Re: [v4tov6transition] IPv6 VPNs configured over 1280 MTU tunnels
"Templin, Fred L" <Fred.L.Templin@boeing.com> Mon, 11 October 2010 16:41 UTC
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From: "Templin, Fred L" <Fred.L.Templin@boeing.com>
To: Rémi Després <remi.despres@free.fr>, Washam Fan <washam.fan@gmail.com>
Date: Mon, 11 Oct 2010 09:42:18 -0700
Thread-Topic: [v4tov6transition] IPv6 VPNs configured over 1280 MTU tunnels
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Cc: Softwires <softwires@ietf.org>, "v4tov6transition@ietf.org" <v4tov6transition@ietf.org>
Subject: Re: [v4tov6transition] IPv6 VPNs configured over 1280 MTU tunnels
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> -----Original Message----- > From: Rémi Després [mailto:remi.despres@free.fr] > Sent: Monday, October 11, 2010 9:29 AM > To: Washam Fan; Templin, Fred L > Cc: Softwires; v4tov6transition@ietf.org > Subject: Re: [v4tov6transition] IPv6 VPNs configured over > 1280 MTU tunnels > > Hi Washam and Fred, > > Le 9 oct. 2010 à 05:02, Washam Fan a écrit : > > ... > > For this bullet in sec5, draft-despres-softwire-6a44-00 > > > > o 6a44 Server functions refuse packets received from their IPv6 > > pseudo interfaces if their sizes exceed 1280 octets, > with ICMPv6 > > Packet Too Big messages returned to sources as required by > > [RFC2460].) > > > > I think it could only apply to the case where the received IPv6 > > packets forwarded to the external domain. In the case the > 6a44 server > > does the hairpinning, the 6a44 server would refuse packets > whose size > > exceed (IPv4 MTU - 28) octets, with ptb ICMPv6 msg. > > ... > > > >>> -----Original Message----- > >>> From: v4tov6transition-bounces@ietf.org > >>> [mailto:v4tov6transition-bounces@ietf.org] On Behalf Of > >>> Templin, Fred L > >>> ... > >>> More to this point about double-tunneling, how were > >>> folks thinking that IPv6 VPNs would be run over a > >>> 1280 MTU IPv6-in-IPv4 tunnel? That is double-tunneling, > >>> and seems like it would be a quite common case, but the > >>> MTU seems deficient. Should it use IPv6 fragmentation? > >>> ... > > Actually, the 6a44 specification should, instead of 1280, > require IPv4 MTU - 28 octets, both for hairpinning and > traversal cases. How can you be sure that IPv4 PMTUD will work in the traversal case? Fred > (It is only hosts that should better take 1280 as default MTU > if not having reliable PMTU discovery.) > I will check with co-authors to fix it in a later version. > > Thanks to both of you for the discussion. > RD > > >
- [v4tov6transition] ISP support of Native IPv6 acr… Rémi Després
- Re: [v4tov6transition] [Softwires] ISP support of… Brian E Carpenter
- Re: [v4tov6transition] [Softwires] ISP support of… Ole Troan
- Re: [v4tov6transition] [Softwires] ISP support of… Brian E Carpenter
- Re: [v4tov6transition] [Softwires] ISP support of… Templin, Fred L
- Re: [v4tov6transition] [Softwires] ISP support of… Yiu L. Lee
- Re: [v4tov6transition] [Softwires] ISP support of… Yiu L. Lee
- Re: [v4tov6transition] [Softwires] ISP support of… Rémi Després
- Re: [v4tov6transition] [Softwires] ISP support of… Ole Troan
- Re: [v4tov6transition] [Softwires] ISP support of… Yiu L. Lee
- Re: [v4tov6transition] [Softwires] ISP support of… Rémi Després
- Re: [v4tov6transition] [Softwires] ISP support of… Rémi Després
- Re: [v4tov6transition] [Softwires] ISP support of… Templin, Fred L
- Re: [v4tov6transition] [Softwires] ISP support of… Ole Troan
- Re: [v4tov6transition] [Softwires] ISP support of… Brian E Carpenter
- Re: [v4tov6transition] [Softwires] ISP support of… Brian E Carpenter
- Re: [v4tov6transition] [Softwires] ISP support of… Brian E Carpenter
- Re: [v4tov6transition] [Softwires] ISP support of… Olivier Vautrin
- Re: [v4tov6transition] [Softwires] ISP support of… Cameron Byrne
- Re: [v4tov6transition] [Softwires] ISP support of… Ed Jankiewicz
- Re: [v4tov6transition] [Softwires] ISP support of… Rémi Després
- Re: [v4tov6transition] [Softwires] ISP support of… Ole Troan
- Re: [v4tov6transition] [Softwires] ISP support of… Rémi Després
- Re: [v4tov6transition] [Softwires] ISP support of… Templin, Fred L
- [v4tov6transition] IPv6 VPNs configured over 1280… Templin, Fred L
- Re: [v4tov6transition] IPv6 VPNs configured over … Templin, Fred L
- Re: [v4tov6transition] [Softwires] ISP support of… Yiu L. Lee
- Re: [v4tov6transition] [Softwires] ISP support of… Templin, Fred L
- Re: [v4tov6transition] [Softwires] ISP support of… Yiu L. Lee
- Re: [v4tov6transition] [Softwires] ISP support of… Templin, Fred L
- Re: [v4tov6transition] [Softwires] ISP support of… Yiu L. Lee
- Re: [v4tov6transition] IPv6 VPNs configured over … Washam Fan
- Re: [v4tov6transition] ISP support of Native IPv6… Tina TSOU
- Re: [v4tov6transition] ISP support of Native IPv6… Brian E Carpenter
- Re: [v4tov6transition] IPv6 VPNs configured over … Templin, Fred L
- Re: [v4tov6transition] IPv6 VPNs configured over … Rémi Després
- Re: [v4tov6transition] IPv6 VPNs configured over … Templin, Fred L
- Re: [v4tov6transition] IPv6 VPNs configured over … Rémi Després
- Re: [v4tov6transition] IPv6 VPNs configured over … Templin, Fred L
- Re: [v4tov6transition] [Softwires] IPv6 VPNs conf… Templin, Fred L
- Re: [v4tov6transition] [Softwires] IPv6 VPNs conf… Brian E Carpenter
- Re: [v4tov6transition] [Softwires] IPv6 VPNs conf… Templin, Fred L
- Re: [v4tov6transition] IPv6 VPNs configured over … Washam Fan
- Re: [v4tov6transition] IPv6 VPNs configured over … Templin, Fred L
- Re: [v4tov6transition] IPv6 VPNs configured over … Washam Fan
- Re: [v4tov6transition] [Softwires] 6a44 MTU issues Rémi Després
- Re: [v4tov6transition] IPv6 VPNs configured over … Templin, Fred L
- Re: [v4tov6transition] [Softwires] 6a44 MTU issues Templin, Fred L
- Re: [v4tov6transition] [Softwires] 6a44 MTU issues Rémi Després
- Re: [v4tov6transition] [Softwires] 6a44 MTU issues Templin, Fred L
- Re: [v4tov6transition] [Softwires] 6a44 MTU issues Rémi Després
- Re: [v4tov6transition] IPv6 VPNs configured over … Washam Fan
- Re: [v4tov6transition] [Softwires] 6a44 MTU issues Templin, Fred L
- Re: [v4tov6transition] IPv6 VPNs configured over … Templin, Fred L
- Re: [v4tov6transition] IPv6 VPNs configured over … Brian E Carpenter
- Re: [v4tov6transition] IPv6 VPNs configured over … Templin, Fred L