January 2011 Archives


Three different eBay sellers have all sold me USB Bluetooth adapters (at costs varying from very-cheap to brand-name-premium) with duplicate addresses*. I'm currently waiting for the third one to stop ignoring the law (and me) so that I can return the most recent purchase.

I was ready to give up and decide it was now impossible to buy genuine Bluetooth devices that comply with the Bluetooth Specification when I tried purchasing some Belkin adapters from Amazon, and it turns out that despite the increased cost these actually have unique addresses.

* Bluetooth adapters with duplicate addresses means that if you happen to be using your adapter within range of someone else who got theirs from the same manufacturer's batch, you'll get conflicts accessing devices because there will be two devices on the network with the same address. Avoid Dynamode and cheap unbranded devices.

Enumerating ip6.arpa

Based on an idea from a NANOG post I created a script to walk an ip6.arpa zone and list all IPv6 hosts.

It works surprisingly well:

$ ./ip6dnswalk.py 2620:0:1C00::/40
2620:0000:1cfe:face:b00c:0000:0000:0003 www.v6.facebook.com.
2620:0000:1cfe:face:b00c:0000:0000:0004 login.v6.facebook.com.
2620:0000:1cfe:face:b00c:0000:0000:0005 hphotos-sjc1.v6.fbcdn.net.
2620:0000:1cfe:face:b00c:0000:0000:0006 apps.v6.facebook.com.
2620:0000:1cfe:face:b00c:0000:0000:0007 m.v6.facebook.com.
2620:0000:1cfe:face:b00c:0000:0000:0008 register.v6.facebook.com.
2620:0000:1cfe:face:b00c:0000:0000:0009 check6.v6.facebook.com.
2620:0000:1cff:dead:beef:0000:0000:0000 pr01.sjc1.tfbnw.net.
2620:0000:1cff:dead:beef:0000:0000:0001 pr02.sjc1.tfbnw.net.
2620:0000:1cff:dead:beef:0000:0000:0002 bb01.sjc1.tfbnw.net.
2620:0000:1cff:dead:beef:0000:0000:0003 bb02.sjc1.tfbnw.net.
2620:0000:1cff:dead:beef:0000:0000:0004 pr02.pao1.tfbnw.net.
2620:0000:1cff:dead:beef:0000:0000:0005 pr03.pao1.tfbnw.net.
2620:0000:1cff:dead:beef:0000:0000:0006 bb01.pao1.tfbnw.net.
2620:0000:1cff:dead:beef:0000:0000:0007 bb02.pao1.tfbnw.net.
2620:0000:1cff:dead:beef:0000:0000:0008 ae0.pr01.sjc1.tfbnw.net.
2620:0000:1cff:dead:beef:0000:0000:0009 ae0.bb01.sjc1.tfbnw.net.
2620:0000:1cff:dead:beef:0000:0000:000c ae4.bb01.sjc1.tfbnw.net.
2620:0000:1cff:dead:beef:0000:0000:000d ae2.bb01.pao1.tfbnw.net.

More details and a method of preventing this are in my ip6walk git repository.

About this Archive

This page is an archive of entries from January 2011 listed from newest to oldest.

October 2010 is the previous archive.

March 2011 is the next archive.

Find recent content on the main index or look in the archives to find all content.

Content authored by myself is just my honest opinion.


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