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IPv6 Routed Subnet on Proxmox (Hetzner)

lala_thlala_th Member
in Help

Hi there, someone gets the Routed IPv6 subnet working on Proxmox?

Can you please help me with this setup?

Comments

  • webcraftwebcraft Member

    If you want to use it for VMs inside Proxmox you might be out of luck because Hetzner doesn't allow you to split the IPv6 subnet on most servers.

  • RickBakkrRickBakkr Member, Patron Provider, LIR
    edited July 2022

    iirc they route the /64 on the second IP (::1).

    Thus change netmask on the physical interface to a /127, and set a different IP with /64 subnet mask on the bridge. You can then use all IPs in the /64 , except for the /127, on VMs. The IP you set on the bridge is your gateway (as seen from within the VM).

    Edit: I found this config working on one of my Proxmox nodes in Hetzner;

    Feel free to take some inspiration :-)

    iface enp2s0 inet6 static
  address 2a01:4f8:FF:FFFF::2
  netmask 128
  gateway fe80::1

...

iface vmbr0 inet6 static
        address 2a01:4f8:FF:FFFF::2
        netmask 64
    Thanked by 2lala_th Abd
  • meditatingsurgeonmeditatingsurgeon Member

    Hi, i've got a /29 subnet going with Hetzner. Their Proxmox configurations guide are actually quite good in that you can copy and paste and replace just the Network interface name and IP addresses. You have to set routes when you configure the vmbr0 bridge and then you also have to add routes to the corresponding host machine - definitely for the VM's but also for the LXC containers even if you can SSH into the container.
    The Promox guide gives the instructions for /etc/network/interfaces but if the guest machine is using Netplan then you have to replace 'pointopoint' with on-link in the Netplan configuration. Like so
    routes:
    - to: 0.0.0.0/0
    via: (Your guest main IP address)
    on-link: true
    Make sure you get the tabs correct in the Netplan.
    When you have configured the Netplan enter 'neplan try' in the command line to see if it works before rebooting etc.
    Hope this helps and best of luck

  • AbdAbd Member, Patron Provider
    edited July 2022

    iirc they route the /64 on the second IP (::1).

    Thus change netmask on the physical interface to a /127, and set a different IP with /64 subnet mask on the bridge. You can then use all IPs in the /64 , except for the /127, on VMs. The IP you set on the bridge is your gateway (as seen from within the VM).

    Edit: I found this config working on one of my Proxmox nodes in Hetzner;

    Feel free to take some inspiration :-)

    iface enp2s0 inet6 static
  address 2a01:4f8:FF:FFFF::2
  netmask 128
  gateway fe80::1

...

iface vmbr0 inet6 static
        address 2a01:4f8:FF:FFFF::2
        netmask 64

    We use same ^ I can confirm it works

  • brejskibrejski Member

    I made it another way (IPs anonymized):

    auto eth0 inet static

auto vmbr0
iface vmbr0 inet static
        address 192.168.59.84/24
        gateway 192.168.59.1
        post-up ip -6 a a fe80:2a03:2222::/64 dev vmbr0
        post-up ip -6 r a default via fe80:2a03:2222::1
# IPv6
        bridge_ports eth0
        bridge_stp off
        bridge_fd 0
  • meditatingsurgeonmeditatingsurgeon Member

    Sorry - re: earlier post - I didn't register the IPV6 bit! I was just a little enthusiastic having just cracked it!

  • lala_thlala_th Member

    @RickBakkr @Abd
    any idea?
    https://paste.ee/p/XTGi5#7OJq1EA_zuG4Z9y1Cwn7KEGZJVKnKTAb

  • RickBakkrRickBakkr Member, Patron Provider, LIR

    @lala_th said:
    @RickBakkr @Abd
    any idea?
    https://paste.ee/p/XTGi5#7OJq1EA_zuG4Z9y1Cwn7KEGZJVKnKTAb

    Looks fine. Are the subnets correct, and did you enable v6 forwarding in sysctl?

  • lala_thlala_th Member
    edited July 2022

    @RickBakkr Yeah, but no lucky :(

  • AbdAbd Member, Patron Provider
    edited July 2022

    @lala_th said:
    @RickBakkr @Abd
    any idea?
    https://paste.ee/p/XTGi5#7OJq1EA_zuG4Z9y1Cwn7KEGZJVKnKTAb

    does the IPv6 work on host node ?

    also,
    echo 1 > /proc/sys/net/ipv6/conf/all/proxy_ndp
    echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
    echo 1 > /proc/sys/net/ipv6/conf/default/forwarding

  • lala_thlala_th Member

    @Abd said:

    @lala_th said:
    @RickBakkr @Abd
    any idea?
    https://paste.ee/p/XTGi5#7OJq1EA_zuG4Z9y1Cwn7KEGZJVKnKTAb

    does the IPv6 work on host node ?

    also,
    echo 1 > /proc/sys/net/ipv6/conf/all/proxy_ndp
    echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
    echo 1 > /proc/sys/net/ipv6/conf/default/forwarding

    Unfortunately not. Can I PM you or @RickBakkr ?

  • AbdAbd Member, Patron Provider

    @lala_th said:

    @Abd said:

    @lala_th said:
    @RickBakkr @Abd
    any idea?
    https://paste.ee/p/XTGi5#7OJq1EA_zuG4Z9y1Cwn7KEGZJVKnKTAb

    does the IPv6 work on host node ?

    also,
    echo 1 > /proc/sys/net/ipv6/conf/all/proxy_ndp
    echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
    echo 1 > /proc/sys/net/ipv6/conf/default/forwarding

    Unfortunately not. Can I PM you or @RickBakkr ?

    Yeah. :)

  • RickBakkrRickBakkr Member, Patron Provider, LIR

    @lala_th said: Unfortunately not. Can I PM you or @RickBakkr ?

    If our good pal Abdullah can't help, please DM me for my SSH key and I'll configure it for you free of charge :-)

    Thanked by 1Not_Oles
  • zzzshanshanzzzshanshan Member

    See it in https://kinpika.org/422

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