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[Brian E Carpenter]

On 21/12/2012 08:24, Ignatios Souvatzis wrote:
> On Wed, Dec 19, 2012 at 11:22:58AM +0200, Sander Steffann wrote:
>> Hi,
>>
>>> Really? Can't you set the MTU to 1280? That should fix it.
>>
>> Although everybody on the internet could lower their MTU to 1280,
>> it would be easier if they properly send ICMP errors :-)
> 
> If everybody would lower their MTU to 1280, 

"everybody" in this context means hosts, not tunnel operators, who
should go as high as possible, of course. 1280 at the host allows
for a couple of encapsulations inside a physical 1500 limit.

    Brian

the known or hidden
> tunnels* would stop to work again. This is just like the professor
> who, noticing that the last row in the lecture hall would have a
> lot of mumbling students, ordered to remove that row of seats.
> 
> *) e.g., non-Deutsche-Telekom DSL bitstream-like accesses (which
> mostly travel through Deutsche Telekom last lines) are often carried
> from the DSLAM to the ISP's equipment over hidden tunnels. If those
> tunnels used an MTU of 1280 octets, the customer would see something
> like 1260 or 1240.
> 
> 	-is
> 
> 
>