[Bug 103762] ppp(8): some tun interfaces with a mtu of 1500 while i should never exceed 1472 with ppp

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=103762

Eugene Grosbein <eugen at freebsd.org> changed:

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

--- Comment #3 from Eugene Grosbein <eugen at freebsd.org> ---
It is pretty normal for PPP protocol to negotiate mtu=1500 if both sides are
configured so. Even PPPoE over non-jumbo ethernet frames with its own mtu=1500
can, nevertheless, negotiate and run with tunneling mtu=1500 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 upper
limit on PPP mtu/mru values.

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