[SOLVED] Host's looses connection constantely including when VM starts and VM got no internet either

Darkyere · Jul 11, 2022

I am completely new to Proxmox. I wanted to try it out to learn something new.
I usually use Virtualbox on W10 but i want to try the speed and power of KVM.

I have been really exited about this and seen a lot of videos and reviews of Proxmox.
So i really hope i can get help to make it work.

I have installed Proxmox on Debian 11 with lxqt 64bit. Following the guide on Install Proxmox VE on Debian Buster

My big problem is, when i try to create a Virtual Bridge my HOST looses networking.
It can momentarily be fixed with

Code:

systemctl restart networking

but looses its connection fast.

When trying to start a VM both HOST and VM looses connection.
So far i have spend the better of 2-3 days googling and trying myself.

But i seem to have reached the point where i have to ask for help.

# My /etc/network/interfaces looks like this

# Configured from Proxmox gui

Code:

auto lo
iface lo inet loopback

iface enp8s0 inet manual

auto vmbr0
iface vmbr0 inet static
        address 192.168.1.114/24
        gateway 192.168.1.1
        bridge-ports enp8s0
        bridge-stp off
        bridge-fd 0

As a note i can ping my local devices on LAN.
And sometimes i can ping 8.8.8.8 (Google DNS)
But i aint got no net on either HOST or VM's

I am not really aware of anything else i need to post. Just tell me what i should add and i will.

Ty for reading and having a look at my peril,
Best Regards,
Darkyere

Neobin · Jul 12, 2022

Darkyere said:
I have installed Proxmox on Debian 11 with lxqt 64bit. Following the guide on Install Proxmox VE on Debian Buster

So you used the PVE on Debian 10/Buster guide for your Debian 11/Bullseye installation?
The right guide can be found here: [1].

Also you installed PVE on a Debian with an desktop environment; not sure if this comes with another network manager which might interfere here...?

What is the output of:

pveversion -v
cat /etc/apt/sources.list
tail /etc/apt/sources.list.d/*

[1] https://pve.proxmox.com/wiki/Install_Proxmox_VE_on_Debian_11_Bullseye

Darkyere · Jul 13, 2022

Luckely enough when i posted the first post. I linked to the wrong Install Proxmox on debian.
I did actaully use the one for Debian 11 and i noticed that now since i used the sha512sum in the process.

So when u said that there might be a network manager messing with proxmox/debian setup because i installed lxqt desktop.
i figured this might have something to do with it.

I notice during the boot up of the Debian 11 that something called connman is setting up the network.
And everytime i had added a bridge to "/etc/network/interfaces" the boot process allways hanged at "waiting for connman to set up network"

That made me google "debian proxmox connman" and another guy had the same problem where he simply uninstalled and purged connman and then the bridge part worked for him.

So i have just done the same and to make sure i had a fresh network setup i rebooted.

And well whatta u know i got internet on host, VM and can acces them over my LAN.

----

Just out of curiosity if u know why this happened.

First when i booted i got this

Code:

ifconfig
       
        enp8s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        ether 1c:6f:65:d3:41:c4  txqueuelen 1000  (Ethernet)
        RX packets 14940  bytes 8006889 (7.6 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 11177  bytes 6410397 (6.1 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 31603  bytes 71420278 (68.1 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 31603  bytes 71420278 (68.1 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

vmbr0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.114  netmask 255.255.255.0  broadcast 0.0.0.0
        ether 1c:6f:65:d3:41:c4  txqueuelen 1000  (Ethernet)
        RX packets 9328  bytes 3553146 (3.3 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 4032  bytes 5127611 (4.8 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

But when i started up my first machine this tap thing appeared.

Code:

ifconfig
       
        enp8s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        ether 1c:6f:65:d3:41:c4  txqueuelen 1000  (Ethernet)
        RX packets 14940  bytes 8006889 (7.6 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 11177  bytes 6410397 (6.1 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 31603  bytes 71420278 (68.1 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 31603  bytes 71420278 (68.1 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

tap100i0: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 1500
        ether 1a:24:13:1f:36:87  txqueuelen 1000  (Ethernet)
        RX packets 4109  bytes 1077444 (1.0 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 8571  bytes 4529343 (4.3 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

vmbr0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.114  netmask 255.255.255.0  broadcast 0.0.0.0
        ether 1c:6f:65:d3:41:c4  txqueuelen 1000  (Ethernet)
        RX packets 9328  bytes 3553146 (3.3 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 4032  bytes 5127611 (4.8 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Do you know what this tap thing is ?

----

Just for reference here is the requested info

Code:

pveversion -v


proxmox-ve: 7.2-1 (running kernel: 5.15.39-1-pve)

pve-manager: 7.2-7 (running version: 7.2-7/d0dd0e85)

pve-kernel-5.15: 7.2-6

pve-kernel-helper: 7.2-6

pve-kernel-5.15.39-1-pve: 5.15.39-1

ceph-fuse: 14.2.21-1

corosync: 3.1.5-pve2

criu: 3.15-1+pve-1

glusterfs-client: 9.2-1

ifupdown: residual config

ifupdown2: 3.1.0-1+pmx3

libjs-extjs: 7.0.0-1

libknet1: 1.24-pve1

libproxmox-acme-perl: 1.4.2                                                                                                                                                                                       

libproxmox-backup-qemu0: 1.3.1-1                                                                                                                                                                                 

libpve-access-control: 7.2-3                                                                                                                                                                                     

libpve-apiclient-perl: 3.2-1                                                                                                                                                                                     

libpve-common-perl: 7.2-2                                                                                                                                                                                         

libpve-guest-common-perl: 4.1-2                                                                                                                                                                                   

libpve-http-server-perl: 4.1-3                                                                                                                                                                                   

libpve-storage-perl: 7.2-5                                                                                                                                                                                       

libspice-server1: 0.14.3-2.1                                                                                                                                                                                     

lvm2: 2.03.11-2.1                                                                                                                                                                                                 

lxc-pve: 5.0.0-3                                                                                                                                                                                                 

lxcfs: 4.0.12-pve1                                                                                                                                                                                               

novnc-pve: 1.3.0-3

proxmox-backup-client: 2.2.3-1

proxmox-backup-file-restore: 2.2.3-1

proxmox-mini-journalreader: 1.3-1

proxmox-widget-toolkit: 3.5.1

pve-cluster: 7.2-1

pve-container: 4.2-1

pve-docs: 7.2-2

pve-edk2-firmware: 3.20210831-2

pve-firewall: 4.2-5

pve-firmware: 3.4-2

pve-ha-manager: 3.3-4

pve-i18n: 2.7-2

pve-qemu-kvm: 6.2.0-11

pve-xtermjs: 4.16.0-1

qemu-server: 7.2-3

smartmontools: 7.2-pve3

spiceterm: 3.2-2

swtpm: 0.7.1~bpo11+1

vncterm: 1.7-1

zfsutils-linux: 2.1.4-pve1

----

Code:

cat /etc/apt/sources.list


# deb cdrom:[Debian GNU/Linux 11.3.0 _Bullseye_ - Official amd64 DVD Binary-1 20220326-11:23]/ bullseye contrib main


#deb cdrom:[Debian GNU/Linux 11.3.0 _Bullseye_ - Official amd64 DVD Binary-1 20220326-11:23]/ bullseye contrib main


deb http://deb.debian.org/debian/ bullseye main

deb-src http://deb.debian.org/debian/ bullseye main


deb http://security.debian.org/debian-security bullseye-security main contrib

deb-src http://security.debian.org/debian-security bullseye-security main contrib


# bullseye-updates, to get updates before a point release is made;

# see https://www.debian.org/doc/manuals/debian-reference/ch02.en.html#_updates_and_backports

deb http://deb.debian.org/debian/ bullseye-updates main contrib

deb-src http://deb.debian.org/debian/ bullseye-updates main contrib

----

Code:

tail /etc/apt/sources.list.d/*


==> /etc/apt/sources.list.d/pve-enterprise.list <==

deb https://enterprise.proxmox.com/debian/pve bullseye pve-enterprise


==> /etc/apt/sources.list.d/pve-install-repo.list <==

deb [arch=amd64] http://download.proxmox.com/debian/pve bullseye pve-no-subscription

----

Thank you for your time so far u pointed me in the right direction and i very much appreciate that.

Neobin · Jul 13, 2022

Glad you figured it out!

Darkyere said:
Do you know what this tap thing is ?

This is the virtual NIC of your VM, which connects to your bridge.

Darkyere said:
==> /etc/apt/sources.list.d/pve-enterprise.list <== deb https://enterprise.proxmox.com/debian/pve bullseye pve-enterprise

If not already done, you should disable (comment out) the enterprise repository, if you do not have a subscription. Otherwise you get an error everytime you apt update.

Darkyere · Jul 13, 2022

Thank you for the information. Now i know these tap's will appear on every host i start up.

I commented out the enterprise repo so i wont get an error on each apt update, that was actually also something i couldn't understand why.

System has been running with internet and stable for about 7 hours which is the longest it have stayed with a working internet connection with BRIDGE and VM up and running.

Thank you a lot for the the help, im excited to give Proxmox a try.
Gonna mark this a solved now.

Best regards,
Darkyere

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[SOLVED] Host's looses connection constantely including when VM starts and VM got no internet either

Darkyere

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Neobin

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Darkyere

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Neobin

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Darkyere

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