We have a network with 5 Dlink DES 3526 switches. These managed switches were confiigured by a previous company, I have taken over there maintenace for about a year now, as the previous company lost the contract to support the network.
The network has been working fine, until last week when we started losing packets on the network.
The switches are configured so that they isolate 4 floors in the building.
We have been using a Vigor 2800 router to access the internet and provide dhcp to the network, 4 cables are connected from the router to 4 of the switches.
There is an sbs2003 server for 2 floors, the dhcp has been disabled on the server.
We are in a situation where users across the entire building are losing internet access, the users on the sbs2003 server are losing access to email, so outlook says its losing connection to the server.
At times when I ping the server, I get a reply and then packets are lost, how do I isolate the switch which is causing the problem?
I have considered testing by getting an unmanged switch and plugging the cables from the managed switch one after the other until I find which switch has the problem, is this a good idea?
Switches are not my strong point so bear with me.