IPv4 AND IPv6 on Online Dedi w/ Proxmox

jaypeesmith

After beating my head repeatedly on the same rock, I am reaching out for help. I have an Online.net dedi (recent special, of course). It's running Proxmox and I have some failover IPv4s. IPv4 is working just fine with the VM I've set up on it so, no problems there.

Using instructions I've seen here and elsewhere, IPv6 is working on the host node. However, I have tried everything to get IPv6 working on the VM (KVM instance) and, I can't get it to ping out. I was wondering if anyone has been successful doing this (using both IPv4 and IPv6). Every tutorial/solution I have seen seems to be for IPv6-only configurations.

Thanks in advance for any help offered.

Lunar

Not sure how IPv6 works with online.net but have you tried putting this in /etc/sysctl.conf

net.ipv6.conf.all.forwarding=1

k0nsl

No success adding IP with ip?

elgs

Did you configure a bridge on your host node?

jaypeesmith

@k0nsl said:
No success adding IP with ip?

Well, here's what I did (on the KVM instance -- X's just to mask the IP)

iface ens18 inet6 static
      address 2001:bc8:XXXX:XX1::
      netmask 64
      post-up /sbin/ip -f inet6 route add 2001:bc8:XXXX:XX0::1 dev ens18
      post-up /sbin/ip -f inet6 route add default via 2001:bc8:XXXX:XX0::1
      pre-down /sbin/ip -f inet6 route del default via 2001:bc8:XXXX:XX0::1
      pre-down /sbin/ip -f inet6 route del 2001:bc8:XXXX:XX0::1

when I ping the interface, I see that it's configured:

root@myvm:~# ping6 ::
PING ::(::) 56 data bytes
64 bytes from ::1: icmp_seq=1 ttl=64 time=0.014 ms
64 bytes from ::1: icmp_seq=2 ttl=64 time=0.025 ms
64 bytes from ::1: icmp_seq=3 ttl=64 time=0.025 ms

However, when I try pinging outside, I get nothing.

root@myvm:~# ping6 ipv6.google.com
PING ipv6.google.com(par03s14-in-x0e.1e100.net) 56 data bytes
^C
--- ipv6.google.com ping statistics ---
18 packets transmitted, 0 received, 100% packet loss, time 16999ms

jaypeesmith

@Lunar said:
Not sure how IPv6 works with online.net but have you tried putting this in /etc/sysctl.conf

net.ipv6.conf.all.forwarding=1

I did. However, after doing so, it seems like my IPv6 setup on the host would cease to work.

jaypeesmith

@elgs said:
Did you configure a bridge on your host node?

Do you mean in addition to the one created via the Proxmox install? No, I didn't. Perhaps I am just spoiled by OVH. Getting IPv6 working there is a breeze.

elgs

Please pates your /etc/network/interfaces, and perhaps we can help you.

PrincessOfCats

@jaypeesmith said:
After beating my head repeatedly on the same rock, I am reaching out for help. I have an Online.net dedi (recent special, of course). It's running Proxmox and I have some failover IPv4s. IPv4 is working just fine with the VM I've set up on it so, no problems there.

Using instructions I've seen here and elsewhere, IPv6 is working on the host node. However, I have tried everything to get IPv6 working on the VM (KVM instance) and, I can't get it to ping out. I was wondering if anyone has been successful doing this (using both IPv4 and IPv6). Every tutorial/solution I have seen seems to be for IPv6-only configurations.

Thanks in advance for any help offered.

Interesting.

Have you tried https://forum.online.net/index.php?/topic/4729-howto-ipv6-using-dhclient-for-ubuntu/#entry30969 ?

Works fine after adding my DUID.

jaypeesmith

@ALinuxNinja said:

Interesting.

Have you tried https://forum.online.net/index.php?/topic/4729-howto-ipv6-using-dhclient-for-ubuntu/#entry30969 ?

Works fine after adding my DUID.

Thanks but, is this a setup for the host node or the VM? I have it working on the host node but not inside a VM.

PrincessOfCats

@jaypeesmith said:

@ALinuxNinja said:

Interesting.

Have you tried https://forum.online.net/index.php?/topic/4729-howto-ipv6-using-dhclient-for-ubuntu/#entry30969 ?

Works fine after adding my DUID.

Thanks but, is this a setup for the host node or the VM? I have it working on the host node but not inside a VM.

Yep, just add
net.ipv6.conf.vmbr0.accept_ra = 2 to /etc/sysctl.conf on host node and reload with sysctl -p

Note that I use different ipv6 subnets on my VM and Proxmox and the VM is bridged to vmbr0

jaypeesmith

@ALinuxNinja said:

@jaypeesmith said:

@ALinuxNinja said:

Interesting.

Have you tried https://forum.online.net/index.php?/topic/4729-howto-ipv6-using-dhclient-for-ubuntu/#entry30969 ?

Works fine after adding my DUID.

Thanks but, is this a setup for the host node or the VM? I have it working on the host node but not inside a VM.

Yep, just add
net.ipv6.conf.vmbr0.accept_ra = 2 to /etc/sysctl.conf on host node and reload with sysctl -p

Note that I use different ipv6 subnets on my VM and Proxmox and the VM is bridged to vmbr0

I'll give it a shot. Thanks again.

jaypeesmith

@ALinuxNinja just wanted to say thanks. I finally got it working (after I realized that I needed to create /64 subnets to use in my virtual machines).

PrincessOfCats

@jaypeesmith said:
@ALinuxNinja just wanted to say thanks. I finally got it working (after I realized that I needed to create /64 subnets to use in my virtual machines).

No problem, glad i could help