Updated 8/13/13 11:17am CST, The First Octet is now 4E: instead of 40: Also Primary MACS are no longer ending in :50+ so check MAC Address Spreadsheet for the update. Added an inexpensive wireless router/repeater that can do this right out the box, so getting this will probably be the easiest way for those having trouble. Also few minor details tweaked. And remember, attwifi as the SSID
For quick viewing:
MAC Address Spreadsheet The best source to see current settings, Now Divided into 3 pages, HomePass MAC's (with FAQ), Personal MACs (this helps user who can't change their MAC), and Hardware links
HOW-TO Have a homemade Streetpass Relay GBAtemp sticky Probably the best place to ask for help at this point.
Over at this GBAtemp thread (moved to top of post), we've came up with a way to fool our routers to behave like Streetpass Relay Stations and we're pulling Streetpass tags from other 3DS users all over the world who are using this same method. Now this isn't exactly tunneling as this works like a regular Relay Station. You get the guy or gals data who was before you and you leave your data for the next person. This isn't pretty but I'll give you the gist and hopefully some one can answer questions better than I can if you can't connect.
Ok first thing you need is an access point you can spoof the Wireless LAN MAC address of. This can include:
A SANOXY® Wireless-N Wifi Repeater 802.11N (No hacking needed. These would be great to daisy chain with you existing router setup)Product Link
An Android device like a phone that you can make a hotspot and spoof the Wireless Lan MAC. (No guides and varies by device)
A Linux box with both a wired (to internet) and Wireless (for your 3DS) connections.) Guide
MACOSX with same setup as Linux GBAtemp Post Tutorial
Somebunny and dicamarques from GBAtemps are possibly making a LiveCD of Linux so Windows users and those having difficulty can do this easier (more news to come hopefully)
OK, so most of us should know the trick to making our routers (or hotspots) Nintendo Zones, but for the unenlightened you set the SSID to a known Nintendo Zone SSID and set the security to disabled or off. The easiest SSID to use is
so set you're SSID to this with security off. If you're concerned about leaving you're security here's little rough tutorial I wrote to Furubashi about how to do this with security on your network so you're not wide open. It's far more stubborn recognizing the Nintendo Zone then just leaving you're router open for me anyways.
Next you need to spoof you Wireless LAN MAC. Your mileage may vary with this and I don't know every way to do this, but I'll tell you how I did it and it works.
I have a DD-WRT firmware flashed router. Once I've setup my Nintendo Zone, I click on the Setup Tab. The I click on the MAC Address Clone Tab. In the new screen click Enable under MAC Clone. You'll be given 2 MAC addresses. One for your router (Clone WAN MAC) and for your Wireless LAN (Clone Wireless MAC). Change your Clone Wireless MAC (ignore Clone WAN MAC) to the following MAC address:
Save changes and now your ready to Rock and Roll. Turn on your 3DS make sure you're seeing a Nintendo Zone is near by and you have Internet Access in the the top left corner of your Screen. Put your 3DS in sleep mode and usually in about 2 minutes if everything works you will have received a Streetpass. Now you're 3DS will have an 8 hour-ish cooldown period just like when you really streetpass someone or visit an actual Streetpass relay station. At this point you can restore your router settings back and disable the MAC Cloning.
15 more MACS have been setup to be used as well. Just change the Cloned Wireless MAC Address to one listed in the MAC Address Spreadsheet being maintained by/u/FatMagic. When you change it, you will not be subjected to the cool down period for the new MAC you're using, just for the MACs you've already used. Also considering delaying 5 to 10 minutes if you're going to use one MAC after another to avoid issues with repeating Mii's not wanting to pass because they're already in your queue. Or you can just unload your Plaza queue after each pass to avoid this.
If you're looking for a good router that's DD-WRT compatible: Linksys WRT54GL from Newegg, however the A SANOXY® Wireless-N Wifi Repeater 802.11N is probably a better choice at this point because it can natively do this.
Special thanks to somebunny for figuring out the Wireles LAN was the identifier (I feel terrible for forgetting this originally). duke_srg at GBAtemp for coming up with the 40:53:50:4F:4F:46 MAC address (which spells at @SPOOF in plain text, but please use the new Primaries instead of this) and /u/FatMagic (Tane at GBAtemps) for maintiaining the spreadsheet.