Re: Travel router part 2

[Joerg Sonnenberger <joerg%bec.de@localhost>]

On Sun, Sep 02, 2018 at 07:25:42PM +0100, Robert Swindells wrote:
> 
> Joerg Sonnenberger <joerg%bec.de@localhost> wrote:
> >On Sun, Sep 02, 2018 at 03:03:37PM +0100, Robert Swindells wrote:
> >> If you are useing pppoe(4) to connect to the ISP then you may want to
> >> set the MTU of the ethernet device to 1508 so that you get an MTU of
> >> 1500 on the pppoe tunnel.
> >
> >This depends on the ISP to also support that option. Many (i.e. Deutsche
> >Telekom) simply don't :(
> 
> Sure, but he will never find out whether it does support it if he is
> using re0.
> 
> When I added support for RFC 4638 there wasn't any way to test what
> would happen if you asked for a larger MTU but didn't get it.
> 
> Is there a need for some debug messages from pppoe(4) based on using
> it to connect to Deutsche Telekom ?

The peer simply never sends the PPP option for the larger MTU.

Joerg