Guest VM network not working when host is using balance-rr bonding and 2 active interfaces

[Fatz]

I will try and find time to dabble with the above setting on .102, but i'm in quite a rush to get this machine in to use for some tasks.

I can say though, that the 6.2 kernel (6.2.6-1-pve) seems to be working for me without issue, details are in the bugzilla thread.

 

[john12]

Not exactly solved.
"bridge_ageing 0" solves the issue of DHCP not working and/or network suddenly freezing on the VMs, but it turns vmbr0 into a hub (packets in the same VLAN are visible between machines on the same physical host)
"bridge-disable-mac-learning 1" brings us back to square 1 (DHCP doesn't work).

Details: https://forum.proxmox.com/threads/using-2-nics-in-bonding-mode.124472/post-542990

 

[yonoss]

I am seeing the same problem in proxmox 8.0.3:
m:~# pveversion
pve-manager/8.0.3/bbf3993334bfa916 (running kernel: 6.2.16-3-pve)

 

[kennychennetman]

I got the exact same problem with v8.1.10(kernel 6.5.13-3pve)

note:
guest HDCP doesn't work with bonding in RR mode, but works fine in LACP

 

[SteveCliff]

Just trying this out now and getting exactly the same issue

Proxmox v8.2.4 (kernel 6.8.8-3-pve)

Purely by chance I am only running 1 x VM each on these nodes (it's a test K3s cluster) so I don't think turning vmbr0 in to a hub matters too much .... but would definitely like to be able to find a better way around the issue

Note: The reason I chose balance-rr is purely for speed - AFAIK it's the only bonding type that gives you the maximum speed, e.g. 2 x 2.5Gbit NICs is pushing through around 4-4.2Gbps host-to-host.

 

[DarthDepa]

Hi. Same issue here, on a single node instance of Proxmox 8.3.0 and kernel 6.8.12-2-pve and 1 VM (with Ubuntu 24.04 server).
Works perfectly with a single NIC up, without special "artifact" on the switch side (no LACP, for example) with a bridge configured directly in Proxmox (vmbr2), but when using a bonding "balance-rr" with two NIC up only hypervisor network traffic is correctly routed (vmbr1).
No traffic from VMs (except for host-to-host between VM and host).
In my use case both the host and the VM have static IP addresses.

auto lo
iface lo inet loopback

auto enp51s0f1
iface enp51s0f1 inet manual

auto enp69s0f1
iface enp69s0f1 inet manual

auto eno145
iface eno145 inet manual

auto bond1
iface bond1 inet manual
        bond-slaves enp51s0f1 enp69s0f1
        bond-miimon 100
        bond-mode balance-rr

auto vmbr1
iface vmbr1 inet static
        address 10.72.74.1/32
        bridge-ports bond1
        bridge-stp off
        bridge-fd 0

auto vmbr2
iface vmbr2 inet static
        address 10.72.74.100/32
        gateway 10.72.74.254
        bridge-ports eno145
        bridge-stp off
        bridge-fd 0

Any ideas?
It's a fresh and simple installation.
Thanks.