How I use unblock-us on Roku and/or opendns with my Comcast gateway (or your own with Comcast firmware).
The pain of using a Comcast modem and trying to use unblockus or opendns is that Comcast will not allow the Gateway’s DNS to be changed.
Explanation:
Most solutions that is have seen involve putting your gateway in full bridge mode and using your own router and Wifi. I really didn’t like this solution as that is really doubling up on hardware ( not to mention the inconvenience of resetting my router rules and wifi password on all devices).
My solution is achieved through DHCP. Â The DNS is set through the DHCP options. So we will set up our own DHCP server. Â But there is another problem. The Comcast gateway won’t let us turn off DHCP! Â So we have to change it so that it is only giving out one IP address. Â Whatever computer gets that address will not have the correct DNS settings!!! Â So make sure the correct computer gets the first (non-correct DNS) IP address by turning all other devices off while setting this up)
Solution:
1) (If you have a dedicated computer that is always on) Set up a DHCP server on your dedicated computer with a Static IP. Â I have one always on for Plex and PlayOn so that is the computer I set it up on. Â Set up a DHCP scope starting with a high ip address (like 100) and with your desired DNS settings. Stop the DHCP service. Â Go to step 3
2) (If you do NOT have a dedicated computer that is always on)Get a small device that has DHCP Server capabilities. Â I got a TP-Link TL-WR710N for ~$22 on Amazon. Â Set up a DHCP scope starting with a high ip address (like 100) and with your desired DNS settings. Â Stop the DHCP and/or turn off the TP-Link. Â (Here is my TP-Link Config for Unblock-us, username and password is Admin/unblockus15, and must be on Firmware 140922, and disable wireless in wireless settings on the TP-Link, ip of TP-Link will be 10.0.0.99)
3) After you have your DHCP server up and running log into your Comcast Gateway. Go to Connection -> Local IP Configuration. Â And change your Beginning and Ending IP address to the same IP. Â Set the DHCP Lease Time to forever.
4) Turn the device/computer on that you don’t care gets the wrong DNS.  it will get the IP you set above.
5) Start your DNS server (on the computer or the dedicated TP-Link type device).
6) Now you should be able to turn your devices back on and they should get the New IP and DNS!
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