Re: Debian VMs on a routed libvirt ULA network are not exchanging neighbor sollicitations with the host
Hi Mathieu
On Tue, Mar 16, 2021 at 10:23:15AM +0100, Mathieu Baudier wrote:
> What I can observe is that:
> - Neighbor sollicitations between the host and the CentOS VMs are being exchanged regularly
> - With the Debian guest:
> - Neighbor sollicitations are exchanged when the VM is rebooted
> - Afterwards they are not exchanged...
> - ... unless one explicitly pings the guest from the host on this internal ULA address
> (then, one can see the echo packets, but also some routerneighbor sollicitations)
You need periodic router advertisements to refresh prefix infos. How
are you generating those?
> iface br0 inet6 static
> bridge_ports enp1s0f0
> address 2001:XXXX:XXXX:XXXX::/56
You should always use /64 on an ipv6 network.
> iface enp1s0 inet6 static
> address 2001:YYYY:YYYY:YYYY:YYYY:YYYY:YYYY:YYYY/64
> post-up ip route add YYYY:YYYY:YYYY:YYYY:YYYY:YYYY:YYYY:ff dev enp1s0
> post-up ip route add 2000::/3 via 2001:YYYY:YYYY:YYYY:YYYY:YYYY:YYYY:ff dev enp1s0
> pre-down ip route del 2001:YYYY:YYYY:YYYY:YYYY:YYYY:YYYY:ff dev enp1s0
> pre-down ip route del 2000::/3 via 2001:YYYY:YYYY:YYYY:YYYY:YYYY:YYYY:ff dev enp1s0
This does not match your description. Please don't change ip addresses
if you are searching for problems.
Bastian
--
We have phasers, I vote we blast 'em!
-- Bailey, "The Corbomite Maneuver", stardate 1514.2
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