Windows Blocking IPs by subnet

[Appzyt]

Hi

I am having problems with DDoS attacks on my remote server. Its a Windows 2003 machine. I located the source of the problem to Australia and blocked his IP from getting access from our services.

In order to prevent this individual from getting back I would like to block a range of IPs and the smartest way to do this is to block of a subnet.

The problem for me is I do not really understand how this works. I got hold of a Subnet Calculator wich somehow would help the user into getting the Subnet that Im looking for.

Online IP Subnet Calculator

The subnet would go from 122.144.00.00 to 122.144.80.90.

Anyone got a clue on how this is done?

 

[Cykotitan]

Must've been the australian dumbfuck again. Use IPSec policies

 

[Appzyt]

I am so sorry. Just found out what I did wrong. You can close this thread!

Edit:
This guy famous? U.u

 

[Cykotitan]

no, it's an inside joke. if you're ever going to use IPSec later, How to Block an IP Address using IPSec (Specific IP subnet instead)

it's pretty useful if you can't manage a higher level firewall (like router)

 

[Appzyt]

Me again. It turns out that the traffic that is making my server crash is not ingoing traffic but out. IPSec policies will not help with this case since Im only blocking ingoing traffic. Is there some way to block out outgoing traffic from a certain IP or subnet?

I have yet to discover what is being send from our server to the fellow in Australia so I figgure I just block the traffic between the two of us til' I find the issue.

 

[Appzyt]

Bumping

 

[Cykotitan]

Why don't you compile with -ggdb for GDB, so you can get a proper backtrace of the crash