Shorewall users - May 2005 - OpenVPN ifconfig

I''m new to openvpn and maybe I should be asking on
openvpn''s list...
But I read the tutorial:
http://www.shorewall.net/OPENVPN.html#id2452626
 and saw the following:
" On System A:
ifconfig 192.168.99.1 192.168.99.2 "
I don''t understand the reason for using these "virual"
IPs.
For instance, I configured openvpn on my peers so that
the IPs on the "LAN cards" are the ones appearing on
the "ifconfig" line. i.e.:

System A
LAN 192.168.1.0/24
Linux OpenVPN with eth0 = WAN IP and eth1 192.168.1.1

System B
LAN 192.168.2.0/24
Linux OpenVPN with eth0 = WAN2 IP and eth1 192.168.2.1

On system A, openvpn conf file includes:
ifconfig 192.168.1.1 192.168.2.1

On system B, openvpn conf file includes:
ifconfig 192.168.2.1 192.168.1.1

I''m curious to know why the tutorial uses the
192.168.99. IPs. 

If this question is off-topic or if I missed something
in the documentation (or if I should simply re-read
openvpn''s site) then I apologize. 

Regards

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Vieri Di Paola wrote:
> 
> I''m curious to know why the tutorial uses the
> 192.168.99. IPs. 
> 
Because that''s they way that all of the HOWTO''s at Openvpn.net
configure
a tunnel.

-Tom
-- 
Tom Eastep    \ Nothing is foolproof to a sufficiently talented fool
Shoreline,     \ http://shorewall.net
Washington USA  \ teastep@shorewall.net
PGP Public Key   \ https://lists.shorewall.net/teastep.pgp.key

Tom Eastep wrote:
> Vieri Di Paola wrote:
> 
>>I''m curious to know why the tutorial uses the
>>192.168.99. IPs. 
>>
> 
> Because that''s they way that all of the HOWTO''s at
Openvpn.net configure
> a tunnel.
I should say "...configure a _routed_ tunnel".

-Tom
-- 
Tom Eastep    \ Nothing is foolproof to a sufficiently talented fool
Shoreline,     \ http://shorewall.net
Washington USA  \ teastep@shorewall.net
PGP Public Key   \ https://lists.shorewall.net/teastep.pgp.key