Network Down

Respected Sir /Madam,

I have a windows2000 Network with SQL Server2000 as Backend.(3 10/100mbps Switches,3Patchpanels, 1 DSL Modem).
Nodes in the Network are obtaining TCP/IP address from DSL modem( NODES IN LAN AS WELL AS NODES FROM DIFFERENT LOCATION THROUGH PHONELINE ARE OBTAINING IP ADDRESS FROM DSL MODEM.), after working about 3 to 4 hours the whole Network is down. I tried to ping the Domain Controller and other Database Servers but it is showing “Timeout Error”.

After Restarting the Servers The Network is perfectly working…but again after 3-4hours it is hanged up.

I tried my things to solve the problem but still the problem persist . Please give me some Idea or solution to solve the Problem

Waiting for your early andsoon reply in this Regard.

Thanks and Regards

Nadeem.