In /etc/hostname.pppoe0:

    inet 0.0.0.0 255.255.255.255 NONE \
            pppoedev nfe0 authproto pap \
            authname '12345@example.com' authkey 'abcd1234' up
    dest 0.0.0.1
    !/sbin/route add default -ifp pppoe0 0.0.0.1


In /etc/hostname.nfe0:

    up


In /etc/pf.conf:

    match on pppoe0 scrub (max-mss 1440)


Make sure to run `syspatch` or you may encounter "pppoe0: LCP keepalive timeout" errors.