Just in case anyone was wondering, I did some throughput testing on a
test VPN I have here.  It is pretty CPU intensive as far as I can tell. 
The VPN was running on two OpenBSD boxes with ~400 mhz cpus.  See the
details and gnuplots at:

http://www.ligo-la.caltech.edu/~sroddy/netpipetests/netpipe_tests.html

About a factor of 20 reduction in speed when going from
client->gateway->(encrypted)=>gateway=>(decrypted)->client.

I am going to do some further testing on faster machines.  I am also
going to try blowfish vs. 3des encryption.  Blowfish seems to be faster
than 3des on ssh.

-- 
Shannon Roddy
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