Roadmaster Snobbery Club
Join Date: Apr 2007
Location: Newark, Ohio
Bikes: 2002 Dahon Boardwalk 1, 2011 TerraTrike Path 8
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Not necessarily, some have auto-sensing.
However, I would turn OFF all router functions, so it acts as an access point, if at all possible. Some routers don't let you do this, some do.
(Wireless routers in access point mode are how my work's implemented a wireless access point.)
If you CAN'T make it work as an access point, then you should be OK, except for one problem. That problem will be that you can access anything in your wireless network and wired network from a laptop (or a desktop plugged into the wireless router,) but you cannot access anything in your wireless network from the wired network, unless you forward the ports for the relevant computer (or put it in the DMZ.)
Also, if you want to expose a port on a computer that's on the wireless router to the internet, you'll have to forward the port at the router, like normal, and then go to the wired router and forward the wireless router's IP.
For basic configuration (as in, other than disabling the routing functions) of the wireless router, usually defaults work, but if it requires you to pick a connection type, it'll be cable, that'll get it to select the correct settings to connect to the wired router. Actually, it'll be cable for most things - old-school PPPoE clients aren't that common any more, the PPPoE stuff is all built into the DSL modem.
And, for the love of $DEITY, set up security and a non-default SSID! "phantomcow2" is good enough for the SSID, and I'd set it to not broadcast (so you have to type it in to connect.) For security, set up WPA-PSK using RSA if you can. (Order of preference: WPA-PSK RSA, WPA-PSK TKIP, WEP 128-bit, WEP 64-bit, no security.)