http://groups.google.com/groups?....>You're going to be interested in the second half of that post. I actually just got my own adapter today (lik-sang has them back in stock for 119 USDollar) and spent the entire day figuring it out (I got it working so don't fret, stick with it!).
The first thing I have to tell you is to make absolutely sure you have it plugged in securely. I made this mistake already. It was plugged in enough to cause my hub light to come on (the light only comes on whenever a game or software in the DC needs the adapter by the way) but when I ran Quake 3A it kept giving me dial-up options instead of lan options. So make sure sure sure you get connected good.
Another tricky issue is where in internal memory us-developed and japan-developed online games store their network configuration information. Games developed in japan use different space than the us games. At least that's what I've read so far today, which has proven true in most of my cases.
Now, on to actually testing your bba. I run win2k server, but I use Internet Connection Sharing (ICS is the acronymn if you want to search on it). Assuming you're able to boot up the passport (I had to use utopia to boot it), that link I gave you is pretty accurate as far as which menu items correspond to which network settings. The part about pushing "down" 4 times isn't (it's actually like 5 or 6). At the main passport menu (where the tv drops down), just move the arrow over the option that gives you the 4 DC controller buttons (2nd from the bottom I think) and hit A. Now you can hit "down" 4 times (3rd from the bottom) and hit A.
Now you're in the network configuration and can follow the directions in the above link (starting at Menu 1). Most of the following screens have the two very bottom buttons as Back and Forward. When you get to the end of this process you'll be at a screen with 3 DC icons; choose the leftmost and hit A, then hit A again when you see the little dude waving the sign (One newsgroup article said he's warning you a password won't be saved... it's all Kanji to me so I have no idea.)
The configuration I used? I tried a whooooole bunch in the 7 hours I spent with the thing not plugged in right. If you're using ICS or DHCP you basically don't need anything, just pop in a bba enabled game and go (I only tested quake 3 so far, bomberman online gives me errors).
If you're using static IP, you pretty much have to configure everything. The IP I usually use is 192.168.0.x, x being in the range of 0-254 as 1 is often reserved for the ICS or DHCP machine, and 255 is used for broadcasting (DHCP uses this, I believe). Gateway for me was the ip address of the ICS or DHCP machine (I tried using both ICS and DHCP to route the connection and they both worked). Subnet (or netmask, or subnet netmask) was 255.255.255.0, indicating that the only portion of an address that will change on my network takes place in the last octet, or the .0 portion. I'm no networking guru but that's how I understand it. DNS settings I set to match those that my ISP gave me, although I'm not sure what you could do if you don't have those.
Menu 3 and 4 I didn't bother with. I think there's a 5th one too. Mine had sega of japan's url listed, so I just skipped past it too.
After saving you should be back at the screen where you selected the network options, you can just hit B here to get back to the main menu (with the Tv). Now choose the very bottom option to test your connection by using the passport's browser. If you get a (dsa;ljf;aksjdf;ljasldjf URL ;LFDASJKFL;J) error - notice the URL in the middle of the gobbledegook- or a (f;ldkajsf;lkdajsf DHCP a;lsdjflasjd) error - notice the DHCP in the middle of the gobbledegook- , then something's wrong. Otherwise you should be looking at Sega of Japan's site.
Some games also do their own network configuration (Quake 3 I know for sure has this because I tested it, Unreal and PSO v2 are known for this as well). So if you've got quake 3 or one of the others you shouldn't even need the passport. Quake 3, upon selecting an internet game, will change the config screen to lan options instead of dial-up if it detects the bba adapter connected. From there you can save your settings to the internal memory of the DC for use with other bba enabled games.
Whooo that was a mouthful, hope that helps.
Sorry for the long post everybody.