RE: [RRG] MTU/fragmentation AGAIN

["Templin, Fred L" <Fred.L.Templin@boeing.com>]

Brian,

> -----Original Message-----
> From: Brian Dickson [mailto:briand@ca.afilias.info] 
> Sent: Wednesday, January 02, 2008 5:30 PM
> To: Templin, Fred L
> Cc: Iljitsch van Beijnum; Routing Research Group list; Dino 
> Farinacci; Tony Li
> Subject: Re: [RRG] MTU/fragmentation AGAIN
...
> The real benefit is that, like SIIT, it is feasible to do ICMP 
> transliteration, thus support PMTUD and similar activities.
> That, and not affecting the PMTU itself in the first place. :-)

Among the myriad issues that have us scratching our heads,
SIIT doesn't work when a middlebox returns an ICMP PTB that
only includes the minimum 8 bytes beyond the IP header of
the packet-in-error. FWIW, net/ipv6/sit.c in the Linux
kernel distro has the following to say about SIIT:

+ #ifndef I_WISH_WORLD_WERE_PERFECT
+ 
+ /* It is not :-( All the routers (except for Linux) return only
+    8 bytes of packet payload. It means, that precise relaying of
+    ICMP in the real Internet is absolutely infeasible.
+ */

Fred
fred.l.templin@boeing.com

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