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-boun...@ietf.org [mailto:ipv6-boun...@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 <rbon...@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 <j...@apple.com>
> core os networking
>
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