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Re: [v6ops] LAN vs WAN MTUs (was new draft: draft-byrne-v6ops-64share)

"Templin, Fred L" <Fred.L.Templin@boeing.com> Mon, 01 October 2012 15:59 UTC

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From: "Templin, Fred L" <Fred.L.Templin@boeing.com>
To: Rémi Després <despres.remi@laposte.net>, Daniel Roesen <dr@cluenet.de>, Mikael Abrahamsson <swmike@swm.pp.se>
Date: Mon, 01 Oct 2012 08:59:22 -0700
Thread-Topic: [v6ops] LAN vs WAN MTUs (was new draft: draft-byrne-v6ops-64share)
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References: <201209291245.q8TCj0P22972@ftpeng-update.cisco.com> <alpine.DEB.2.00.1209291932550.13902@uplift.swm.pp.se> <CAD6AjGT_V05m8fU-cUfFKhPHvyrgiJihQoS_bF-j-w3XLgBEcQ@mail.gmail.com> <97EB7536A2B2C549846804BBF3FD47E11184A36D@xmb-aln-x02.cisco.com> <CAD6AjGRNHHqrj8R7-gkMAsC11B+AQOoZOV4jH4kTHXBFcDBsiA@mail.gmail.com> <20121001000808.GB25686@srv03.cluenet.de> <CAKD1Yr2ds8tZTou-pZ+oQJ8yeOt5g432s7h5LsFoFs9iz5_K8Q@mail.gmail.com> <20121001095516.GA9562@srv03.cluenet.de> <alpine.DEB.2.00.1210011219350.13902@uplift.swm.pp.se> <15E22D4F-CC95-45BD-9437-898E3A0862DF@laposte.net>
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Cc: v6ops WG <v6ops@ietf.org>
Subject: Re: [v6ops] LAN vs WAN MTUs (was new draft: draft-byrne-v6ops-64share)
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> -----Original Message-----
> From: v6ops-bounces@ietf.org [mailto:v6ops-bounces@ietf.org] On Behalf Of
> Rémi Després
> Sent: Monday, October 01, 2012 6:34 AM
> To: Daniel Roesen; Mikael Abrahamsson
> Cc: v6ops WG
> Subject: Re: [v6ops] LAN vs WAN MTUs (was new draft: draft-byrne-v6ops-
> 64share)
> 
> Hi, Daniel, Mikael,
> 
> 2012-10-01 12:26, Mikael Abrahamsson :
> 
> > On Mon, 1 Oct 2012, Daniel Roesen wrote:
> > ...
> >> If you really care about delay, MSS clamping is an option which isn't
> intrusive to the LAN as it affects only connections via the mobile
> gateway.
> >
> > But it only helps TCP, not everything else.
> 
> Since it does help TCP and doesn't hurt anything, it's IMHO worth
> recommending.
> 
> FYI, something was proposed about this in May, ref. www.ietf.org/mail-
> archive/web/v6ops/current/msg13015.html, namely:
> "In any node, before entering of just after leaving a link whose MTU is
> the same in both directions (Ethernet, 6rd, DS-lite, ...), if the MSS
> advertised in a received TCP SYN packet exceeds the link MTU minus the
> TCP/IP header length (40 octets in IPv4, 60 in IPv6), reduce it to this
> value, and adjust IP and TCP checksums accordingly."
> 
> In principle, I can't any longer afford to be active in v6ops, but still
> look at some of the exchanged mails and may provide brief comments. Dan
> Wing is added as cc because he privately said in May he liked this
> proposed behavior.

The alternative of course is to fix tunnel MTU for good, as
specified here:

https://datatracker.ietf.org/doc/draft-generic-v6ops-tunmtu/
https://datatracker.ietf.org/doc/draft-generic-6man-tunfrag/
https://datatracker.ietf.org/doc/draft-templin-intarea-seal/

Thanks - Fred
fred.l.templin@boeing.com

> Regards,
> RD
> 
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