When starting opevpn I encountered strange issue. VPN was connecting but I could not access services behind it.
What I found in its log was:
Thu Oct 16 12:15:50 2014 /sbin/ip route add 10.1.1.0/24 via 10.1.1.1
RTNETLINK answers: File exists
It turned out the newly added route was conflicting with other route (a leftover from messing up vpn-things).
First, I removed the conflicting rule:
sudo route del -net 10.1.1.0 netmask 255.255.255.0
Then I manually added the route the vpn was trying to add (but I think it’s optional and simply restarting the VPN would do the thing)
/sbin/ip route add 10.1.1.0/24 via 10.1.1.1