[SOLVED] Can't get ipv6 on vm (debian) working

[loininger]

Hello,

I'm trying to get a public ipv6 on my debian vm, I am new to proxmox.

I have got a dedicated server from servdiscount, they provide me with a ffff:ffff:ffff:ffff::/64 ipv6 net. I want to use one, or more, ipv6 on my virtual machine.
therefore I followed a tutorial from hetzner, which got my ipv4 working, but not my ipv6 unfortunately.

Here is what I did:

on the proxmox host system I edited the /etc/sysctl.conf:
net.ipv4.ip_forward=1
net.ipv6.conf.all.forwarding=1

also on the proxmox host system I edited
/etc/network/interfaces:

iface enp1s0f0 inet6 static
address ffff:ffff:ffff:ffff::2
netmask 128
gateway fe80::1


iface vmbr0 inet6 static
address ffff:ffff:ffff:ffff::3
netmask 64
up ip -6 route add ffff:ffff:ffff:ffff::/64 dev vmbr0



on the virtual machine I did:


iface ens18 inet6 static
address ffff:ffff:ffff:ffff::101/64
gateway ffff:ffff:ffff:ffff::3


this is the link to the tutorial: https://community.hetzner.com/tutorials/install-and-configure-proxmox_ve/de (sorry its in german, i followed the chapter "Netzkonfiguration".

interesting:
from my proxmox host, I can ping reach the ::101 ipv6 of my vm debian.
But from my debian vm, I can not ping the ::2 that I assigned to my proxmox host.

also from my proxmox host everything else seems fine (ping google etc), but from my debian vm I can not go outside obviously.

Also from different hosts as in my dialup, I can not reach the debian vm via ipv6, but I can reach the proxmox host.

I figured it must have something to do with the settings on my vm system?

I find it strange that my proxmox can actually reach the ::101ipv6 that I assigned on my debian-vm /etc/network/interfaces ..

Well, I'd be thankful if you would have an idea, or a good tutorial?

I would also already be satisfied to only assign one working ipv6 to my virtual machine, even though the tutorial assigns a whole subnet to it, which is not necessary.

Thank you!

 

[loininger]

Maybe this is helpful to others: I fixed it by changing my default interface that:

my /etc/network/interfaces on my proxmox-host looks like this now:

iface enp1s0f0 inet manual
auto vmbr0
#IP-V4-configuration:
iface vmbr0 inet static
address IP-ADDRESS-OF_HOST/32
gateway GATEWAY-IP
bridge-ports enp1s0f0
bridge-stp off
bridge-fd 0
pointopoint GATEWAY-IP
up ip route add STATIC-IP-FOR-GUEST/32 dev vmbr0
#ipv6 configuration:
iface vmbr0 inet6 static
address ffff:ffff:ffff:ffff::1/64
up ip -6 route add fe80::1 dev vmbr0
up ip -6 route add default via fe80::1 dev vmbr0
down ip -6 route del default via fe80::1 dev vmbr0
down ip -6 route del fe80::1 dev vmbr0



my /etc/network/interfaces on my proxmox guest looks like this for ipv6:
allow-hotplug ens18
iface ens18 inet6 static
address ffff:ffff:ffff:ffff::4
netmask 128
gateway ffff:ffff:ffff:ffff::1

(for ipv4 by the way its like this

iface ens18 inet static
address STATIC-PUBLIC-IP-ADDRESS-FOR-GUEST
netmask 255.255.255.255
pointopoint IP-ADDRESS-OF-PROXMOX-HOST
gateway IP-ADDRESS-OF-PROXMOX-HOST



also, additionally, for virtual machines that do not get a static public IP, but a private 192.168... IP,
I add two interfaces (vmbr0 and vmbr1) in the proxmox gui,
then I use vmbr0 for IPV6, and vmbr1 to assign a IPv4 192.168... IP for the private subnet.