I know this is probably pretty basic for most of you, but I am a bit new to this and in need of assistance. I have a Cisco 2851 Router with a pair of Cisco 3560 Switches connected to it. It is a small LAN with a network address of 172.17.1.0/24. A customer (big customer) wants me to subnet my network to a /28 network to make it easier for them to configure VPN connection from our network into their system. All IPs are statically asssigned (cannot use DHCP due to an application we use). Is establishing this /28 scheme simply a matter of reassigning IPs and changing the SN Mask to 255.255.255.240? Is it true the that first and last subnets are unusable(172.17.1.0 - 172.17.1.15 & 172.17.1.240 - 172.17.1.255)? Are there any changes I need to make in the Router and/or Switches to facilitate this? By subnetting, will this result in communications between subnets being forced through the router or will communications still be handled at the switch level? Any asssitance is greatly appreciated.