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How to assign Static IP for OpenVPN Client?

Posted on 2009-04-25
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Last Modified: 2012-05-06
I have Client both WinXP and Linux, and now it has dynamic IP from OpenVPN server
How to assign Static IP for them?
(I config with: dev tap0)

Thanks in advanced!
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Question by:laptop1vn
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Expert Comment

by:Qlemo
ID: 24235025
If you have used --ifconfig-pool-persist, the certificate determines the IP address (stored in the file as stated as argument of that option). If you use the same certificate, you get the same IP address.
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by:laptop1vn
ID: 24235210
But I use the same cert for all Client :(

Have u got solution, or I need create cert for each client?
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LVL 72

Expert Comment

by:Qlemo
ID: 24235331
OpenVPN cannot identify the client uniquely if you use the same certificate for all clients, hence it cannot assign the same IP each time. Opposed to DHCP, OpenVPN does not consider MAC addresses, which would help in re-assigning IP addresses.

You have to create unique certificates, which you should in any case. Imagine you have to lock one of those clients for whatever reason ... With unique certificates, you can create a revocation list to invalidate certifcates.
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Author Comment

by:laptop1vn
ID: 24240379
Yes, but how Server allocate IP address with each certificate of client?
It's mean, what IP number to allocate?

Can I assign fix IP for TAP-NIC of client?

And I have other problem, some Client connect well and not be changed IP (VPN server use DHCP)
and some other client disconnect Each Some Minutes, so change IP each restart time!
Is it normal?
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Accepted Solution

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Qlemo earned 1600 total points
ID: 24243565
No, such an interruption is unusual. However, this could be a result of confusing IP addresses between users with the same certificate.

With unique certificates, the file as mentioned keeps the certificate owner / ip address pairs. You can edit that list, if you are keen on it, but it is much easier to let them connect once to get a new IP address, which is sticky from now on.

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