Linux Server Leaving the Network

[Barry Brimer]

> I am facing an issue in my organization. the issue is that the linux 
> servers are leaving the network and  i had checked all the logs there is 
> no such error which is mentioned in /var/log/messages/. kindly help me 
> out as this issue has caused a lot of problem in my organization. Will 
> be waiting for your reply   Thanks in Advance

Can you monitor link status on the switch via SNMP?  How many machines are 
we talking about?  Do they all have the same model NIC?  Are they all 
plugged into the same switch?  Are all the machines that have this problem 
plugged into the same model of switch?