On Sun, Sep 02, 2018 at 07:25:42PM +0100, Robert Swindells wrote: > > Joerg Sonnenberger <[email protected]> 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
