I think you made mistake while writing netmask. You will see that
while one of your netmask is 7 digit, one another is 8 digits.

> I think I'm missing something here... I feel like this should
> "just work" because I've been doing this for years...
...
> mail# ifconfig fxp1 down ; ifconfig fxp1 delete ; \
> ifconfig fxp1 inet 66.11.84.97 netmask 0xffffff0
                                           ^^^^^^^
...
> mail# ifconfig fxp1 inet 66.11.84.97 netmask 0xfffffff0
                                                 ^^^^^^^^
Mustafa Dogan
dogan@tesmer.org.tr