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AT&T updates firmware to block access to 1.1.1.1

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Re: AT&T updates firmware to block access to 1.1.1.1

#101
post #79

Earlier quoted context omitted.

They started blocking 1.0.0.1 and CF ipv6 DNS too. This has to be intentional.

Hmmm that's a fair point. But then why not also block 8.8.8.8?

Probably because they know they would never be able to convince anyone that it was a technical bug and not malice. A surprising number of people seem to be convinced this was unintentional.

Re: AT&T updates firmware to block access to 1.1.1.1

#102
post #71

I'd say there is a 98% chance this is a bug in some firmware and a 2% chance AT&T is intentionally trying to block Cloudflare DNS. I get why people are paranoid about ISPs blocking content and net neutrality, but let's not cry wolf prematurely. The technical details here strongly suggest a bug rather than intentional blocking of 1.1.1.1 DNS traffic.

What's that saying about not attributing to malice, what is more easily explained as stupidity or incompetence or whatever? (Occom's Razon and all that).

AT&T routers also don't let you use a 10.x address at home (possibly to prepare for carrier grade NAT, although there is an official 100.x address reserved for that; so fuck you ATT).

I'm so sick of my AT&T router/modem for various other reasons. I hate how you are required to use it for many of their offerings (including Fiber to the home).

There are a number of tools out there for putting their router behind your Linux box. Most of them configure ebtables or use scripts to forward the 802.1q authentication packets to/from the router.

Re: AT&T updates firmware to block access to 1.1.1.1

#104
post #61

Earlier quoted context omitted.

They were blocking 1.1.1.1 on some firmwares long before cloudflare's dns service started. From what I've read, the routers use it on some internal interface. It's likely incompetence, not malice. If they didn't want people using other DNS, and were willing to fuck with ip addresses they don't own to accomplish that, they'd be blackholing google's and opendns's public caching nameservers too. It might even have been…

It’s weird at&t is in such poor technical shape that they can’t control a single ip address, and then just use that. This was an organization that sustained five mines of uptime for decades. Crazy to see a fallen (or broken up) titan struggle with basic stuff. I mean, basic compared to their heyday.

If you look at the history, the current AT&T is actually Southern Bell. It got eaten by one of its children.

Re: AT&T updates firmware to block access to 1.1.1.1

#105
post #75

This is likely due to incompetence, not malice. FWIW, it’s possible to bypass AT&T’s router: https://github.com/jaysoffian/eap_proxy That said, I tried 1.1.1.1 and found I had to switch back to Google DNS since Cloudflare intentionally doesn’t support EDNS Client Subnet which was causing my AppleTV’s to have trouble loading content.

I've been meaning to try eap_proxy for a while. I've seen it mentioned several times. My ATT router doesn't get in my way enough to bother with it yet, but it still pisses me off they won't let me use a 10.x range at home.

Also I've heard that their routers report your entire network topology back when they phone home.

Re: AT&T updates firmware to block access to 1.1.1.1

#106
post #71

I'd say there is a 98% chance this is a bug in some firmware and a 2% chance AT&T is intentionally trying to block Cloudflare DNS. I get why people are paranoid about ISPs blocking content and net neutrality, but let's not cry wolf prematurely. The technical details here strongly suggest a bug rather than intentional blocking of 1.1.1.1 DNS traffic.

What's that saying about not attributing to malice, what is more easily explained as stupidity or incompetence or whatever? (Occom's Razon and all that). AT&T routers also don't let you use a 10.x address at home (possibly to prepare for carrier grade NAT, although there is an official 100.x address reserved for that; so fuck you ATT). I'm so sick of my AT&T router/modem for various other reasons. I hate how you are…

> What's that saying about not attributing to malice, what is more easily explained as stupidity or incompetence or whatever?

Hanlon's razor: https://en.wikipedia.org/wiki/Hanlon%27s_razor

Re: AT&T updates firmware to block access to 1.1.1.1

#107
post #75

This is likely due to incompetence, not malice. FWIW, it’s possible to bypass AT&T’s router: https://github.com/jaysoffian/eap_proxy That said, I tried 1.1.1.1 and found I had to switch back to Google DNS since Cloudflare intentionally doesn’t support EDNS Client Subnet which was causing my AppleTV’s to have trouble loading content.

Can you not just put the router in bridge mode and use a different sane one? In the UK Virgin forces you to use their moderately shit modem/router, but even that lets you use bridge mode.

Re: AT&T updates firmware to block access to 1.1.1.1

#108
post #62
post #43

Earlier quoted context omitted.

Whenever I've needed IP ranges for similar purposes (i.e., default IPs for container or VM internal / private networks) I've used ranges from RFC 5737 (192.0.2.0/24, 198.51.100.0/24, and 203.0.213.0/24). These are for reserved for documentation purposes, so it is highly unlikely that a customer would have these going in their own internal network. Not the best solution, but better than tying up a public /24 that we o…

We used to use RFC1918 (172.16/12 IIRC) addresses for the communication between internal nodes in a cluster-in-box system that I worked on, which worked great until we had a subnet collision on a customer's network. Leaves me wondering if link-local (169.254/16, fe80::/10) would have been a better option - while technically the customer could decide to make the external (customer-facing) network have a link-local int…

In a cluster-in-a-box scenario, you could modify the OS's network scripts to have the cluster-specific private interface start after the general LAN interface is up. Check both 10/8 and 172.16/12 to see if they're used by the public interface, and use whichever one isn't for the cluster network.

Re: AT&T updates firmware to block access to 1.1.1.1

#109
post #2

Cloudflare's CEO confirms: https://twitter.com/eastdakota/status/991718955021623296

How is this not illegal?

The routers in question are the only ones I’ve encountered that are incompatible with my home router.

Clearly, they’re discriminating against certain client devices, and were under the Obama administration too.

However, the documentation says it should work, and AT&T won’t provide support.

They’ve been getting away with this for years, so I guess plausible deniability (it is “just a bug”) can work wonders in this space.

Re: AT&T updates firmware to block access to 1.1.1.1

#110

If at&t does not provide any official explanation, what's your opinion on how people should respond. The first thing that came to mind for me is to switch over to Xfinity on my next contract cycle.

It’s not like Comcast is any better. They block ports:

https://www.xfinity.com/support/articles/list-of-blocked-por...

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