[95951] in North American Network Operators' Group

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Thoughts on increasing MTUs on the internet

daemon@ATHENA.MIT.EDU (Iljitsch van Beijnum)
Thu Apr 12 05:26:53 2007

To: NANOG list <nanog@merit.edu>
From: Iljitsch van Beijnum <iljitsch@muada.com>
Date: Thu, 12 Apr 2007 11:20:18 +0200
Errors-To: owner-nanog@merit.edu


Dear NANOGers,

It irks me that today, the effective MTU of the internet is 1500  
bytes, while more and more equipment can handle bigger packets.

What do you guys think about a mechanism that allows hosts and  
routers on a subnet to automatically discover the MTU they can use  
towards other systems on the same subnet, so that:

1. It's no longer necessary to limit the subnet MTU to that of the  
least capable system

2. It's no longer necessary to manage 1500 byte+ MTUs manually

Any additional issues that such a mechanism would have to address?

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