Static route set from dhcp

Does anyone know if it is possible to add static routes with dhcp? I know that there is option 121 in dhcp but I read that it can set routing via some gateway IP, and I need to set routing via device. Manually I can do that in linux with:

ip route add xxx.xxx.xxx.xxx dev eth0

But I have no idea if it is possible (and how) with dhcp. I'm now using udhcpd.

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With DHCP for IPv4 this is possible. With DHCP for IPv6 not.

The option you are looking for is classless-routes specified in RFC3442.

Not sure if you can configure this option on udhcpd but I've seen and used it with ISC DHCP Server. The syntax for this option is a little strange and is described in the RFC.

Note: I think there are some problems with older Versions of Windows which will request another DHCP option.

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