Need to HIDE my router from lan users

On some of my public networks, I need the ability to hide my router ..

Sometimes we get users who like to tinker by scanning out hosts on the LAN .. My router serves certain functions, but is NOT the DHCP router on the network .. Here's my setup:

172.16.0.254 - Cisco 800 Series Router (DHCP/DNS)
172.16.0.101 - 172.16.199 - DHCP HOST RANGE
172.16.0.63 - Linksys WRT54GL (FTP/HTTP) no dhcp running

I need to block ICMP on the LINKSYS .. I want to make it...

Need to HIDE my router from lan users