This is a puzzling issue I am hoping someone can help with in terms of what to look at for a resolution.
In the last few months, there have been a couple of connectivity issues regarding some of our computers on our office network.
The first incident involved a Dell e6400 laptop running Vista Enterprise that started loosing connectivity with network resources. The IP Address was dynamically assigned through our own DHCP server. Ping -t showed sporadic time outs while communicating with internal network resources and external IP addresses. The issue occurred regardless of ping by name or number.
I can't recall any changes made to the computer that would have caused the issue, but as soon as I assigned it a static IP address outside of our pool range, the problem cleared up and hasn't re-occurred since then.
The second incident just started occurring with a new server 2008 R2 box that had an IP address statically assigned. I have had the box up and running for several weeks without any apparent issues until a few days ago, when the same thing began to occur.
I first noticed an issue when attempting to Remote Desktop to the server while using a VPN connection to the office, and couldn't connect to the box. I was able to connect to an identical server that was configured and set up at the same time as the problem server. I used RD on that server to log into the problem server.
Performing the ping test, the same sporadic time outs would occur, but this time, only when attempting to communicate with the router/gateway address and anything external to the network. There were no time outs when pinging internal machines.
Upon returning to the office on Monday, I continued testing and has no issues with internal connections to the server, but the sporadic times outs continued to the gateway and externally. The identical server still showed no issues, and the response times matched for both servers reaching the same external resource.
Like the laptop, the problem went away as soon as I assigned a different IP address to the server. However, when I assigned the old IP address to the server that didn't have an issue, the problem began occuring on that server as well.
I checked our DNS records, and there are no mis-matched nor duplicate records for either the problem IP address nor for the server name.
Any clues on why this kind of issue is occurring would be greatly appreciated.