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Mr_Maniac
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Joined: 10 Jun 2004
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 Posted: Sat Nov 02, 2024 8:57 pm Post subject: [kind of SOLVED] Suddenly problems with IPv6 ULAs |
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Hello,
since a few days, I suddenly have problems with my internal IPv6 traffic. I set up dhcp6 via dibbler quite a time ago since I wanted to have local IPv6 addresses with dynamic DNS. My server has a static address in the ULA range (fd00::/ and provides other clients with addresses in the same subnet.
This whole process worked quite fine until a few days ago. The addresses are still being given, but I can't connect between my clients/server via local IPv6 ULA at all... Name resolution works, addresses are given but trying to connect just times out (no matter from/to which machine).
I already checked ip6tables, but the ULA range is being whitelisted. I also tried to check route -6, but unfortunately, I don't exactly know how it SHOULD look like... In route -6, the local address itself is being listed and not a whole network/prefix.
Using the link local addresses works and internet via IPv6 also has no problems. Only ULA...
I may have broken something, when I accidently started dhcpcd (so the DHCP client) on my server while wanting to restart dhcpd. That really mixed up things for a short while (minutes), but after I fixed that, internal IPv6 traffic worked for a few days.
Any ideas what the problem could be or what I could check?
_________________
AMD Ryzen 5900X
64 GB DDR4 RAM
GeForce RTX 3080
Gentoo Linux (most recent stable kernel - amd64)
Windows 11 x64
Last edited by Mr_Maniac on Thu Nov 07, 2024 8:58 pm; edited 1 time in total |
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Mr_Maniac
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Joined: 10 Jun 2004
Posts: 546
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| Posted: Sat Nov 02, 2024 9:38 pm Post subject: |
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Okay... Already an update. I thought I already tried this.
I've now manually added a static route | Code: | | route -6 add fc00::/7 ethX |
on both server and client and now the connection works again... I think I only tried it on one of both machines before, so that could be why it did not work before...
But why should I suddenly have to add this route manually? I did not change any network config in the last days... Only my little fauxpas with the DHCP client on my server...
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AMD Ryzen 5900X
64 GB DDR4 RAM
GeForce RTX 3080
Gentoo Linux (most recent stable kernel - amd64)
Windows 11 x64 |
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Mr_Maniac
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Joined: 10 Jun 2004
Posts: 546
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| Posted: Thu Nov 07, 2024 8:57 pm Post subject: |
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Okay, I kind of solved it for now. IMHO it's not the most elegant solution, but as long as it works 
It seems that IPv6 routes can not be propagated via DHCP6 but via router advertisements. But I did not want to install radvd, too...
My DSL router has the ability to also assign ULAs via RA with a choosable prefix. So now I also let my router assign additional ULAs with the same prefix.
With that, my clients get two ULAs (one by RA and one by DHCP6) and the route for this prefix is being set correctly (with my router as the first hop).
_________________
AMD Ryzen 5900X
64 GB DDR4 RAM
GeForce RTX 3080
Gentoo Linux (most recent stable kernel - amd64)
Windows 11 x64 |
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