securing an insecure line

[MAM VAN STEENSEL <mvanstee_(_at_)_baserv_(_dot_)_uci_(_dot_)_kun_(_dot_)_nl>]

Hiy all

Could someone help me with the following situation?
I have this setup:

Linux box ---Ether---- FreeBSD router +++++++telephone(ppp)ISP
I also have an OpenBSD SPARC hanging around not doing much at the moment
for want of a MAU.
My question is this: is there any way to secure the traffic between my ISP
(who can be regarded as ignorant) and my router? I have a Linux box at
work that I log into using SSH. Is ther a way to use it as a kind of
filter? I am also looking for an excuse to replace Linux with preferably
openbsd and put that on the router as well. Any tips?

Thanks a bunch

Maurice van Steensel
Department of Dermatology
Genodermatology
University Hospital Nijmegen
tel: +31-243617239

----- BEGIN GEEK CODE BLOCK -----
Version: 3.1
GMD/ d++ s-:- a? C++++ ULASX++++$ P+>++++ L+++ E+++ W++ N++ o-- k+++++ w--- O- M- V-- PS+++ PE Y+ PGP- t++ 5-- X !R tv- b++++ DI+++ D+G>++++ e+++++ h--- r+++ x+++>+++++>*
----- END GEEK CODE BLOCK -----