VPN Questions - How does the client work?
From: Matt Ford (matt.ford_at_ntlworld.com)
Date: 08/14/03
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Date: Thu, 14 Aug 2003 09:49:39 +0100
Hi All,
Don't really know an awful lot about VPN and how the clients work and
was wondering if anyone could shed some light....I'm using the Cisco VPN
client on linux.
1) I assume that the client works at a kernel level and hijacks all
networking relating modules? Reason: I can't get out of my box whilst
connected with the VPN client. Also the output of netstat -rn does not
show routes to be any different when connected or not to the vpn client.
Maybe this is a problem with netstat? Maybe the routes aren't
changed? Client has it's own routing table?
2) What's hijacked (above) is controlled by the remote VPN server side
settings. I.e., the server tells my machine not to allow split
tunneling. And thus preventing me to bridge networks. (and actually do
anywork as corperate helpdesk access is prevented!!)
3) Is there anything I can do to get around this? Have I mis-understood
completely?
4) Any docs out there I can read on how a vpn client works? In terms of
above.
Thanks for any help!
Cheers,
Matt.
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