On 3/23/21 13:03, Konold, Martin wrote:
Hi Proxmox Users,
I learned from the Proxmox forum that appending mtu=1 to the network
definition of a virtual machine instructs the virtual ethernet device to
inherit the mtu from the corresponding bridge.
In my case
net0: virtio=FA:FF:FF:FF:FF:D8,bridge=vmbr15,mtu=1
and the bridge definition
iface vmbr15 inet static
address 10.21.15.11/24
bridge-ports enp35s0.4015
bridge-stp off
bridge-fd 0
bridge-vlan-aware yes
bridge-vids 2-4094
mtu 1400
According to my tests this seams to work indeed. The guest OS shows the
1400 mtu.
Question 1: Can the mtu=1 (magic value for auto mtu inheritance) be made > the
default?
probably not because of backwards compatibility (live-migration etc.)
but maybe we could (should?) either add it as default for
new vms in the webui, or expose it as a gui field
would you mind opening a feature request? https://bugzilla.proxmox.com
Question 2: It seams that appending mtu=1 breaks the webUI. I get
"Unable to parse network options".
thanks for reporting, i sent a patch on the devel list to fix that
Kind Regards
ppa. Martin Konold
--
Martin Konold - Prokurist, CTO
KONSEC GmbH - make things real
Amtsgericht Stuttgart, HRB 23690
Geschäftsführer: Andreas Mack
Im Köller 3, 70794 Filderstadt, Germany
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