Proxmox VE network didnt come up after restart

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pravinfarad

Member
Sep 22, 2021
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I notice weird issues :
1. Whenever I restart my machine, I lose the network and I manually need to make it up using following command.
>>> ip link set dev enp0s25 down && ip link set dev enp0s25 up && dhcpclient -v enp0s25
without this the network is down and I am unable to ping to the proxmox server. How to resolve this issue ?
root@# ip link 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 2: enp0s25: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000 link/ether 98:90:96:ca:ce:be brd ff:ff:ff:ff:ff:ff

2. None of my VM working now. Whenever I tried to start then I am getting following error.
bridge 'vmbr0' does not exist kvm: -netdev type=tap,id=net0,ifname=tap100i0,script=/var/lib/qemu-server/pve-bridge,downscript=/var/lib/qemu-server/pve-bridgedown: network script /var/lib/qemu-server/pve-bridge failed with status 512 TASK ERROR: start failed: QEMU exited with code 1

please help to resolve the issue.
 
root@faradproxmox:~# 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 enp0s25 inet manual

auto vmbr0
iface vmbr0 inet static
address 192.168.1.50/24
gateway 192.168.1.1
bridge-ports enp0s25
bridge-stp off
bridge-fd 0
 
I really dont why the port got autoshut and I need to enable it manually which is practically not possible.
Secondly none of my VM are getting ON. do I need to format and reinstall everything ?
 
Thanks @spirit. I will try it and update you.
btw one more thing I noticed about my VM that when I removed network device from hardware of that VM then VM came up.
So something is not right with network device.
But after I tried to add the network device , again VM didnt start so definitely network device is culprit.
So please guide me how can I resolve the network device issue ?
 
dmesg seem to be ok.

when you said
"
>>> ip link set dev enp0s25 down && ip link set dev enp0s25 up && dhcpclient -v enp0s25
without this the network is down and I am unable to ping to the proxmox server. How to resolve this issue ?"

do you have another ip from dhcp (not only the static 192.168.1.50) ?
 
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