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[RAM] Re: Tunneling overheads and fragmentation

Stephane Bortzmeyer <bortzmeyer@nic.fr> Thu, 19 July 2007 16:01 UTC

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Date: Thu, 19 Jul 2007 18:01:25 +0200
From: Stephane Bortzmeyer <bortzmeyer@nic.fr>
To: Robin Whittle <rw@firstpr.com.au>
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Subject: [RAM] Re: Tunneling overheads and fragmentation
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On Fri, Jul 20, 2007 at 12:34:27AM +1000,
 Robin Whittle <rw@firstpr.com.au> wrote 
 a message of 54 lines which said:

> Can anyone help me understand the likely problems with tunneling
> packets and what MTU limits might be exceeded if LISP, eFIT-APT or
> Ivip is used with IPv4?

Executive summary: tunnels create a lot of problems (see the RFC
indicated by Fred Templin plus RFC 2923).

> For instance, if all provider and transit routers happily handle
> packets significantly longer than whatever hosts normally produce
> (say 1500 bytes) then adding the encapsulation won't lead to any
> fragmentation.  Is this a reasonable assumption?

I do not think so.
 

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