[AusNOG] PMTUD was -> RE: GRE Tunnel MTU suggestions

[Alex Samad - Yieldbroker]

> -----Original Message-----
> From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of
> Mark ZZZ Smith
> Sent: Tuesday, 1 July 2014 6:20 PM
> To: Joseph Goldman; AusNOG at lists.ausnog.net
> Subject: Re: [AusNOG] GRE Tunnel MTU suggestions
> 
> 
> 
> 
> 
> ----- Original Message -----
> > From: Joseph Goldman <joe at apcs.com.au>
> > To: "AusNOG at lists.ausnog.net" <AusNOG at lists.ausnog.net>
> > Cc:
> > Sent: Tuesday, 1 July 2014 4:56 PM
> > Subject: [AusNOG] GRE Tunnel MTU suggestions
> >
> > Hi List,
> >
{snip}
> 
> PMTUD is better to use, MSS adjusting is a TCP specific hack. Don't switch it
> on unless you need to because PMTUD is broken.
>


How broken is PMTUD now, I remember back in the day diagnosing a lot of DSL connection that failed because of this.


{snip}