On Sun, Sep 02, 2018 at 12:37:25PM -0400, D'Arcy Cain wrote: > On 2018-09-02 12:10 PM, Robert Swindells wrote: > > > > D'Arcy Cain <[email protected]> wrote: > >> On 2018-09-02 10:03 AM, Robert Swindells wrote: > >>>> The idea is to use re0 as my DSL connection and later to use athn1 in > >>>> the campgrounds as I travel. Here is the relevant portion of my rc.conf. > >>> > >>> Maybe use wm0 as the external interface. > >> > >> What would that give me? > > > > You trimmed the paragraph of my reply that described what it would give > > you. > > Sorry, I thought that it was unrelated. Are you saying that using wm0 > would allow me to set the MTU but re0 doesn't? > > > If you don't have an MTU of 1500 on pppoe0 you will have to deal with > > MSS-clamping for your internal networks. > > # ifconfig pppoe0 mtu 1508 > ifconfig: SIOCSIFMTU: Invalid argument
The mini-jumboframes have to be on the parent interface of pppoe0, i.e. wm0. IIRC also before you creating/assigning pppoe0 to it. Joerg
