On Mon, 18 Oct 2004, Thomas Bridge wrote:
> On Fri, Oct 15, 2004 at 12:34:08AM +0100, Paul Jakma wrote:
>> 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.
How much of this goes over actual ethernet links though? The ATM VC
to eircom - doesnt care about ethernet MTU... the circuit between
Eircom and you, surely can be adjusted.. That leaves the internals of
Eircom's router^W"BAS" - unless they terminate the VC on a different
machine to where they encapsulate it into L2TP, that leaves only the
link between the BAS and the router handling the link to the ISP.
So I can see why that'd be difficult.
However, in my case, the ATM VC terminates directly with you, doesnt
it? And /you/ can just bump up the MTU on your router, no need for
eircom to be involved.
(unless you do the PPPoE on a different router to that where the ATM
VC terminates, /and/ you have an ancient, non-jumbogramme capable
network between them, like Eircom do presumably..)
Paul Jakma paul at clubi.iepaul at jakma.org Key ID: 64A2FF6A
The reason computer chips are so small is computers don't eat much.
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