John Klos <john%ziaspace.com@localhost> writes: > create > tunnel 2001:470:a068:5:250:baff:fecb:32e 2605:bc00:0:114:230:48ff:fe98:d1a8 > inet 192.80.49.75 192.80.49.74 netmask 255.255.255.254 > > [snip > > However, NetBSD doesn't let the MTU for gif to be set to less than > 1280 bytes: > > #define GIF_MTU_MIN (1280) /* Minimum MTU */ > > Is there a good reason for this? If there is, then what's a better way > to route IPv4 over IPv6 while avoiding this issue? IPv6 requires that MTU be >= 1280. However, I am pretty sure that's a v6 rule. not general. So it should be possible to set the MTU lower if the inner protocol is limited to v4. I would suggest just ifdefing' out the check and seeing how it goes.
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