Mac failing to connect to ethernet network/internet

Help this is driving me nuts. My mac connects to the network only intermittently. I have 3 macs networked via ethernet, connect to a switched ethernet hub which is connected to a dsl router. There are other PC's in the building that connect to this wired network and thus the internet. All the 3 macs (running leopard, all upates installed) have been set up using DHCP and all has been fine for years. Now one mac has trouble connecting to this network. The error messages imply the internet connection is at fault but both other macs and the PC's are connecting OK. I suspect its a network issue as the other macs can not see the faulty mac when it's playing up. I don't understand why 2 work fine but not the other. At times I could surf the net but mail failed to connect saying it could not connect to a server port. Now the mac seems to have dropped of the network completely - but it seems to see a ethernet connection when running diagnostics. I have not posted any error messages because they all seem to differ and are not consistent. Should I start again? what's the best way to set up a network like mine - it has been run like this for many many years. Am posting this on one of the other macs as the faulty mac has been offline for days now. Weeks ago we did have a similar problem on the third mac but after 1/2 hour and restarting the hub it has been running fine ever since. Thanks for reading this and if you need any more specific info, or for me to run a test and report the results, let me know.

Hi Suggsy-
Your hub (switch?) could be failing. It is possible for one port to become flakey while the others all work fine. Can you try another port?
If that fixes it, combined with the other problem from weeks ago, it may be time to replace the hub.
If that does not fix it, be sure to try a new ethernet cable.
Luck-
-DP

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