Today in our newest take on “older technology is better”: why NAT rules!

  • Thiakil
    link
    fedilink
    arrow-up
    1
    ·
    6 months ago

    Point is, you should be able to have them have both. Or stick a reverse proxy in front that can translate. Unless they’re somehow meant to be directly internet reachable the public addresses could be autogenerated

    Full disclosure though I don’t know anything about kubernetes.

    • Justin@lemmy.jlh.name
      link
      fedilink
      English
      arrow-up
      1
      ·
      6 months ago

      Yeah, I wonder if there’s any proposals to allow for multiple IPV6 addresses in Kubernetes, it would be a much better solution than NAT.

      As far as I know, it’s currently not possible. Every container/Pod receives a single IPv4 and/or IPv6 address on creation from the networking driver.

      • Thiakil
        link
        fedilink
        arrow-up
        2
        ·
        6 months ago

        Even if you give it multiple ip6 cidrs to allocate?

        • Justin@lemmy.jlh.name
          link
          fedilink
          English
          arrow-up
          1
          ·
          6 months ago

          I haven’t really looked into it, but it doesn’t seem like it.

          Heres the documentation about having multiple cidr pools in one cluster with the Cilium network driver, and it seems to imply that each Pod only gets one IP.

          https://docs.cilium.io/en/stable/network/concepts/ipam/multi-pool/

          There’s something called Multus that I haven’t looked into, but even then it looks like that is for multiple interfaces per Pod, not multiple IPS per interface.

          https://github.com/k8snetworkplumbingwg/multus-cni

          Containers are just network namespaces on Linux, and all the routing is done in iptables or ebpf, so it’s theoretically possible to have multiple IP addresses, but doesn’t look like anybody has started implementing it. There’s actually a lot of Kubernetes clusters that just use stateful IPv6 NAT for the internal Pod network, unfortunately.