[ILUG] Linux Router + DSL

[Thomas Bridge]

On Fri, Oct 15, 2004 at 12:34:08AM +0100, Paul Jakma wrote:
> On Fri, 15 Oct 2004, Conall O'Brien wrote:
> 
> >Oct 14 23:46:24 gonzo pppd[24357]: Couldn't increase MTU to 1500
> >Oct 14 23:46:24 gonzo pppd[24357]: Couldn't increase MRU to 1500
> >Oct 14 23:46:30 gonzo pppd[24357]: Connection terminated.
> >Oct 14 23:46:30 gonzo pppd[24357]: Connect time 26471.0 minutes.
> >Oct 14 23:46:30 gonzo pppd[24357]: Sent 3628681779 bytes, received
> >977611132 bytes.
> 
> 	find /etc/ppp -type f -exec grep ppp {} \; -print
> 
> Most likely you have 'mtu 1500' and 'mru 1500' set in 
> /etc/ppp/options - comment these out and try again[1].
 
> 1. NB: Would it kill the ADSL providers to bump up the MTUs on their 
> link with Eircom (for eircom wholesale provision) or the ATM VC with 
> the customer by 8 bytes so the encapsulared PPP link doesnt have to 
> suffer 1492 MTU?

Well yes.

You see we use PPP over Ethernet - Ethernet has an MTU of 1500, but
the PPP bit takes 8 bytes, hence 1492.

T.