Hi Sudhiphans,
Simplest is to subnet/create separate VLAN's. Or you can add IPSec filter through MMC console and add snap-in called "IP Security Policy Management" select local computer. Edit the rules section & under Security Rule wizard filter ICMP or IP traffic as Allow or Deny.
You can configure this via your firewall or can install software firewall in your server (but it will create mess of approvals,
if server is in production zone).
So first method is quite cool as it doesn't require any software installation or network modifications.