Hi folks. Have had the opportunity to read and learn from this forum, but this is my first post for help.
I work three days a week as an MS-Office instructor at a course provider. There are no dedicated network admin in the company, so i have to try to solve challenges in this area as well. For the most part things are running ok.
We have two separate wired lans. One for the staff and one for the students. The staff network, consisting of seven Win7 clients and a SBS 2011, runs without problems, so I don’t think I will have to go in to that segment any further(?)... We also have two separate wireless lans, that also runs without any noticeable problems.
The student network (cable), with twenty Win7 clients and a Windows Server 2008, is where the problem occur.
The client computers runs (apparently) just fine, but out of a sudden, one (or sometimes two) of them loses connection to internet. For the most part it happens to only one computer at the time, and it varies whitch one. From the affected machine, I can ping other clients, printers, DHCP server - but i cannot ping the gateway or any external addresses.
It seems also like its more prone to happen, when all (or at least most of) the client computers are in use (it happens seldom with only a few students logged on).
Out of a sudden, the affected pc can suddenly connected to internet again, and the problem can affect another client after a while.
The lack of connection can last from minutes up to an hour. What makes the connection come back, I dont know. The problem may seem minor, but it have pretty negative impact of the affected student and the teaching situation.
We had two very old switches (64K) in this classrom, so I hoped the issue was related to them, and bought two new ones (GB standard). The same problem still exists though.
Have tried release/renew of ip and have tried to set static ip/dns on the affected machine, but with no affect.
I hope someone has an idea, or can point me in good direction. Im not an network expert (yet:)) - so have that in mind.
If more info on network/server setup/topology is required, I will provide as best as I can.
Thanks in advance.