OpenVPN - how to find who's connected?

[jabr at blu.org (John Abreau)]

Is there an easy way to determine who's currently connected to an 
OpenVPN server when it's using udp? I've been looking through the 
openvpn.log file, but it's not clear what corresponds to a connection 
starting and a connection stopping. I spent an hour searching on google 
for something useful, but ame up empty.

There is an occasional "Peer Connection Initiated" that looked relevant 
at first, but then it turned out these appeared at unpredictable 
intervals for a while, then stopped appearing entirely, for a connection 
that was on continuously over the weekend.

With the pptp vpn I'm replacing, I could look at the tun* devices with 
ifconfig to determine who was currently using the vpn. With OpenVPN, I 
have a single tap0 device which tells me nothing about the individual 
clients.

-- 
John Abreau / Executive Director, Boston Linux & Unix
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