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Quad9 DNS on EE

mikeliuk

ULTIMATE Member
Was just curious if anyone has noticed quad9 dns issues on EE starting in the second half of 2022?

The issue first presented itself using Android 11 Private dns where manually setting dns.quad9.net previously worked then stopped working. Obviously, an IPv4 literal cannot be used here (Android prevents it) to support IPv6.

On clients where I can set IPv4 literals, I would sometimes find 9.9.9.9 does not work but the secondary 149.112.112.112 did work, which suggested something dynamic was happening.
 
Last edited:
Was just curious if anyone has noticed quad9 dns issues on EE starting in the second half of 2022?

The issue first presented itself using Android 11 Private dns where manually setting dns.quad9.net previously worked then stopped working. Obviously, an IPv4 literal cannot be used here (Android prevents it) to support IPv6.

On clients where I can set IPv4 literals, I would sometimes find 9.9.9.9 does not work but the secondary 149.112.112.112 did work which suggested something dynamic was happening.
If you traceroute 149.112.112.112 vs 9.9.9.9 is there a difference?
 
If you traceroute 149.112.112.112 vs 9.9.9.9 is there a difference?
I think I did check that at the time but don't recall the result.

From memory, the route essentially overlapped but the impacted destination failed somewhere on the route. From memory, I think the route got out of EE's network but will need to record next time it happens again.
 
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Primary and secondary and tertiary and doesn't exist.

All DNS requests should be parallel, fastest wins, I'm using DNS.adguard.com at present
 
Primary and secondary and tertiary and doesn't exist.

All DNS requests should be parallel, fastest wins, I'm using DNS.adguard.com at present
I just mean the second IPv4 address provided.

IPv4
9.9.9.9
149.112.112.112


For example, 8.8.4.4 to go with 8.8.8.8 and 1.0.0.1 to go with 1.1.1.1

If no one else hits this, I'm probably just getting a single path failure per the hint at https://www.quad9.net/service/service-addresses-and-features/#ip
 
Primary and secondary and tertiary and doesn't exist.

All DNS requests should be parallel, fastest wins, I'm using DNS.adguard.com at present
On linux, the name servers are queried in the order they appear in /etc/resolv.conf
 
On linux, the name servers are queried in the order they appear in /etc/resolv.conf
Just run dnsmasq and make it query --all-servers then point resolv.conf at dnsmasq and it will do parallel lookups for you.

Here's the irony, most routers use dnsmasq that are based on Openwrt.
But the --all-servers option isn't available.
 
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Was just curious if anyone has noticed quad9 dns issues on EE starting in the second half of 2022?

The issue first presented itself using Android 11 Private dns where manually setting dns.quad9.net previously worked then stopped working. Obviously, an IPv4 literal cannot be used here (Android prevents it) to support IPv6.

On clients where I can set IPv4 literals, I would sometimes find 9.9.9.9 does not work but the secondary 149.112.112.112 did work which suggested something dynamic was happening.

Android 11 Private DNS setting of dns.quad9.net works fine today.

The Android 11 Private DNS setting only affect the WiFi connections.
 
@Philip.H try adguard dns using Private DNS and see if adverts are blocked on mobile by browsing the daily mail website for example.

Android 11 Private DNS setting is not just for WiFi connections
 
If you traceroute 149.112.112.112 vs 9.9.9.9 is there a difference?
Finally able to reproduce the symptoms reported. The routes seems to diverge at 10.247.89.65

Routine speed testing showed I was on a slow mast yesterday evening so I rebooted just the modem and the issue was seen on an Android 11 mobile and a Samsung Tab 8 tablet.

Currently the issue seems to be limited to
MNC 234
MCC 30
Cell ID: 3668998
eNB ID 14332
which happens to be on a university campus.

[root@x x]# traceroute -w 2 -n -m 18 9.9.9.9; date
traceroute to 9.9.9.9 (9.9.9.9), 18 hops max, 60 byte packets
1 192.168.X.1 0.333 ms 0.299 ms 0.285 ms
2 192.168.Y.1 40.506 ms 40.460 ms 40.471 ms
3 * * *
4 * * *
5 10.124.223.49 79.333 ms 79.321 ms 79.258 ms
6 10.247.87.159 79.244 ms 79.218 ms *
7 * * *
8 10.247.89.65 78.331 ms * 79.281 ms
9 * * *
10 * * *
11 * * *
12 * * *
13 * * *
14 * * *
15 * * *
16 10.247.89.65 1076.265 ms !H 1038.056 ms !H *
Sun 15 Jan 10:12:45 GMT 2023
[root@x x]# traceroute -w 2 -n -m 18 149.112.112.112; date
traceroute to 149.112.112.112 (149.112.112.112), 18 hops max, 60 byte packets
1 192.168.X.1 0.301 ms 0.276 ms 0.265 ms
2 192.168.Y.1 40.117 ms 40.127 ms 40.119 ms
3 * * *
4 * * *
5 10.124.223.53 78.817 ms 78.850 ms 78.833 ms
6 10.247.87.173 78.826 ms 78.679 ms 78.635 ms
7 * * *
8 10.247.89.65 78.716 ms * *
9 10.247.87.193 79.820 ms 79.759 ms 79.777 ms
10 87.237.20.102 79.769 ms 79.633 ms 39.754 ms
11 87.237.20.67 39.680 ms 39.702 ms 39.693 ms
12 195.66.225.238 41.533 ms 41.457 ms 41.471 ms
13 149.112.112.112 41.425 ms !X 41.441 ms !X 77.508 ms !X
Sun 15 Jan 10:12:59 GMT 2023
[root@x x]# ping -c 3 149.112.112.112; date
PING 149.112.112.112 (149.112.112.112) 56(84) bytes of data.
64 bytes from 149.112.112.112: icmp_seq=1 ttl=52 time=66.1 ms
64 bytes from 149.112.112.112: icmp_seq=2 ttl=52 time=64.10 ms
64 bytes from 149.112.112.112: icmp_seq=3 ttl=52 time=64.6 ms

--- 149.112.112.112 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 64.607/65.219/66.090/0.665 ms
Sun 15 Jan 10:20:00 GMT 2023
[root@x x]# ping -c 3 9.9.9.9; date
PING 9.9.9.9 (9.9.9.9) 56(84) bytes of data.
From 10.247.89.65 icmp_seq=3 Destination Host Unreachable

--- 9.9.9.9 ping statistics ---
3 packets transmitted, 0 received, +1 errors, 100% packet loss, time 2073ms

Sun 15 Jan 10:20:18 GMT 2023
 
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