How to DOWNGRADE PROXMOX 7 to 6

[rkaraca]

Hello, I updated my proxmox 6 to 7 , 3 days ago and my network is gone. I try to fix it but l couldnt solve the probem.
I want to downgrade the update from proxmox 7 to proxmox 6 as l was using with no problem for 2 years.
is there any1 guide me how to downgrade my proxmox 7 to proxmox 6 ?
I hope this downgrade will fix my network problem.
Thanks.

 

[Dunuin]

It isn't easy to downgrade a PVE installation. That's not a supported feature. Easiest would be to just do a PVE 6 reinstall and restore your guests.
And PVE 6 is also End of Life, so you won't receive any security patches anymore, resulting in a vulnerable PVE server. So I would highly recommend to fix your networking and get it running with PVE 7 instead.

 

[rkaraca]

It isn't easy to downgrade a PVE installation. That's not a supported feature. Easiest would be to just do a PVE 6 reinstall and restore your guests.
And PVE 6 is also End of Life, so you won't receive any security patches anymore, resulting in a vulnerable PVE server. So I would highly recommend to fix your networking and get it running with PVE 7 instead.

Hello Dunuin, thanks for your advice, however l am not very good in linux and proxmox and l couldnt find some1 who can solve the network problem on my proxmox 7, networks goes and VPS cant get network after update.
Can one 1 help me to fix my network problems here? I would be gratefull.
Thanks.

 

[elmarconi]

Hello Dunuin, thanks for your advice, however l am not very good in linux and proxmox and l couldnt find some1 who can solve the network problem on my proxmox 7, networks goes and VPS cant get network after update.
Can one 1 help me to fix my network problems here? I would be gratefull.
Thanks.

Just start giving info, so we can all join in!
Log in in on the server and start giving info:

proxmox:~# dmesg | grep eth proxmox:~# ip a proxmox:~# cat /etc/network/interfaces proxmox:~# ping 1.1.1.1

 

[rkaraca]

Just start giving info, so we can all join in!
Log in in on the server and start giving info:

proxmox:~# dmesg | grep eth proxmox:~# ip a proxmox:~# cat /etc/network/interfaces proxmox:~# ping 1.1.1.1

here are the results

dmesg | grep eth - https://prnt.sc/IuQZC8xmvszl
ip a - https://prnt.sc/z5N8HgPOSXMg
cat /etc/network/interfaces - https://prnt.sc/fwNzvFKMg0KI
ping 1.1.1.1 - https://prnt.sc/_E7wfdT9pu8P
Thanks for your nice advice and help.
best regards.

 

[elmarconi]

You have working ping so you should be reachable on https://51.81.11.97:8006 if your connecting computer is in the same network...

Comparing to my /etc/network/interfaces you could comment out the 5 lines with

pre-down and post-up

and restart networking: sudo systemctl restart networking

 

[Dunuin]

Comparing to my /etc/network/interfaces you could comment out the 5 lines with

pre-down and post-up

Without the routing of the PVE host the gateway wouldn`t be reachable, as the host address only uses a 32 CIDR.

And there is already a thread about fixing his network problems:
https://forum.proxmox.com/threads/lost-my-network-after-update.121009/

 

[rkaraca]

Without the routing of the PVE host the gateway wouldn`t be reachable, as the host address only uses a 32 CIDR.

And there is already a thread about fixing his network problems:
https://forum.proxmox.com/threads/lost-my-network-after-update.121009/

Hello Dunuin, yes l opened a topic about the networks problems as l explained there but l couldn't fix the problem with that topic.
I can reach proxmox panel for some time but my networks goes offline itself after 15-20 mins after l restart network services.
Also non of the VPS cant connect to network and internet with the previouse configurations that were working before update.
So l opened a threat here to find a solution to downgrade the update if possible.
is there anything wrong with it? I am trying to find a solution for my problem.
Thanks for any advice.

 

[elmarconi]

Without the routing of the PVE host the gateway wouldn`t be reachable, as the host address only uses a 32 CIDR.

And there is already a thread about fixing his network problems:
https://forum.proxmox.com/threads/lost-my-network-after-update.121009/

Well, that is new(s) for me.

proxmox:~# cat /etc/network/interfaces
auto lo
iface lo inet loopback

auto vmbr0
iface vmbr0 inet static
        address 192.168.1.2
        netmask 255.255.255.0
        gateway 192.168.1.254
        bridge_ports enp2s0f0
        bridge_stp off
        bridge_fd 0

and got working networking.
Is that due to the " netmask 255.255.255.0" aka /24?

 

[Dunuin]

Well, that is new(s) for me.

proxmox:~# cat /etc/network/interfaces
auto lo
iface lo inet loopback

auto vmbr0
iface vmbr0 inet static
        address 192.168.1.2
        netmask 255.255.255.0
        gateway 192.168.1.254
        bridge_ports enp2s0f0
        bridge_stp off
        bridge_fd 0

and got working networking.
Is that due to the " netmask 255.255.255.0" aka /24?

Jup, "netmask 255.255.255.0" is the same as "address 192.168.1.2/24". Both mean the PVE host is using a subnet between 192.168.1.1 and 192.168.1.255. So only those 255 IPs can be reached. Your gateway is in that range, so the PVE host knows how to communicate with it.

He is using a 32 CIDR or 255.255.255.255 subnet mask, so the PVE host can't communicate with anything except you manually set a route or route between different subnets.

 

[rkaraca]

I cant understand what you are talking about mate.
Can you advice me what should l do to fix the network problems if possible for the newbies ?

 

[elmarconi]

He is using a 32 CIDR or 255.255.255.255 subnet mask, so the PVE host can't communicate with anything except you manually set a route or route between different subnets.

I need to read up on the use case of using a /32...