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I've just been through the fun and games of setting up a D-Link 300+ ADSL modem (very similar, I believe to the 300G+ mentioned frequently here) on my Airport Extreme network. It took a while, but I got there in the end.
My setup consists of a PB12" under OSX10.2.6, Airport Extreme under 3.1, a D-Link 300+ ADSL modem. I also have an iMac DV+ on the wireless network.
I'm very new to ADSL (got it yesterday), so if there are any obvious errors here, please feel free to point them out! I thought , though, given problems that others have mentioned connectging with this modem it might be worth giving a run down on what it took to make it work for me:
1) Turn off airport on the Mac you are going to use to configure the modem
2) Connect the Mac to the Dlink 300+ Modem using an Ethernet cable . (Do NOT connect the modem to the phone line at this stage)
3) Set up the Mac to use built in Ethernet by firing up Network under System Preferences (from the apple menu) , choosing Network Port configurations from the Show drop down, and making sure that there is a tick box next to built in Ethernet, and dragging it to the top of the list (or removing any other ticks from the other options). Click on Apply Now
4) Now choose built in Ethernet from the show drop down in System Preferences/ Network. Under the TCP/IP tab select using DCHP from the configure menu. Click on the apply now button
5) Start up your web browser ( I used IE5.2)
6) Make sure that ALL proxies are turned off in the web browsers preferences (including the one that says something like use web proxy for all even though you don't have a web proxy selected)
7) Type http://192.168.0.1 in the address bar of the browser and hit return
8) Select Bridged Ethernet RFC1483 from the Connection type menu and click on OK
9) Wait for the settings to be saved.
10) Restart the modem after connecting the Ethernet cable between it and the Airport Extreme base stations WAN port (the one with the ring of dots)
11) Go back to Apple menu/System preferences/ Network
12) Select Network Port configurations from the show menu again.
13) Put a tick next to Airport and drag it to the top of the tree in place of built-in ethernet
14) Click on Apply Now
15) Now choose Airport from the show drop down in System Preferences/ Network. Under the TCP/IP tab select using DCHP from the configure menu. Enter your DNS number in DNS box (don't know if this really makes any difference, but I did, and it worked for Netspace its 126.96.36.199) Click on the Apply now button.
16) Hook up the cable from the modem to the phone socket (not sure if it matters at all when you do this I may have done it after step 20 below
17) Start up the Airport setup assistant, select the configure base station option, and hit continue. Enter your Airport passwords as requested and then chose I am using another Internet Service provider (I have absolutely no idea what happens if you are an AOL user). Click on continue
18) select the bottom button (Cable or DSL using PPP over Ethernet). Press continue
19) enter your account details (I think you have to put in the domain name after your user name ie firstname.lastname@example.org rather than just xxxxx). I also filled out the Name server address and Domain name fields , selected Disconnect Never and Automatically connect. Press continue
20) Fill out the Airport network name and passwords and then let it go on to set up your system
You could simply use the Airport Admin Utility instead of the Airport Setup assistant to set up the airport end of things if you have an existing Airport setup of course, but I thought starting from scratch might be a good idea.
Sorry if I have left anything out, or added additional , unnecessary steps, but , like I said, I'm new to ADSL.
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