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I had set openvpn 's config as

route 10.8.0.0 255.255.255.0 push "route 10.8.0.0 255.255.255.0" client-to-client

and set ccd/username as

iroute 10.8.0.0 255.255.255.0

BUT, the client's netmask was 255.255.255.252 yet. and server's ifconfig is:

tun0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet addr:10.8.0.1 P-t-P:10.8.0.2 Mask:255.255.255.255 UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1

I want to set client and server 's mask as 255.255.255.0, for client-to-client communication.

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  • Coud you post the actual routing tables from server + client? Commented May 8, 2014 at 10:41

2 Answers 2

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OpenVPN (in layer 3/tun mode) creates virtual point-to-point (like you would get with RS232 for example) links between the server and each client. Any traffic between clients goes trough the server (if there is no client-to-client directive, the server just drops those packets).

Check the routing tables of the clients they should say:

10.8.0.0/24 interface tun0

If you use OpenVPN in layer2/tap mode then it creates a virtual ethernet card with the proper IP and netmask.

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I think it is all a matter of setting the topology parameter to subnet, and then specifying the netmask on the server parameter at the server's config file, like:

server 10.8.0.0 255.255.255.0

Without the topology parameter it seems those changes will not work.

Extracted from here.

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