DNS resolution failing even with 8.8.8.8 DNS server

One of my work computers that is available via AWS fails to resolve via DNS. While on other WIFI connections, or if I use a website to resolve this site, everything works fine. However, every computer I have at home fails to resolve it on the command line. I have tried even connecting a Mac Mini via hard-wired ethernet directly to the comcast modem and turned off WIFI, and flushed its DNS cache and still it won't resolve.

It seems that Comcast is somehow poisoning the ARP resolution even on public / Google DNS servers.

nslookup nexus3.dev.nextworld.net 8.8.8.8

When I run this in my office, via a 3rd party VPN (not one provided by my work), it resolves, but while connected to Comcast I simply get:

Server:		8.8.8.8Address:	8.8.8.8#53Non-authoritative answer:*** Can't find nexus3.dev.nextworld.net: No answer

As seen here: https://www.nslookup.io/domains/nexus3.dev.nextworld.net/dns-records/

The server is publicly resolvable. I can't understand why it will not resolve while on the Comcast internet.

As a work-around, I have to hard-code the IP address in my `/etc/hosts` file, but this is not a good solution as the IP address does change fairly regularly.

Any idea on how to get Comcast to not block / affect DNS resolution for this site?

Responses

BruceW

Gold Problem Solver

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26.3K Messages

3 years ago

... I can't understand why it will not resolve while on the Comcast internet. ...

Comcast's DNS does resolve "nexus3.dev.nextworld.net", but they are private 10.x.y.z addresses (see https://en.wikipedia.org/wiki/Reserved_IP_addresses) that are not routable over the public Internet.:

C:\>nslookup nexus3.dev.nextworld.net 75.75.75.75

Server: cdns01.comcast.net
Address: 75.75.75.75

Addresses: 10.1.28.14
10.1.33.168
10.1.25.140

You won't be able to reach the site unless you have a direct connection to one of those private networks.

Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.

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Andrew

Not applicable

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4 Messages

@BruceW Odd, I am unable to get the same results. Not sure how my DNS resolution is failing. I've tried 3 different machines all with the same result, no resolution. Tried connecting directly to the comcast modem, to my router, etc., still unable to resolve it. I do have a Disney Circle device, but failed even after turning it off, perhaps it has corrupted something in my network? Only a full VPN (with DNS routed over the VPN too) seems to be able to resolve the DNS issues. And yes, I'm aware of the fact it is a private network (we have a VPN to access those IP addresses, but my DNS still fails with that partial AWS VPN)

nslookup nexus3.dev.nextworld.net 75.75.75.75
Server:		75.75.75.75
Address:	75.75.75.75#53

Non-authoritative answer:
*** Can't find nexus3.dev.nextworld.net: No answer

3 years ago

0

Your Home Network

Andrew

DNS resolution failing even with 8.8.8.8 DNS server

BruceW

Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.

Andrew

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