A reasonable cheap solution is the zyxel NBG334W wifi router. It has a guest wiifi that only has access to the internet and not the internal LAN. Be advised this is wifi only for guests there is no wired optioin.
If you need wired option I would go with the zyxel Zywall 2plus for example which has two other LAN type zones which are firewalled apart from each other. You could attach your DI 604 to one of these zones and none of that traffic would reach your LAN or vice versa etc............
Feel free to ask as many questions as you like. -- Ain't nuthin but the blues! "Albert Collins". Leave your troubles at the door! "Pepe Peregil" De Sevilla. Just Don't Wifi without WPA, "Yul Brenner"
A reasonable cheap solution is the zyxel NBG334W wifi router. It has a guest wiifi that only has access to the internet and not the internal LAN. Be advised this is wifi only for guests there is no wired optioin.
I use a NBG334W at home. IMHO its a very nice router for the money. See the screen shot for my usage. -- "When all else fails, read the instructions..." MS-MVP Windows Desktop User Experience