> ipsec.conf -- i was reading over the docs, and I know that it says to keep
> left and right the same throughout the ipsec.conf file but, it started
> occuring to me (as I read more) that this only applies to each side.. ie
> # office network
> conn office
>     left=192.168.1.254
>     right=192.168.2.254
>
> where left is the office, and right is the home, however on the home
> computer, I would reverse those settings, ie
>
> left=192.168.2.254
> right=192.168.1.254

Actually, IPSec systems are peers...in ipsec.conf, the system can be
*EITHER* left or right.  The FreeS/WAN code figures out whether it's left or
right based on comparing your network configuration with the information in
ipsec.conf, and will complain if nothing matches (ie the system is neither
left *or* right, typically due to a configuration error).

To make life easier, most folks choose some arbitrary conventions for their
configuration file format.  If you're VPN configuration is just a single
point-point link, it's usually easiest to use exactly the same configuration
file on both ends of the link.  This can be extended to multiple point-point
links by using the include feature, and making each VPN connection a file.
You can then use exactly the same connection descriptions on all your VPN
machines, controlling which links get brought up by what you include in
ipsec.conf.

I've settled on a convention where the local system is always "left", and
the left connection parameters are specified in a default conn section.  I
also have a large number of "right" side connection specifications (one for
each VPN access point on my network), and I can easily make VPN links to any
of the possible remote points by simply including the appropriate endpoint.
This allows me to fairly easily build and configure a system with several
(about 10) VPN points, and a partial mesh network (most VPN links are
connected to several other points, but it's not (and can't be) a total mesh,
because a: it's not neeeded, and b: several endpoints are dynamic IP's).

Charles Steinkuehler
http://lrp.steinkuehler.net
http://c0wz.steinkuehler.net (lrp.c0wz.com mirror)


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