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Subject: [Bug 103762] ppp(8): some tun interfaces with a mtu of 1500 while i
 should never exceed 1472 with ppp
Date: Mon, 06 Nov 2017 12:30:19 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D103762

Eugene Grosbein <eugen@freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|freebsd-bugs@FreeBSD.org    |eugen@freebsd.org
                 CC|                            |eugen@freebsd.org
             Status|In Progress                 |Closed
         Resolution|---                         |Works As Intended

--- Comment #3 from Eugene Grosbein <eugen@freebsd.org> ---
It is pretty normal for PPP protocol to negotiate mtu=3D1500 if both sides =
are
configured so. Even PPPoE over non-jumbo ethernet frames with its own mtu=
=3D1500
can, nevertheless, negotiate and run with tunneling mtu=3D1500 if both peers
support LCP multilink extensions over single link.

It is just fine for some routers to keep persistent PPPoE connections, too.

As ppp(8) manual page says, one should use "maximum" keyword to make hard u=
pper
limit on PPP mtu/mru values.

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