[NTLUG:Discuss] Securing 802.11b

[Kipton Moravec]

I am looking at hooking up two networks together using two  802.11b devices
with external directional antennas. The distance is about 5 miles.  Assuming
I can make a connection, what do I have to do to make it secure, so noone
can stick up an antenna between the line of site and monitor the traffic or
break into the network.  One network has high speed internet access. The
other is in a hole in Garland where there is no cable modem and no DSL and
no other high speed internet access.  They tried satellite but it is down a
lot, and has gotten very slow since they got it.  So we are going to try to
connect the two networks with 802.11b.

I am trying to figure out what I need to read up on.

I think I need to set up a router/firewall on both networks to connect the
wire part of the internal network to the 802.11b part of the network.  What
do I need to read up on so that the data packets that are sent through the
air are encripted?  I looked in the firewall, bridging, networking, and VPN
how-to and it is either not there or I missed it.  Where would I find it?

Looking at http://www.seattlewireless.org  they mention IPSEC like
http://www.freeswan.org. ?  I think that might do it. Does anyone know
better?

Can I also limit the connection to a particular MAC Address?  Where would I
find the documentation? That may make it a little harder to spoof the
connection.   That part of the network is basically a point-to-point
connection and I want to ignore traffic that comes from any source other
than my partner transmitter.

Does this make sense?

Kip