GIF MTU parmeter is needed

[Hiroki Sato]

Hideki Yamamoto <hyama99 at gmail.com> wrote
  in <90dbee150912261333l602c4161nccaf1995dc83699a at mail.gmail.com>:

hy> Hi,
hy>
hy> I often use FreeBSD for developing the gateway. For example, I use gif for the
hy> tunnel protocol when using IPv6 over IPv4 and use an application for changing
hy> packet address for special purpose.  When we were using old FreeBSD, such as
hy> FreeBSD 4.11, the MTU of the tunnel packets or forwarded packets
hy> was not limited into 1280. However, FreeBSD 6,7, and 8 fragments packets
hy> by 1280 when using tunnel.

 The gif(4) interface supports MTU up to 8192 and this has not been
 changed since FreeBSD 4.X IIRC.  Why did you think FreeBSD 6 and
 later supported a fixed MTU only?

-- Hiroki
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