VM Internet Connectivity Issue on Proxmox 8.3.5 (Non-Enterprise)

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77777kaz77777

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Oct 21, 2024
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Hello everyone,


I'm wondering if anyone else has encountered this issue before. Since last Wednesday, I am experiencing random internet connectivity loss across all VMs on all four of my Proxmox nodes. It was working fine then randomly stopped.





I've checked the firewall rules and Proxmox configurations, and nothing seems to be blocking the connection. It's worth noting that the nodes themselves can reach the internet without any issues — it's only the VMs that are affected.


At this point, I'm not sure what else to check. Has anyone experienced something similar, or is there a known issue with the non-enterprise version (8.3.5)?


Any help or suggestions would be greatly appreciated!


Thanks in advance.
 
Last edited:
Your are not alone.
I have the same issue after a full upgrade. I have two VMs, one Windows and one Linux, and both are affected. I tried setting a static IP instead of using DHCP, and it works for a short time, but once I restart Proxmox, everything is gone again. It’s really frustrating, and I haven't found a solid fix yet.
 
Can you post the network configuration of the host:

Code: 
cat /etc/network/interfaces

As well as the VM configuration:

Code: 
qm config <vmid>

Is the firewall active? Are you sure there are no duplicate IPs in your network?

It would also be interesting to get a tcpdump from the host, at a time where traffic is not working:

Code: 
tcpdump -i any -w output.pcap
 
/etc/network/interfaces
Bash: 
auto lo
iface lo inet loopback

iface enp87s0 inet manual

iface enp89s0 inet manual

iface enp2s0f0np0 inet manual

iface enp2s0f1np1 inet manual

auto vmbr0
iface vmbr0 inet static
        address 192.168.86.200/24
        gateway 192.168.86.1
        bridge-ports enp87s0
        bridge-stp off
        bridge-fd 0

iface wlp90s0 inet manual

qm config 100
Bash: 
agent: 1
boot: order=scsi0;ide2;net0
cores: 4
cpu: host
ide2: none,media=cdrom
memory: 8192
meta: creation-qemu=9.2.0,ctime=1742150004
name: Debian
net0: virtio=BC:24:11:F2:37:7E,bridge=vmbr0
numa: 0
onboot: 1
ostype: l26
scsi0: local-lvm:vm-100-disk-0,iothread=1,size=80G
scsihw: virtio-scsi-single
smbios1: uuid=2b35e523-7f97-479c-b1b9-4256223e13c0
sockets: 1
tags: linux
vmgenid: e9139cac-06a4-4e89-a1aa-b4b09921cf70

No firewall active and no duplicate IPs in my network.
 
root@ITY-G1013-SLC04:~# cat /etc/network/interfaces
# network interface settings; autogenerated
# Please do NOT modify this file directly, unless you know what
# you're doing.
#
# If you want to manage parts of the network configuration manually,
# please utilize the 'source' or 'source-directory' directives to do
# so.
# PVE will preserve these directives, but will NOT read its network
# configuration from sourced files, so do not attempt to move any of
# the PVE managed interfaces into external files!

auto lo
iface lo inet loopback

iface eno8303 inet manual

iface eno8403 inet manual

iface eno12399np0 inet manual

iface eno12409np1 inet manual

iface eno12419np2 inet manual

iface eno12429np3 inet manual

iface ens3f0np0 inet manual

iface ens3f1np1 inet manual

auto ens6f1np1
iface ens6f1np1 inet manual

iface ens6f0np0 inet manual

auto vlan2001
iface vlan2001 inet manual
ovs_type OVSIntPort
ovs_bridge cml1
ovs_options tag=2001

auto vlan2002
iface vlan2002 inet manual
ovs_type OVSIntPort
ovs_bridge cml1
ovs_options tag=2002

auto vlan2003
iface vlan2003 inet manual
ovs_type OVSIntPort
ovs_bridge cml1
ovs_options tag=2003

auto vlan2004
iface vlan2004 inet manual
ovs_type OVSIntPort
ovs_bridge cml1
ovs_options tag=2004

auto vlan2005
iface vlan2005 inet manual
ovs_type OVSIntPort
ovs_bridge cml1
ovs_options tag=2005

auto vlan2006
iface vlan2006 inet manual
ovs_type OVSIntPort
ovs_bridge cml2
ovs_options tag=2006

auto vlan2007
iface vlan2007 inet manual
ovs_type OVSIntPort
ovs_bridge cml2
ovs_options tag=2007

auto vlan2008
iface vlan2008 inet manual
ovs_type OVSIntPort
ovs_bridge cml2
ovs_options tag=2008

auto vlan2009
iface vlan2009 inet manual
ovs_type OVSIntPort
ovs_bridge cml2
ovs_options tag=2009

auto vlan2010
iface vlan2010 inet manual
ovs_type OVSIntPort
ovs_bridge cml1
ovs_options tag=2010

auto connector
iface connector inet manual
bridge-ports none
bridge-stp off
bridge-fd 0

auto cml1
iface cml1 inet manual
ovs_type OVSBridge
ovs_ports vlan2001 vlan2002 vlan2003 vlan2004 vlan2005 vlan2010

auto cml2
iface cml2 inet manual
ovs_type OVSBridge
ovs_ports vlan2006 vlan2007 vlan2008 vlan2009

auto vmbr0
iface vmbr0 inet manual
bridge-ports ens6f1np1
bridge-stp off
bridge-fd 0
bridge-vlan-aware yes
bridge-vids 2-4094

auto vmbr1
iface vmbr1 inet manual
bridge-ports none
bridge-stp off
bridge-fd 0

source /etc/network/interfaces.d/*





args: -cpu host,+vmx
boot: order=sata1;net0
cores: 4
memory: 130000
meta: creation-qemu=9.2.0,ctime=1742393266
name: linuxmint
net0: virtio=BC:24:11:3E:30:D6,bridge=vmbr0,tag=295
numa: 0
ostype: l26
sata1: iscsi-vm-storage:138/vm-138-disk-0.qcow2,size=140G
scsihw: pvscsi
smbios1: uuid=1273634d-ed5a-4fb8-95e6-a7d3c14ddf69
sockets: 1
vmgenid: a7ddf29e-25f1-487c-a37f-99bf9d2f78c2



we are using netplan for the managament config
 
Last edited:
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