A Flexible VPN with FreeS/WAN and Linux, Part 2
Earthweb tels us more about building a
"The gateways must have fixed, routable IPs. Client machines can have non-routable IPs, behind IP masquerading. The subnets must be in different IP ranges, even though they are masqueraded. Be sure that packet forwarding is enabled on the "Internet" machine. It is usually turned off by default, a wise precaution. Also on your "Internet" box run a packet sniffer and traceroute. Ethereal has a nice graphical interface, and tcpdump comes in all Linuxes. See the ping test page for good testing scenarios."
(Submitted by Noel Thu Apr 25, 2002 )
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