Re: SDN with BGP Fabric and IPv6 Only Underlay for VXLAN

[Hannes Laimer <h.laimer@proxmox.com>]

Hey Tobias,

yes, a patch for this specifically already exists [1], and with [2] also
v6 fabrics should work.

[1]
https://lore.proxmox.com/pve-devel/20260925134050.754528-1-h.laimer@proxmox.com/
[2]
https://lore.proxmox.com/pve-devel/20261007064553.164447-1-h.laimer@proxmox.com/T/#u

On 2026-10-06 17:20, Tobias Fiebig wrote:
> Moin,
> 
> oh, and what I also noticed (discussed in the forums already ~4y ago,
> see:
> https://forum.proxmox.com/threads/sdn-wrong-automatic-vxlan-configuration-to-use-it-over-wiregaurd.106401/
> ) is that vxlan over IPv6 needs vxlan-local-tunnelip to be set to the
> local tunnel; Currently using explicit peer definitions to make this
> work, where there (at least) that is also being skipped in
> /etc/network/interfaces.d/sdn.
> 
> With best regards,
> Tobias
> 
> On Tue, 2026-10-06 at 16:46 +0200, Tobias Fiebig wrote:
>> Moin,
>> i am currently configuring a proxmox cluster that is supposed to be
>> IPv6 only and attached to an RFC8950 based L3 fabric.
>>
>> While doing so, I noticed that VXLAN zones cannot be configured on an
>> IPv6 only fabric; The reason for that is that
>>
>> /usr/share/perl5/PVE/Network/SDN/Zones/VxlanPlugin.pm
>>
>> Only checks for $current_node->{ip} in line 109.
>>
>> Subsequently, the peers and ifaceip are also set for v4 only. Adding
>> logic for ip6 fixes this.
>>
>> (dropping this to the devel list, as it is not really a
>> question/users
>> point, and should be a straight forward fix.)
>>
>> With best regards,
>> Tobias
>