IP address change, reconfiguration needed?

[mcourtois]

Hello,

My server moved and changed of network.
So I change /etc/network/interfaces to change address (10.x.y.z), netmask (/24) and gateway (10.x.y.254) on the server and VM's (several debian8, 1 centos), all with static IP's.

The server seems work as expected: web interface, ssh... (10.x.y.5, vmbr0 bridged on eth0).
1 debian8 (http server) seems work correctly (10.x.y.18).
For 2 others (same debian8 os, 10.x.y.19 and 20) the network connection is very unstable: they were available some hours and sometimes not (and not necessarly at the same time)...
When they are not responding I can check that the gateway (10.x.y.254) does not ping from the VM!

Do I need reconfigure something else on the proxmox server?
Any idea where search error messages?

Note: I try to install a new debian just for test: dhcp is not available. Perhaps there is something wrong on the new network...

Thanks in advance for your help!

MC

 

[manu]

For PVE you also need to check that the entry in /etc/hosts matches your new IP adress.
Are you by chance on OVH ? If yes you should have a look at this tutorial:
https://pve.proxmox.com/wiki/OVH

 

[mcourtois]

Thanks for your reply.
Actually it was not a problem on my Proxmox server, neither on the network config of my VMs!
There was a very low limit of addressable IP on a network equipment behind the server.
That's why a guest worked perfectly and others were unstable.

MC