Problem Ping not working

[admin_2]

I have a problem It sounds not logical, the problem is I am not able to ping to the server, but i can get an ip address from the server, and this problem is not for long time after few hours it starts pinging to the server, Could any one help me to resolve this problem, We are using Cat Switches,

[maamann]

do you see the ip address in the arp table form the router ?

How many nic´s have the server ?

the ping is send form the same subnet like the Server ?

[#3]

There is only 1 NIC that is Gigabit card, is this some thing to do with QoS, enabled either on the switches, server or on the clients,....

[maamann]

under normal circumstances ( no heavy load and so on ) QOS is not a problem.

Is the G-Bit NIC configured as a dot1q Trunk or as a normal Access Port .

If you can not ping the NIC can you see the Mac Address from the Server in the Router ARP cache ?

please answer my other questions in the previous Mail.

maybe it is a Configuration Problem on the Server ?