Using Jumbo Packets

[Robert Elz]

    Date:        Sat, 08 Sep 2001 22:13:52 -0400
    From:        ab8kf@netscape.net
    Message-ID:  <7E2E2DDE.714E6570.000124A0@netscape.net>

  | Has anyone had any success with the jumbo packet feature,

Jumbograms aren't allowed to be fragmented (the fragment header doesn't
support it, even if it wouldn't simply defeat the purpose of them in
any case).

So you can only send one if you have an interface with an MTU that's
big enough.   That isn't any kind of ethernet, token ring, fddi, ...

There's no point an implementation providing support for them unless it
has support for one of the very few link layers where it makes sense, so
even if you could nominally send a jumbogram through the loopback interface
if you define its MTU high enough, I wouldn't expect implementations to
support just that one use.

The only point using the things is if you're using an interface where
handling an interrupt to process a packet is comparatively very expensive.

kre