Test your connectivity for World IPv6 Day
tore.anderson at redpill-linpro.com
Tue Jun 7 15:56:49 CEST 2011
* Rémi Després
> Le 7 juin 2011 à 00:20, Tore Anderson a écrit :
>> It's quite hard to discover the blackholes (and by extension fix
>> them) if you're defaulting to 1280.
> Which blackholes? - With 1280, there isn't any related to MTU's.
Wrong. The blackholes are still there. Masking the symptoms does not fix
the underlying problem.
>> In any case, the few users that have HE/SixXS/etc. tunnels can take
>> care of themselves. If it breaks, they get to keep both parts.
> Too bad for IPv6!
>> For real deployments, on the other hand ... well, I'm hoping no
>> serious ISP or content provider will willingly put their end users
>> or web sites behind MTU-impaired links or tunnels. Recipe for
>> disaster if you ask me.
> What do you mean, precisely, by "MTU-impaired links or tunnels"?
If an ISP, a tunnel broker, or a concious tunnel-using end user are
using a link/tunnel that has a MTU lower than 1500 but where PMTUD does
not work reliably, that is their problem, not mine. I refuse to work
around their defective network by crippling the MTU for all my visitors.
What MTU do you recommend for IPv4 servers, by the way? 576 or 68?
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