In order to be compatible with remote viewing of the Slingbox the gateway needs to have some sort of Port Forwarding impementation. This allows a public request (from the internet) of a particular port (5001 is Slingbox's default) to be fowarded into a local IP address. Most routers have this available, but not all of them call it by the same name.
There's another website that can help assisting setting up your gateway with Slingbox (http://portforward.com/english/applications/port_forwarding/SlingBox/SlingBoxindex.htm) They have a long list of gateways. Btw, here's a link to yours (http://portforward.com/english/routers/port_forwarding/Linksys/WRT110/SlingBox.htm)
Also. Universal Plug and Play (uPnP) is another nifty feature that networking equipment have these days. And since most gateways have a built-in wireless access point, a fast one with Wireless G or N compatibility is nice to have.
Thank you for your reply. I did a reset. I do not know how to find out the IP address of my Slingbox. I am unable to access anything for my Slingbox because it says it cannot be found on the network (so I can't access some of the first screens from this website: (http://portforward.com/english/applications/port_forwarding/SlingBox/SlingBoxindex.htm).
Any suggestions as to how I can find the ip address for my slingbox so I know where to forward the port? Thanks.
If you do a reset, then it should be able to get an IP address from the router's DHCP server.
Maybe check the router's list of active DHCP leases, or retry performing a factory reset. Power off/on if necessary.
As far as getting the IP address of the Slingbox, you can get that from the Slingplayer Desktop software (provided it can find the SLingbox) http://support.slingbox.com/go/windows-download-desktop-us
Help | About Slingbox <model> (Alt+E) | Information tab | LAN subsection there you'll find both the IP address and the Port Number necessary for Port Fowarding.