No Internet / Domain Name System "Broken"

Networking
1

Hi Community, i have to come back with a Problem what i had some time ago.
See post below (no Internet because of broken Domain Name System):

Iam facing the same issue again.
But i can not solve it. (vodafone Kabel Modem in Bridge Mode)
This is how it looks:

1
1756×207 5.74 KB

I tried follow:

  • turn off Vodafone Kabel Modem (2 minutes - 60 minutes)
  • switch from Bridge, to non Bridge and Back with enough time to boot and sync
  • reinstall IPFire to newest version
  • turned off / restarted several times with different sequences IPFire and Vodafone Modem
  • changed the DNS to TCP / TLS
  • changed back to Provider DNS as UDP

After spending a complete day i have no idea anymore how to fix.
Does someone have an idea?

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21431×630 36.9 KB

Thanks!
BR
Wuslor

2

Can you ping the name servers 1.1.1.1 or 8.8.8.8?

3

Keep TLS, no need for UDP.

Seems like it’s the same problem I had with my VF cable connection → DHCP client on red0 won't reassign IP upon reconnection - #25 by angrytux

I named it check_red.sh and a cronjob checks if red is down. If that’s the case ipfire handles a reconnect. Cronjob: */15 * * * * /root/check_red.sh

It takes a few minutes and all works again, including dns.

1 Like
4

No, it says unreachable
2

5

Your dns servers aren’t correct for dns over tls too. You need an ip and the tls host name.

Example:

dns
dns987×277 18.9 KB

1 Like
6

Hi, thanks for the feedback.
Looks like is a VF problem… had this in the past but not so extreme like.
Somehow it always worked after view times

I made it in the console manual:
dhcpcd -k red0
waited 60 sec
dhcpcd -n red0

still not working :frowning:
And i changed back to TLS.

7

No, thats correct:
example for one of my DNS Servers

1
1955×250 12.1 KB

8

If you do the red restart sequence you should get messages on the console and/or in /var/log/messages.
If the ping to the servers isn’t possible, I think there is problem on the IPFire-modem connection or in the modem itself.
Does the modem ( VF router in bridge mode ) signal successful connection to the provider network?

9

When i connect my laptop and restart the modem i get a DHCP and able to have internet access (bridge mode).
Therefore i beleive the modem is ok.
In the morning i turned the bridge off, everything works fine, too.
But i turned it of course back.

Still same issue

Last step says DNS not functioning, before the OK overrides
3

10

Is there any idea from someone?

I think i go back to 173.
How can i find the old versions of ipfire?

Thanks

11

Here is CU 173:
https://mirror1.ipfire.org/releases/ipfire-2.x/2.27-core173/

Installing this will wipe your drive so make sure you have a backup on a separate hard drive.

1 Like