IPv6 and Jumbo Frames

Joe Abley jabley at hopcount.ca
Tue Apr 7 16:55:33 CEST 2009

On 7-Apr-2009, at 07:23, Bernhard Schmidt wrote:

> we're just about to get a second 10GE connection to the german NREN  
> and
> are considering to use Jumbo frames on this link (around 9000 Bytes).
> Does anyone have any experience how "jumbo-safe" the current IPv6
> networks are (read: how many networks break pMTU-discovery but at  
> least
> do 1500 bytes through the whole path)?

I have never had problems with 1280-byte MTU (proto-41-in-IP tunnel)  
or 1492-byte MTU (PPPoE) links. This suggests to me that PMTUd tends  
to work in the v6 Internet. That's not very scientific though :-)


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