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Anyone self-hosters using IPv6 internally with k8s/k3s? (lemmy.ca)

submitted 2 years ago by [email protected] to c/selfhosted

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Just wondering how many of us use ipv6 for our local hosts, as with my router upgrade, my ISP only allows me to have 253 IP ipv4 addresses (and I don't want to have to buy a new router/gateway, a 10gbe router/gateway is expensive).

Anyway, do you guys use statically assigned ULA addresses? Statically assigned global addresses? DHCPv6? SLAAC? What do you guys do for DNS resolution, avahi/mdns everywhere (given that ipv6 addresses seem to change all the time).

I've currently mostly gotten ipv6 working (dual stack) on machines I touch, my my k3s cluster is out of commission until I can figure out a way to not have them consume any precious ipv4 addresses.

I'm not even sure what prefix I want to choose for the cluster / service CIDR, should I be using a ULA or the one specified https://docs.k3s.io/installation/network-options#dual-stack-ipv4--ipv6-networking, 2001:cafe:42::

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[–] [email protected] 6 points 2 years ago (5 children)

I might sound naive, but are you talking about a homelab that is running more than 253 separetly networked machines, virtual or otherwise? I personally am only running a dozen or so with all my Pis and VMs as everything else is just port forwarded containers on those hosts. My understanding was that ipv6 was for better public facing IPs, since on LAN ipv4 offers a few thousand IPs for private use.

[–] lue3099 1 points 2 years ago* (last edited 2 years ago)

Na IPv6 goes back to what ipv4 was when there isn't a public and private range. Private ranges were due to ip exhaustion. NAT is then used.

With ipv6 you subnet your Lan with ipv6 delegate range from your ISP. Basically it's like subnetting your lan with a public ipv4 range. No nat required. As a firewall is used to stop packets not NAT. Also ipv4 RFC1918 doesn't provide a few thousand for private, it provides 17 million.

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