google path mtu?

[Brielle Bruns]

On 1/19/15 5:52 AM, Artem Viklenko wrote:
> 19.01.2015 13:12, Mikael Abrahamsson написав(ла):
>> On Mon, 19 Jan 2015, Ignatios Souvatzis wrote:
>>
>>> I had some problems at home, which is not tunneled, but a
>>> less-than-1500-octet-mtu PPPoE DSL line, so - thinking it's tunnels
>>> only ignores an increasing number of native private users.
>>
>> Well, PPPoE is a tunnel, but I guess that's splitting hairs.
>>
>> But regardless, I had trouble this morning with Youtube that might be
>> related to the same issue.
>>
>
>
> One possible solution to force TCP MSS. For example on my FreeBSD
> router at home i used PF's scrub rule for ipv6 tunnel to set
> mss to 1220 bytes.
>
> If you use PPPoE as underlying technology, decrease this vale little
> bit more - 1212 or less.
>
>
>

Min MTU size allowable for ipv6 is 1280 according to RFC.  Wouldn't 
setting the MSS size to 1212 or 1220 essentially break that RFC as well 
(1220+40 < 1280) or does the RFC only explicitly state the MTU has to be 
at least 1280?


-- 
Brielle Bruns
The Summit Open Source Development Group
http://www.sosdg.org    /     http://www.ahbl.org