System log flooded with IPv6 warnings

In the image of your router, the DHCP Server option does not allow you to “turn off” the button?

I can turn the button of but when I click save nothing happens :man_shrugging:

Let’s play the cards we’ve been dealt then…
We have to rule out your router as the source of the problem.

Your router probably won’t let you save changes due to incorrect configuration.

Configure your DHCP Server as follows.

DHCP Beginning Address: 2806:250:42c:b66d:0:0:0:0001

DHCP Ending Address: 2806:250:42c:b66d:ffff:ffff:ffff:fffe

Save the changes.

If it lets you save changes, try disabling the DHCP Server.

Whether it lets you disable the DHCP Server or not, any result will do for testing.

Thanks again. It wont let me save the changes.
Here is another screenshot.


The DHCP range seems invalid.
Interestingly I can ping the Link-Local Gateway Address shown in the top although it consist only of 6 blocks. But I have no experience at all with IPv6 so I don’t know how to proceed.
The support answered he will turn of IPv6 but still has not…

How about disabling IPv6 via sudo nmtui? What effect would that have?

I have an answer from my internet provider. It is originally in German and I translate it as best as I can.
As long as the modem has no IPv6 data on the LAN side, the DHCPv6 server is disabled, even if the “DHCP Server” switch suggests otherwise. This is a somewhat unfortunate presentation, but unfortunately we cannot change it even with administrator rights.
There are no DHCPv6 clients listed in the client list, which confirms that no IPv6 addresses are assigned via DHCP. The only IPv6 addresses listed are link-local IPs, which are automatically generated by each connected device. If this should lead to problems with IPv6, we recommend disabling IPv6 on the affected device.
In fact it is a Google-translation which is quite good.
So they suggest to disable IPv6 on Umbrel-Home.
This is what some web sites also recommend: when IPv6 is disabled on kernel level it should be disabled also in network manager.
Please let me know how you would proceed from here.
Thanks.

What a piece of shit technical support and infrastructure your ISP is. They have told you a half-truth based on the fact that you will not understand anything they told you to justify themselves and that you do not continue bothering them.

Anyway, as I see that you are only interested in deactivating IPv6 on your device, you only have to do what I detail here.

I hope it works for you although, as I see the configuration of your router, it is most likely that it will give you some problems.

Try it and tell me how it went…

Well, while you do the test, I’ll explain your router.

If you don’t want to know, maybe it will help some other user with the same situation.

If you look at the image of your router, it should be something like the following.

Global Gateway Address: An IPv6 provided and configured by your ISP. Yours is empty.

LAN UIPV6 Prefix: Same, based on, provided and configured by your ISP. Yours is empty.

Obviously, the DHCP Beginning Address and Ending Address cannot be configured because it must follow the pattern (Prefix) of the IPv6 provided and configured by your ISP.

Then that “On (Green/Active)” button on the DHCP Server… If it’s true that it doesn’t work, there wouldn’t be a big problem. But if the DHCP Server is working with that configuration, it’s like it will force any computer that tries to connect via DHCP to your network to use the following IPv6 address.

The problem is that there is no IPv6 address to assign to it and the router keeps forcing it to use an address that does not exist. Obviously, the client device (your umbrel, for example) tries to follow the router’s DHCP policy by entering a connection and disconnection loop because, simply, there is no address to connect to. This seems to be your case.

For this reason, it is best to stop depending on the router’s DHCP by assigning a static IP. This way, if the DHCP fails, the static IP will continue to connect.

Hi @jofraprez,
you are right about the technical support of my ISP. I look at it the same way and I asked them to present a proper solution.
Meanwhile I disabled IPv6 as per your guide above.
I did this two hours ago and so far I have no more IPv6 errors/warnings in the log.
I will watch it for another 24 hours and eventually mark it as a solution.
Thank you for your dedicated support which I indeed appreciate a lot.

I would like to add some words about Umbrel Support.
The Umbrel support has been very good when I started using it four years ago. They have been responsive and always presented a solution to a given problem.
But nowadays I rarely get a human response.
What I get (and every one else I guess) is:

  1. an automated answer: “Hey there! :wave: …Our support channels are currently quite busy”
  2. an automated message: "We’ll pick up your ticket soon "
  3. an automated message: "We’re working on your ticket "
  4. an automated message: “We’ve completed your ticket”
    Note: this message comes sometimes without any answer!!!
  5. an automated request to rate the conversation

This is all very annoying especially when running a Lightning routing node. The Bitcoin and Lightning universe has evolved a lot in the last couple of years and so the Umbrel universe has.
But the support unfortunately not!
So my rate to Umbrel support currently is :-1:

Hey @thool :wave:

I totally get the frustration, and we regret that you’ve had this experience. It’s highly likely that some of your support requests were marked as completed because they were considered to be duplicates as we tried to cope with a sudden surge in support traffic in the recent months.

That being said, you are 100% right to feel this way, and we ought to do better. :pray:

To help us help you, could you please reply on the tickets which you still need help with so we can make sure we’re responding to you in the right place about the right issue.

Thanks! :people_hugging: