[SOLVED] virtual machine connectivity issue on Proxmox

[Spart]

I'm having a problem with Proxmox, more specifically with my Debian virtual machines not having access to the Internet. I verified that Proxmox can ping to 8.8.8.8 as well as the gateway, and everything seems to be working fine there. However, when I launch a virtual machine, it cannot connect to the Internet.

Here is some additional information:

-I use Proxmox version 8.2.2

cat /etc/resolv.conf
search home
nameserver 192.168.1.1

root@pve:~# cat /etc/network/interfaces
auto lo
iface lo inet loopback

auto enp0s3
iface enp0s3 inet manual

auto vmbr0
iface vmbr0 inet static
address 192.168.1.61/24
gateway 192.168.1.1
bridge-ports enp0s3
bridge-stp off
bridge-fd 0

source /etc/network/interfaces.d/*

I would also like to point out that I am new to using Proxmox, so any additional explanations or instructions would be greatly appreciated.
Thank you for your understanding and help!

Thank you in advance for your assistance!

 

[Spart]

up

 

[UdoB]

If you want to be able to use IPv4 (and ping 8.8.8.8 is IPv4) you need to give your guest an IPv4 address. The third screenshot shows only a IPv6 one.

Something like "ip addr add 192.168.1.123/24 dev ens18 && ip route add default via 192.168.1.1" may be sufficient for a non-persistent test. (From my mind, not verified.)

 

[Spart]

I thank you in advance for your response, I made the modifications given but the problem persists

 

[UdoB]

Okay, next round...

• you set 192.168.1.123 as the local address - fine!
• you can ping .1.61 - fine! Physical connectivity is present!
• you can NOT ping .1.1 - BAD!

So... Is 192.168.1.1 the "exit" out of this network? It should answer to "ping"! (Or it is something esoteric and blocks icmp echo requests. What kind of device is it?)

You need to find out more details about your network. Only you can do that.

What kind of router is it? Does it have a web frontend? Does it have a status page? Does is show the network configuration it serves?

On the pingable system .1.61: what is this? Also Linux? Can it ping .1.1? Can it access the internet? How is routing configured there? What gives "ip route" on that system?

 

[Spart]

-192.168.1.1 is the IP address of the 'Livebox Orange Fibre,' which acts as the main router in the network and has a web interface.
-192.168.1.61is the IP address of the Proxmox control panel interface, which is virtualized within VirtualBox. It can successfully ping both 192.168.1.1 and 8.8.8.8.


Here is a screenshot giving more detail:
ProxMox Interface

 

[_gabriel]

to confirm within guest network conf error, boot from Live Debian or Ubuntu

 

[Spart]

After following your advice, I installed Ubuntu "debian-live-12.5.0-amd64-cinnamon". I manually made some changes through the network interface, and I've made progress! I can now ping my gateway, but I still lack the ability to ping 8.8.8.8. Here's a screenshot where I made the modification:

 

[_gabriel]

gateway need set to Wired section not Loopback...

 

[Spart]

I tried to do the configuration manually but nothing works, impossible to ping anything. I don't understand except for 192.168.1.61

and I changed 192.168.1.123 to 192.168.1.49 which is also free

 

[_gabriel]

have you touched firewall rules ?

 

[Spart]

I found the problem, wow! I searched everywhere, and it just shows that perseverance always pays off! I tried disabling firewalls everywhere, but it didn't change anything. The issue was with VirtualBox. In the tutorials I followed to install VirtualBox, it wasn't mentioned at all that you needed to have multiple network interfaces, such as adapter 1 needing to be set to bridged mode and in the advanced network settings, to paravirtualization (virtio-net). Then, you need an adapter 2 in NAT. In Proxmox, you need to add vmbr0 to the bridge connection. The new interface that was added in my case is enp0s8.

source :

Install and Run Proxmox VE​

https://pve.proxmox.com/wiki/Proxmo...n_requires_VirtualBox_NIC_in_promiscuous_mode

Here are some screenshots, as my translation might not be correct.
add enp0s8 in the bridge port

 

[_gabriel]

The issue was with VirtualBox.

This information was important to write in your first post !

In the tutorials I followed to install VirtualBox, it wasn't mentioned at all that you needed to have multiple network interfaces

It's not needed at all.
Docs says you can use NAT from VirtualBox if you want an isolated network for your main network (like a nested network)
OR
if you want network "Bridged" (=Accès par pont) to your main primary network, you need to switch promiscuous mode ( = Mode Promiscuité ) from Deny (=Refuser) to Accept (= Accepter).