I believe this is the same root problem as I'm seeing in Karmic.  The
vpnc generated nameservers get added to the *end* of the resolv.conf
list, rather than the beginning.  Thus, nameserver requests for hosts
reachable over the VPN connection fail because the non-VPN nameservers
respond first saying that the address does not exist.

A workaround is to reorder the entries in resolv.conf so that the vpnc
generated nameserver is first.  It is tedious to do this by hand every
time one connects via VPN.  This was not an issue in Jaunty (for me, at
least).  The real fix is to have resolvconf or whatever writes the
resolv.conf file to put the vpnc generated nameserver first
automatically.  An even better fix would be to support split DNS for
hostname resolution.

-- 
vpnc issue with /etc/resolv.conf prevents connection
https://bugs.launchpad.net/bugs/297796
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