Some users may experience DNS resolution troubles. In this case they need to change the OpenVPN nameservers in /etc/resolve.conf
These values are different from server to server and may be retrieved from openvpn connection log or syslog. If you unsure how to do that, try to set google's nameservers in
/etc/resolv.conf, they are 22.214.171.124 and 126.96.36.199
(I didn't have any issues in my setup, just providing some additional info if needed)
From the IRLP.net webpage
NODE STATUS SHOWING DOWN
Internet DNS (Domain Name Service) is now required to find the status page and report your status correctly.
Test it from the command prompt with 'ping www.irlp.net' (ctrl-C to exit) If you get an "unknown host" error, you have this problem.
To fix, edit the file /etc/resolv.conf. (You can also enter 'setup' from the command line and select Network Configuration. Make sure the IP addresses behind the word "nameserver" are the IP addresses of your service provider's nameservers. Some routers (linksys for one) automatically populate nameservers data.