gre tunnel with key

[Bazy]

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Hi guys,

I'm trying to establish a gre tunnel between 2 offices in different
cities, my problem is that, at the other end, they use a Linux router.
And they specified at the gre tunnel a key, as in: ip tunnel add goofy
mode gre remote x.x.x.x key 294.

I used gre before, but I have no idea how to set a key on FreeBSD.
I've read
http://www.freebsd.org/cgi/man.cgi?query=gre&apropos=0&sektion=0&manpath=FreeBSD+6.2-RELEASE&format=html
and other man pages, googled around... but with no luck.

Can anyone help me on this?



Thank you!
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