Monitoring OpenVPN TUNs with MRTG

[Eduardo Grosclaude <eduardo.grosclaude@xxxxxxxxx>]

I want to check some client OpenVPN TUN interfaces with MRTG running at my VPN server, so I have to specify their OID interface numbers in mrtg.cfg. 
The problem is, these numbers are dynamic, as they may change whenever OpenVPN restarts for any reason... so, how can I write stanzas such as 

Target[somehostvpninterface] : ifInOctets.X&ifOutOctets.X:public@<SOMEHOST.IP>

without wiring up the X interface number into cfg file? Or, is there any method to keep X from changing at the clients?

Any hints appreciated!
-- 
Eduardo Grosclaude
Universidad Nacional del Comahue
Neuquen, Argentina
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