[PVE-User] Virtual Hosts Cannot Resolve Domain Names

[PVE-User] Virtual Hosts Cannot Resolve Domain Names

[Brenda Nyangweso]

Hi,
For some reason, some of my virtual machines seem to have developed a DNS
issue. The host can resolve domain names, but some of the VMs cannot. The
network settings of those that can resolve are similar to those that can't.
Any clues as to what might be happening?

Kind Regards,

*Brenda *

Re: [PVE-User] Virtual Hosts Cannot Resolve Domain Names

[nada]

hi Brenda
a month ago we had similar problem at one Proxmox node.
Virtuals CT/QM with static IP were connected
but CT/QM with DHCP IP were not connected because of DHCP offer timeout.
The problem was with Mellanox netcards which were configured as bond via 
LACP (802.3ad).
There was "illegal loopback" error at syslog

Situation here was solved by
* temporal reconfig bond from LACP to active-backup and CT/QM were OK
* check firmware for Mellanox netcard related to HPE Proliant server
* 
https://support.hpe.com/hpesc/public/docDisplay?docId=a00100988en_us&docLocale=en_US
* new firmware installation
* network reconfig back to LACP
* testing reboot, QM/CT, connectivity OK

You may check your syslog at proxmox node, at DNS/DHCP server and at 
relevant switch
to find out where is your problem
all the best
Nada








On 2022-04-26 08:50, Brenda Nyangweso wrote:
> Hi,
> For some reason, some of my virtual machines seem to have developed a 
> DNS
> issue. The host can resolve domain names, but some of the VMs cannot. 
> The
> network settings of those that can resolve are similar to those that 
> can't.
> Any clues as to what might be happening?
> 
> Kind Regards,
> 
> *Brenda *
> _______________________________________________
> pve-user mailing list
> pve-user@lists.proxmox.com
> https://lists.proxmox.com/cgi-bin/mailman/listinfo/pve-user

Re: [PVE-User] Virtual Hosts Cannot Resolve Domain Names

[colonellor]

On Apr 26, 2022 8:50 AM, Brenda Nyangweso <nyangwesob@aua.ac.ke> wrote:
>
> Hi, 
> For some reason, some of my virtual machines seem to have developed a DNS 
> issue. The host can resolve domain names, but some of the VMs cannot. The 
> network settings of those that can resolve are similar to those that can't. 
> Any clues as to what might be happening? 
>
Some suggests:
Local DNS cache ?
File host ?
> Kind Regards, 
>
> *Brenda * 
> _______________________________________________ 
> pve-user mailing list 
> pve-user@lists.proxmox.com 
> https://lists.proxmox.com/cgi-bin/mailman/listinfo/pve-user 
>