TCP/IP Stack Corruption on VMware Host.

I encountered an issue this week where multiple VMs on a certain ESX host start having corruption of their TCP/IP stack. The 2008 VMs were unable to retain their gateway while the 2003 VMs were unable to retain any IP info whatsoever.  While still researching the cause, there is a solution. To repair the TCP/IP stack, just run this command which comes from this KB from Microsoft.

http://support.microsoft.com/kb/299357

netsh int ip reset c:\resetlog.txt

Here is a VMware Communities post with similar symptoms.

http://communities.vmware.com/message/1336502#1336502

This thread discusses the problem as well but doesn't really mention VMware.

http://social.technet.microsoft.com/Forums/en-US/itprovistasp/thread/27fd86ad-caad-4698-9032-63550695ee3d