"scrub in" usage needs evaluated
changed from "scrub on" to "scrub in on", the latter at least with PPPoE is skipping mss-fix entirely. s/in// on the scrub line and it properly works. I think that "in" should be taken out, it's caused at least this regression and may have broken MSS clamping entirely. I'm not sure why that was changed though, so opening this for discussion.