Igor Kromin |   Consultant. Coder. Blogger. Tinkerer. Gamer.

Recently we moved house and that meant changing internet service providers. We went with Telstra because I though it would be an easy way to get onto NBN (it's not, but that's another blog post). Since we moved from an apartment to a house I thought that I'd set my network up properly - network cabinet, patch panel, switch - the works. After getting some basic networking set up it was time to play around with settings and I though that it would be nice to check out how well Telstra's Federal Court blocking is implemented.

I went ahead and changed DNS Provider settings (Advanced options > Local Network) to 'Google' like so...
telstramodem_1.png


Then I went to a well known blocked website and to my surprise received this warning page telling me about Federal Court of Australia copyright infringement blocking...
telstramodem_4.png


Well that should not have happened since this blocking is implemented at DNS level and the Telstra Smart Modem 2 (by Arcadyan) DNS settings were just changed. At first I thought that maybe Telstra is doing something funny with DNS by not really going to Google DNS servers first, until I noticed this in my Mac's network configuration...
telstramodem_2.png




Sure I had the usual Google DNS servers (8.8.8.8 and 8.8.4.4) in there, but I also had another DNS server with an IPv6 address listed. Turned out this was the modem's IPv6 address and when I went back to the IPv6 Local Network I could see that Telstra was still listed as a provider for IPv6. Silly me for not noticing this before!
telstramodem_3.png


So there were two ways to go about this, either disable IPv6 or change the IPv6 DNS settings to Google or some other provider. I did the former.

Once the IPv6 DNS settings were changed, the website that I was trying to access earlier was no longer blocked. So that's a good lesson - when changing DNS settings, don't forget about IPv6 DNS too!

-i

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