How do I setup OpenVPN client on Mac?

Can OpenVPN clients talk to each other?

Can I use the same OpenVPN client in two different locations (ie. At work and at home) and have each of them connect to my OpenVPN server? Will I need to have each client talk to the server using a different subnet for each, or is there some sort of magic that allows them to be on the same subnet without getting confused about which one they're talking to? I just made it work with static routes. Each client was bound to its own static route to the openvpn server. I don't see why this wouldn't work, but I haven't used openvpn in a while.

Edit: I just realized that the openvpn server should behind a firewall. Perhaps an icmp redirect at the firewall is required to tell the openvpn server where the clients are. I can't be sure.

How do I share OpenVPN connection on Mac?

I have been struggling to connect my VPN on my Mac with the following error "Failed to add IP address for 'default' : No such file or directory"

I have tried to search for the solution of this problem but found no relevant results.

Any help would be greatly appreciated.

My OpenVPN .ovpn file, is located in /Library/OpenVPN/configs.

MacbookPro.local TunnelType 1. Dev tun. Proto udp. Remote 10.18.10 1194
Resolv-retry infinite. Nobind. Persist-key. Persist-tun. Ca ca.crt cert mycert1.crt key mycert2.key comp-lzo. Verb 3. Mute 20. Route 10.1 255.0 255. I have just tried it on my Mac and it's working perfectly. This is the content of my OpenVPN config.

Client. Remote 172.31.1 1194
Cert testclient.crt key testclient.0 redirect-gateway def1. Tun-mtu 1500. Comp-lzo no. Auth-user-pass. Ifconfig 10.