[c-nsp] What MTU for Bellsouth BBG / BRAS <-> LNS l2TP tunnel?

[Gert Doering]

Hi,

On Thu, Oct 28, 2004 at 12:47:43PM +0200, Ueli Heuer wrote:
> as long as the IP MTU of the 10/100 ethernetsegment ist fixed to max
> 1500 byte you'll use some bytes for the PPPoE encapsulation and these
> bytes are missing in the paylod.

Sure, this is why PPPoA has some merits here :-) - in which case you
"just" need to make sure that full-sized IP packets encapsulated in
L2TP can be transported between LAC and LNS.

> the problem are firewalls- administrators (and vendors) who think
> _all_ icmp-packets are bad and they block  any icmp-messages.  so the
> source will not be notified to send smaller packets.

Full ACK.  Blocking all ICMP is evil.

gert
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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de