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I've got a Linksys WRT54G v2.2 and a SmartAX MT882 modem I can connect to the Internet by connecting a Ethernet cable from the computer to the router but not wirelessly. I did the following to get it setup from my computer, can anyone see what I may have missed?
On the Router:
Connect it via ethernet and went to 192.168.1.1 to login.
Disabled the DHCP server and change the address of the WRT54G to 192.168.1.200
Once applied, change IP address to 192.168.200.5 on computer, connect back in using the new IP address.
Switch the Advanced Dynamic routing on the WRT54G to the Router mode
In the advanced dynamic routing mode turned on the the Dynamic Routing (RIP) to LAN+Wireless because we will plug in the MT882 into the LAN port (Not the WAN/Internet port) of the WRT54G
In Wireless> Basic Wireless settings changed the Wireless Network Mode to G only. Set the wireless channel to 11.
WPA PSK, AES
On the modem:
Plug in your MT882 directly into the computer via Ethernet or USB and log into the administration panel via http://192.168.1.1.
In the MT882 administration in the advanced setting turn on/enable RIP (Dynamic routing) for eth-0 (its most likely already enabled for ppp-0, ie. your provider, but now it is enabled with the Ethernet too).
Now connect the MT882 Ethernet cable directly into one of the WRT54G's LAN ports. Now once the computers are connected they will ask for an IP address and the WRT54G will forward them to the MT882's DHCP server for an address and thus you will get multiple computers through wireless connected to the MT882 and the Internet.
Is the WLAN hardware up? Meaning, are you able to actually see and connect to the AP, just not able to get online?
If you can associate with the AP, are you then able to pull a DHCP lease? If you can get a lease then the next step would be to check the information given to you by the DHCP server, such as gateway and DNS servers.
But I am guessing you probably aren't getting a lease in the first place, so in that case I would try setting a static IP after authentication and then see if you can ping the modem and get anything on the WAN.
I can see the AP but never get connected to it. The DHCP lease looks interesting but I get a lease when connecting to the router directly with the DNS server set to the router so I'm not sure that that's the cause.
If you can't authenticate with the AP, the problem must be either in the wireless security settings (WPA settings, MAC filter, etc), or the actual over the air settings like channel and operating mode.
Try connecting with all security settings off, channel 6, and mode back to mix. If that works, start turning the settings back on one by one until you find which one causes the problem.