IPV6? DNS issues

Forums › 2degrees (including Slingshot, Orcon, Flip, Stuff Fibre, MyRepublic, 2talk and Vocus) › IPV6? DNS issues - Fibre

mentalinc

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#272435 24-Jun-2020 20:06

Just checking to see if anyone else has been having DNS issues today?

I have pihole setup, but even running ping from there also leads to haphazard ping and dns results...

$ ping google.com

ping: google.com: Temporary failure in name resolution

$ ping google.com

PING google.com(syd15s15-in-x0e.1e100.net (2404:6800:4006:810::200e)) 56 data bytes

ping google.com

ping: google.com: Temporary failure in name resolution

doesn't appear to happen with ipv4

$ ping -4 google.com

PING google.com (142.250.66.238) 56(84) bytes of data.

I do appear to have two ipv6 addresses (inet6 2406....) on the interface however

Any thoughts as to why keeps dropping out?

CPU: AMD 5900x | RAM: GSKILL Trident Z Neo RGB F4-3600C16D-32GTZNC-32-GB | MB: Asus X570-E | GFX: EVGA FTW3 Ultra RTX 3080Ti| Monitor: LG 27GL850-B 2560x1440

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timmmay

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#2511723 24-Jun-2020 20:30

IPv6 on 2degrees fiber is working fine for me. I have a pi hole and my Fritzbox 7590 hands out its IPs over DHCP.

> ping google.com

Pinging google.com [2404:6800:4006:807::200e] with 32 bytes of data:
Reply from 2404:6800:4006:807::200e: time=38ms
Reply from 2404:6800:4006:807::200e: time=36ms
Reply from 2404:6800:4006:807::200e: time=39ms
Reply from 2404:6800:4006:807::200e: time=38ms

> ping -4 google.com

Pinging google.com [172.217.25.174] with 32 bytes of data:
Reply from 172.217.25.174: bytes=32 time=37ms TTL=120
Reply from 172.217.25.174: bytes=32 time=35ms TTL=120
Reply from 172.217.25.174: bytes=32 time=37ms TTL=120
Reply from 172.217.25.174: bytes=32 time=35ms TTL=120

Linux

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#2511727 24-Jun-2020 20:37

No issues on 2d IPv6 here

mentalinc

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#2511808 24-Jun-2020 21:38

Guess I start the rabbit hole of why it's not working all the time then :(

Been working for months, nothing changed to even reverse

CPU: AMD 5900x | RAM: GSKILL Trident Z Neo RGB F4-3600C16D-32GTZNC-32-GB | MB: Asus X570-E | GFX: EVGA FTW3 Ultra RTX 3080Ti| Monitor: LG 27GL850-B 2560x1440

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timmmay

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#2511809 24-Jun-2020 21:47

Try changing your DNS back to your ISP provided route - assume that's a fritbox? But running the ping on the pi hole should've worked fine.

I've been messing with my network after posting in this thread. I realised the Fritzbox was handing out multiple IPv6 addresses for the DNS server, itself first then the pihole, so I changed to using the pihole for DHCP. Now all DNS goes through the pihole. I also upgraded to pihole v5. Advantage of v5 is you can have per-client setting that means you can configure some devices not to use ad blocking.