Wire connect the 1100's WAN or Internet port to the 2300's LAN port.  Log into the 1100 and change it's IP address on the DHCP side to something other than the 2300's range (if the 2300 is 192.168.2.1, make the 1100 192.168.3.1).  It will be an access point, on a seperate network, but it works that way.

You can also disable DHCP on the router and give it a Static IP Address on the lan.

Wasn't sure the 1100 could do that.  That makes it easier and keeps all computers on the same network - do that instead.  Assign the static IP address in the router's network group as the 1100's WAN ip address.