[c-nsp] L2TPv3 across an ADSL network: MTU

[Vincent De Keyzer]

Philippe,

I'm not sure this will be a problem: I have seen L2TPv3 tunnels 
successfully transmitting large packets over FastEthernet links (which, 
AFAIK, are also MTU 1500).

I believe L2TP has some kind of MTU discovery + fragmentation mechanism.

V


Philippe Strauss wrote:
> Hello,
>
> We need to offer a cheap "bridge" or "transparent" to ethernet layer
> frame for 2 sites of a customer.
>
> First I thought "ok, let's try L2TPv3 across SDSL*", but a closer look and
> the MTU problem came to my mind: the ADSL* network is limited to 1500 bytes MTU.
>
> Any idea of alternatives beside a plain good old leased circuit
> delivered on ethernet interfaces?
>
> *Note: here (switzerland), swisscom offer what they call SDSL service
> on the same LAC/LNS setup than ADSL. you get symmetrical 1.8Mbit/s
> circuit on SHDSL WIC, tunneled thru their network, ending up in your
> LNS.
>
> regards.
>
>