Network Crash Simulator can be used to simulate network crashes. It came from a need of QA team to simulate multiple network crashes in a easy way..

How it works
It's a very simple tool that makes the selected network adapter to be unusable by changing it configurations. It's done in two different ways depending on the network configuration you have, DHCP or Fixed IP.
In a DHCP enabled network adapter the software leases the configuration of the adapter. To repair to just renew the adapter settings.
In a Fixed IP Address network adapter the software changes the configuration of the network adapter to a Reserved IP address, change the default gateway to a loop back address (127.0.0.1) and save the original configuration to the "AdapterConfig.ncs" file. To repair the application restores the original configurations from the file back to the adapter.

Requirements:
* NET Framework

The license of this software is Free, you can free download and free use this network utility software.