[Openvpn-users] getting TAP's IP-address given via external DHCP

[Silver S. <si...@ul...>]

Hello!

I use OpenVPN 2.0.6 on FreeBSD. My OpenVPN-server isn't configured to give its 
clients DHCP-addresses - it's done by bridging and ISC-DHCP server (in order 
to be able to give static addresse based on MACs).

The problem is that I'd like to add a specific route based on client's real 
interface's IP-address - to check whether it wouldn't conflict with any 
existing route and then add the route to that net to the routing table. With 
such schema (external DHCP and matched MACs-IPs) I'm somewhat able to give 
clients static addresses basing on MACs and create routes based on these 
addresses, but for an instance, FreeBSD creates its devices dynamically so 
the TAP-device has a different MAC after every reboot.

If OpenVPN gave addresses, I could match $common_name and 
$ifconfig_pool_remote_ip (I guess - I haven't tried it yet) with 
client-connect script, but as an external DHCP-server is used, is there a way 
to know what's the address that remote TAP gets from external DHCP? Or what's 
the address of the remote "real interface"? Is there any other solution to 
what I'm trying to achieve?

Thanks in advance,
Silver