Null IP Routing in C++ Question

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Does anyone know if "Null Routing" can be done in C++?
I am using Windows 7 and Visual Studio 2010.

Title changed to better reflect the questiion.
-Emilio-

Posted 21-Jul-11 5:21am

Member 7766180

Updated 21-Jul-11 21:44pm

Emilio Garavaglia

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Maximilien 21-Jul-11 11:52am

what is null routing ?

Member 7766180 21-Jul-11 12:40pm

See below.

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lewax00 · Accepted Answer · 2011-07-21T05:53:00

Solution 1

Do you mean like writing to /dev/null in Linux? If so Windows has a file called nul in system32.

Posted 21-Jul-11 5:53am

lewax00

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Member 7766180 21-Jul-11 12:40pm

This is from the command prompt....
route ADD 124.151.99.22 MASK 255.255.255.255 192.168.1.253
I wnat to do it in C++....
This takes a source IP that is coming in and instead of receiving it on your local machine it sends it to a "Black Hole" basically nowhere.

Emilio Garavaglia 22-Jul-11 3:50am

You are misinterpreting the meaning of "routing".
The line you wrote, literally means:
"send all packets directed to 124.151.99.22 and it alone (MASK 255.255.255.255 means just that) to 192.168.1.253

Is not related to the packets you receive, but to the answers you eventually reply to it. IP routing is destination directed (not source!).
The fact it is a black hole or not, then, depends on what 192.168.1.253 actually is into your network.

lewax00 21-Jul-11 13:04pm

You could edit the hosts file ( system32\drivers\etc\hosts ) to the same effect I believe. And if that's from the Windows command line just do system("route ADD 124.151.99.22 MASK 255.255.255.255 192.168.1.253");

Member 7766180 21-Jul-11 18:35pm

It's doing something. It says "Route Addition Failed. Object Already Exists." What can this possibly mean? Is it really send the IP address off to oblivion?

lewax00 21-Jul-11 18:37pm

It means it's already been added I suspect, you probably only need to do it once unless you remove it again afterwards. If your command line example works then you should be fine.

Member 7766180 21-Jul-11 19:07pm

How do you remove it?

Member 7766180 21-Jul-11 19:13pm

Did this, now it says OK
system("route -p ADD 192.168.32.128 MASK 255.255.255.255 192.168.32.254");
system("route delete 192.168.32.128");

lewax00 21-Jul-11 19:19pm

Then do whatever you need to between those statements and you should be good.