Re: draft-wbeebee-ipv6-cpe-router-04 comments

[Iljitsch van Beijnum <iljitsch@muada.com>]

On 20 jul 2009, at 21:06, Mikael Abrahamsson wrote:

> > Brokenness comes from people filtering ICMP but still having PMTUD  
> > enabled.

> That is still not true, at least not at the ISP level. There are NAT/ 
> load balancers which do not handle PMTUD properly even if all ICMP  
> is allowed, and ICMP messages won't be generated when there are MTU  
> mismatches.

That's no excuse. You can easily turn off PMTUD or have too bigs  
generated elsewhere in the network, PMTUD black holes are 100%  
avoidable.