|Switches only work at layer 2.|
Except of course for layer 3 switches, and there are many of those out there.
While incorrect about switches only working on layer 2, ace is correct about the following:
You need a router before your switch
I would highly recommend you buy a SOHO Router and connect your highspeed modem to it's WAN port and your switch to a LAN port. Then I would give your EnGenius an IP in the same subnet that isn't in the DHCP Scope.
SOHO Router LAN port:
DHCP Enabled = Yes
DHCP Scope = 192.168.1.100 to 192.168.1.199
Default Gateway: 192.168.1.1
One of the added advantages of having everything behind the router is that the router also has as firewall which will help to prevent intrusion into your LAN from outside thus protecting you and your equipment.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.