[EXTERNAL] Charter DNS servers returning malware filtered IP addresses

Mon Oct 30 20:02:07 UTC 2023

On Mon, 30 Oct 2023, Livingood, Jason wrote:
> On 10/27/23, 19:01, "NANOG on behalf of Owen DeLong wrote:
>
>> If it’s such a reasonable default, why don’t any of the public resolvers (e.g. 1.1.1.1, 8.8.8.8, 9.9.9.9, etc.) do so?
>> DNS isn’t the right place to attack this, IMHO.
>
> Are we sure that the filtering is done in the default view - I would suggest the user check to ensure they don't have a filtering service (e.g. parental controls/malware protection) turned on. In my **personal** opinion, the default view should have DNSSEC validation & no filtering; users can always optionally select additional protection services that might include DNS-based filtering as well as other mechanisms.

At Quad9 they are clear that 9.9.9.9 is filtered.  Cloudflare 1.1.1.1 is 
unfiltered, 1.1.1.2 filters malware, 1.1.1.3 malware and stuff unsuitable 
for children.

I have no idea whether Charter uses one of these, some other third party, 
or their own.  We must know someone there who could tell us.

Regards,
John Levine, johnl at taugh.com, Primary Perpetrator of "The Internet for Dummies",
Please consider the environment before reading this e-mail. https://jl.ly