networking for vm stops working to local net when I set a mac address

jerrys

New Member
May 29, 2014
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0
1
Hi,

I'm trying to sort this out. I have a proxmox 3.2-4 system with vms and containers. When I try to set the mac address for an interface in a vm, I can ping from the VM and from the host machine, but nowhere else on the local net. If I don't set the mac address, everything works fine.

Single bridge vmbr0 does all the networking on the machine and all the vms and containers are bridged through it.

I'm sorry of this has been answered before, I couldn't find a way to search without getting tons of other stuff.

thanks in advance for any help.

jerry
 
Hello jerrys

When I try to set the mac address for an interface in a vm,

How did you set it? Use only the proxmox GUI (resp. the vm config files which contain the same data)

After a mac has been changed (note: it is always "set", if not defined when creating a vm proxmox makes the set generating a random value) shout down the vm and start it again (a reboot is not enough).

Depending on the OS in the vm the IP settings in the vm have to be updated (since in most cases they refer to mac-addresses).

Taking care of the above I never had any problems changing mac addresses.

Kind regards

Mr.Holmes
 
Hi,

I'm trying to sort this out. I have a proxmox 3.2-4 system with vms and containers. When I try to set the mac address for an interface in a vm, I can ping from the VM and from the host machine, but nowhere else on the local net. If I don't set the mac address, everything works fine.

Single bridge vmbr0 does all the networking on the machine and all the vms and containers are bridged through it.

I'm sorry of this has been answered before, I couldn't find a way to search without getting tons of other stuff.

thanks in advance for any help.

jerry

Hi seem to be an arp problem.

what is the guest os ? virtio or e1000 virtual nic ? which kernel/driver version ?
 

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