options in NAT6 p… Rémi Denis-Courmont
- Re: [v4v6interim] Fragmentation Options in NAT6 p… Iljitsch van Beijnum
- Re: [v4v6interim] Fragmentation Options in NAT6 p… Eric Vyncke (evyncke)