OpenVPN static IP and reserve it

Alexander

8/22/24, 4:02 PM

I build OpenVPN server, and topology subnet config is used. I also want to assign static IPs to specific user. My question is how to keep this static IP from being given out to the rest of the users on the server. Say, the server setup is like that:

server 10.3.18.0 255.255.255.0
route-gateway 10.3.18.1
topology subnet
client-config-dir /etc/openvpn/client

then I put the following to /etc/openvpn/client/user1 (user1 is the client name):

ifconfig-push 10.3.18.10 255.255.255.0

thus, the user1 client will be assigned the IP is 10.3.18.10, while all other clients will (should) be assigned IPs of 10.3.18.2 -- 10.3.18.9 then 10.3.18.11 -- 10.3.18.254.

And I very afraid that IP=10.3.18.10 will one day also be assigned to any incoming client and user1 (if connect after that) will not be able to get that IP. Yes I can choose static (reserved) IP of 10.3.18.254, not .10, but this won't guarantee that 10.3.18.254 be reserved, right?

Please advice how to deal with that.

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openvpn

ifconfig-push

Elon Musk

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EN: OpenVPN static IP and reserve it

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