Allowing one specific IP to be accessed outside the VPN

[Steve1985 5]

I would like to be able to allow one specific IP adress to be accessed outsite the VPN (using OpenVPN, MerlinWRT latest firmware 55). 
So all other traffic should be handled within the tunnel except for connecting to that specific IP.

This has to do with accessing the online library of my university that whitelists on IP and using the VPN service gives me a to dynamic IP adress unfortunately because of disconnects and saving settings etc.

Can anyone help me setting this up using iptables? Found a lot of info on the web port forwarding etc to a LAN IP but couldn't find much info on this specific situation.

Thanks!

Steve

[eyes878 43]

If you connect to the same server, you will be provided that server's IP everytime. I don't know where you are based but if you find a server that has been up for a long time, then chances are it won't be going down anytime soon.