Windows routes - add many lines to routes table at once - windows

Question

I have to add many lines (rules) to the routes table in Windows.
The regular way is to add it with:
route add 10.0.0.0 mask 240.0.0.0 192.168.0.1
However, if I want to add many lines at once (belive me I have a good reason to do it) - how can I do it quickly (running "route add" is slow)?
I tried running it in some threads and it still slow.

Answer 1

Option 1:
You can use this MS tool: netsh
Netsh is a command-line scripting utility that allows you to, either
locally or remotely, display or modify the network configuration of a
computer that is currently running.
Build a file with all the lines you want to add, like this:
[For more information on "add route" command and its parameters, see here].
# ----------------------------------
# IPv4 Configuration
# ----------------------------------
pushd interface ipv4
add route prefix=10.0.0.0/4 interface="Ethernet" nexthop=192.168.0.1 metric=1 publish=Yes
add route prefix=240.0.0.0/4 interface="Ethernet" nexthop=192.168.0.1 metric=1 publish=Yes
[and so on...]
popd
# End of IPv4 configuration
Save it in a *.dat file, and run this command:
netsh exec file.dat
Option 2:
[As Harry Johnston commented]: You can use CreateIpForwardEntry function to add route (example code in the link).
The CreateIpForwardEntry function creates a route in the local
computer's IPv4 routing table.