Hi,
It should actually be not very hard - we should be able to set "tt->actual" to read "interface=nnn", and then it should work automagically without even touching route.c at all
Setting "interface=<idx>" to "tt->actual_name" will affect all code branches which use that value, for example "netsh_enable_dhcp". In this particular case we cannot use index and must use interface name, according to MS (https://technet.microsoft.com/en-us/library/cc731521(v=ws.10).aspx#BKMK_setaddress)
Same documentation claims that "set/delete address" accepts interface index only for ipv6. That said, "add/delete route" accepts index for both ipv4/ipv6. Besides, ipv4 syntax for "set address" is "[ name =] InterfaceName" and ipv6 is "[[ interface=] String]".
So, if we want to use index also for "add/del route", I'd gently modify add/del_route_ipv6 and make it use "interface=<idx>" (without breaking "vpn server special route" case).
What does surprise me, though, is that it works for you with just specifying the interface index, without "IF" or "interface=" before it.
MS says "[[ interface=] String] Specifies an interface name or index" for "set address" and "add route". If I read it right, "interface" prefix can be omitted. But let's use it for consistency with existing code.
-Lev
