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MyTake - Firewall 1 - Chromecast 0


Firewall 1 - Chromecast 0 
Wednesday, August 14, 2013, 9:38 PM - Hardware, Software, Security
Posted by Administrator
I unboxed my new Chromecast device yesterday. Setup was fairly straightforward, I entered my Wifi information, only to continually get an error that it "could not connect to the internet." I thought I might have has a Wifi issue, not connecting for some reason, maybe out of range or a DHCP issue. I was finally able to track it down. It turns out that it didn't like my DNS firewall. On my network I have blocked use of all DNS servers besides mine to handle problems like DNS Changer. I saw this traffic:

19:19:10.284578 IP 10.0.3.247.59034 > google-public-dns-a.google.com.domain: 57629+ A? pool.ntp.org. (30)
19:19:10.300858 IP 10.0.3.247.55306 > google-public-dns-a.google.com.domain: 6977+ A? clients3.google.com. (37)
19:19:11.300764 IP 10.0.3.247.48751 > google-public-dns-b.google.com.domain: 6825+ A? clients3.google.com. (37)


Chromecast is hard coded to use Google's Public DNS service and does not use the DNS servers provided by DHCP. Problem solved, but I had to punch a hole in my firewall specifically for Google DNS which is a little annoying.

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