We have had a couple IPs that can not longer be used because they have connectivity issues. I changed my file server (Windows 7) form 10.1.1.3 to 10.1.1.4 because it can no longer be pinged (pung? lol). I changed my file servers IP to 10.1.1.4 and no all the problems go away. and Now my ESXi server is doing it?!
We recently had a network outage on one of our DNS servers and it randomly changed from static to dynamic and screwed up our DNS. Another weird problem is googles DNS IP (188.8.131.52) had put itself as a forwarder in our 2008 R2 DNS server with notice. Maybe there is some connection between the two?
What I have done so far is take one of our DNS servers offline one by one to see if connectivity to 10.1.1.7 comes back, it did not. I have also have restarted several networking devices such as our ASA our DHCP but nothing changed. No other device is taking 10.1.1.7.
Windows 7 and Windows server 2008 R2 is pretty much the same but i was asking here because a lot of folks seem to be in IT so I was looking for same experience not really strictly answer so I thought it wouldn't hurt to ask the talented folk here as well