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RE: Meta-issues: On the deprecation of the fragmentation function

Ronald Bonica <rbonica@juniper.net> Wed, 10 July 2013 19:22 UTC

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From: Ronald Bonica <rbonica@juniper.net>
To: james woodyatt <jhw@apple.com>, "ipv6@ietf.org" <ipv6@ietf.org>
Subject: RE: Meta-issues: On the deprecation of the fragmentation function
Thread-Topic: Meta-issues: On the deprecation of the fragmentation function
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Date: Wed, 10 Jul 2013 19:21:30 +0000
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Hi James,

If ICMPv6 PTB messages are unreliable, fragmentation breaks just as badly as PMTUD.

At the risk of going off-topic, please take a look at draft-bonica-intarea-gre-mtu-02.

                                                 Ron


> -----Original Message-----
> From: ipv6-bounces@ietf.org [mailto:ipv6-bounces@ietf.org] On Behalf Of
> james woodyatt
> Sent: Wednesday, July 10, 2013 2:23 PM
> To: ipv6@ietf.org
> Subject: Re: Meta-issues: On the deprecation of the fragmentation
> function
> 
> On Jul 10, 2013, at 08:49 , Ronald Bonica <rbonica@juniper.net> wrote:
> > [...]
> > Probably, the best alternative is for the tunnel ingress router to
> tunnel ingress router to discover the PMTU to the egress. When the
> tunnel ingress router receives a packet that is so large that it cannot
> be forwarded through the tunnel, it discards the packet and sends an
> ICMP PTB to the packet's originator. The packet's originator then
> modifies its sending behavior based upon its new estimate of the PMTU
> associated with the destination.
> > [...]
> 
> ICMPv6 packet too big errors are unreliable on the real-world Internet.
> 
> I hate to sound like a broken record, but I will: I look forward to
> reviewing a proposal to update to Generic Packet Tunneling in IPv6 [RFC
> 2473] for implementing tunnel path MTU discovery at the encapsulation
> layer [c.f. RFC 4821].
> 
> 
> --
> james woodyatt <jhw@apple.com>
> core os networking
> 
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