Hi Guys,
Just have a bit of confusing situation. I have got a new client who has got issues on the network wherein the pcs are dropping randomly of the network. The setup is that they have got Cisco 2800 series router with Site to site VPN setup. They have one Win 2k3 DC server, 2 applications servers, one ISA server and one lotus notes server. In addition to this they have got a Zyxel modem which is used to connect to the internet.
Initially the ip address range was 10.135.12.xx on all the servers and the clients. They advised that recently they had to change the IP addresses on the servers and Clients. They have changed the IP address on the servers to 10.135.12.xx range with subnet of 255.255.252.0 and using 10.135.13.xx range for the clients. The DHCP server is on the Win 2k3 server and the default gateway for the clients is 10.135.12.1 that is of the cisco router ? I was advised that it forwards all the traffic to the ISA server and the traffic goes from there to outside world.
Since the IP address changes the pcs are getting disconnecting randomly from the network sometimes they come back on by themselves or you might need to disable and reenable the LAN connection in the pc. The pcs and servers are connected to 3com Switches. I have done the following troubleshooting:
assign static IP address to PC with 10.135.12.xx range as well as 10.135.13.xx range
rebooted the servers, cisco and the switches
disabled the firewall on the machines
when this happens cant ping to and from the affected machine.
Sorry for posting long question, any help and suggestions would be greatly appreciated.
Thanks