Windows 2008R2 MTU reverts to default

[Dick Visser]

On 10 June 2013 22:48, Phil Pennock <ipv6-ops+phil at spodhuis.org> wrote:
> On 2013-06-10 at 14:57 +0200, Dick Visser wrote:
>> This works for a while, but after a minute or so it changes back to the default:
>
>> Any ideas what might be causing this?
>
> A thought, so only qualifies as "might", I don't know Windows to speak
> definitively, but ... IPv6 NDP Route Advertisement with the MTU option?
>
> Windows then updating the manually-configured value based upon learnt
> values on the wire?

Yup, this was the case. I watched it continuously, and when an RA came
in, it overwrote the manually configured MTU.
Next question: how do I prevent that from happening?


-- 
Dick Visser
System & Networking Engineer
TERENA Secretariat
Singel 468 D, 1017 AW Amsterdam
The Netherlands