mzwaterski's profile

Frequent Visitor

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6 Messages

Wed, May 13, 2020 3:00 PM

DNS requests appear to be intercepted

In testing a DNS issue, I appear to have discovered that my DNS requests are being intercepted.  When I query a DNS server that is an authority (confirmed by performing the query with another internet provider and also confirmed by a friend who is also on Xfinity), I'm receiving a response that the answer is non-authoritative.  The other Xfinity user is using a bring your own modem.  I am using the Arris TG3482G.  Is the interception being done by Xfinity? Is this intentional?

Responses

EG

Expert

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86.5K Messages

1 y ago

Yes. It's intentional. The Comcast DNS servers are hardcoded into the firmware of the Comcast supplied gateway devices. It can't be altered.

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andyross

Silver Problem Solver

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6.8K Messages

1 y ago

And to expand: Comcast gateways not only do not let you alter the DNS servers, they intercept all DNS requests and route them to the Comcast servers. Even changing the DNS on a device will not work.

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