[SOLVED] Network down after installation

[mathais86]

Hi,
I installed proxmox with this procedure : https://pve.proxmox.com/wiki/Install_Proxmox_VE_on_Debian_11_Bullseye
I'm working on a physical machine with Debian 11.
Before installing proxmox, ssh, apache and network works well.
My server IP is 192.168.1.31.

After proxmox installation, i loosed ssh, and others... When I try to ping from my proxmox machine, to my rooter (ping 192.168.1.1), I have an error : "Network is accessible".
But that's weird, because I can access to the web with mozilla (youtube, google...)

Maybe it's just a configuration problem ?
I have no a FQDN...

Thank you very much.

Here, my /etc/hosts :

Spoiler: My /etc/hosts

127.0.0.1    localhost
127.0.1.1    mathieuubuntu.home    mathieuubuntu
#I also tried to comment the line above...
192.168.1.31    monproxmox    mathieuubuntu

::1    localhost ip6-localhost ip6-loopback
ff02::1 ip6allnodes
ff02::2 ip6-allrouters

Here, my /etc/network/interfaces :

Spoiler: My /etc/network/interfaces

auto lo
iface lo inet loopback

auto enp0s31f6
iface enp0s31f6 inet manual

auto vmbr0
iface vmbr0 inet static
netmask 255.255.255.0
address 192.168.1.40
gateway 192.168.1.1
bridge-ports enp0s31f6
bridge-stp off
bridge-fd 0

Here, ip a command :

Spoiler: ip a

 

[bbgeek17]

I think you need to review the procedure and perhaps even start from scratch.
Your /etc/hosts suggest that you are using "192.168.1.31"
Your interfaces assign 192.168.1.40 to vmbr0
And your "ip a" shows that there is no IPv4 network configured at all, just some auto-configured ipv6. May be it failed to start, or may be something else is misconfigured.

---

Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

 

[mathais86]

I think you need to review the procedure and perhaps even start from scratch.
Your /etc/hosts suggest that you are using "192.168.1.31"
Your interfaces assign 192.168.1.40 to vmbr0
And your "ip a" shows that there is no IPv4 network configured at all, just some auto-configured ipv6. May be it failed to start, or may be something else is misconfigured.

---

Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

Thank you.
In /etc/network/interfaces, I changed this line :

address 192.168.1.40

TO

address 192.168.1.31

Now, I can access with ssh to my machine, and I can access to proxmox with https://192.168.1.31:8006

Do you think it was the problem on my configuration ?
Otherwise, can you help me to understand my mistake ?

 

[bbgeek17]

Do you think it was the problem on my configuration ?

yes. you had inconsistent configuration on your system.

Otherwise, can you help me to understand my mistake ?

i think you got it and already fixed it.

---

Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

 

[mathais86]

yes. you had inconsistent configuration on your system.

i think you got it and already fixed it.

---

Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

Thank you very much for your help !