DHCP server in VM

[Vitupow]

Good morning,

I have installed a debian server as a DHCP server within a vm in proxmox but from a client site I am not able to lease an IP address from this server. Can a vm be installed as a DHCP server within the Proxmox infrastructure?

Thanks

 

[shanreich]

It should be possible, do you have the firewall activated by chance? The Firewall blocks DHCP servers by default, unless explicitly allowed.

 

[Vitupow]

i´m going to check and try and I report in this post the results.

Thanks!

 

[sysmg]

Have you ever resolved this problem?

I am migrating an esxi environment to proxmox. For various reasons I have a debian DHCP server that I am trying to migrate from ESXI to Proxmox. VMs in proxmox were able to get IP addresses from the debian DHCP server when it was running in esxi host. When I migrated the DHCP VM to Proxmox, other proxmox VMs were unable to get an IP address.

Originally I had all firewalls off and it didn't work. I tried enabling firewalls and putting in allows for DHCP in Datacenter, host and DHCP VM, but that didn't help. Here are my settings:
At the datacenter level:



At the host (node) level:



At the DHCP server KVM level:

 

[sysmg]

Anyone have any ideas on how I can diagnose this?

 

[milew]

show proxmox and vm network interfaces configuration.

 

[sysmg]

Here is Proxmox Network interfaces configuration:


Here is the DHCP KVMs hardware configuration:



The initial firewall configs were in previous post. Although right now in datacenter(cluster), host and KVM the firewalls are all disabled in the Firewall options at all three levels.

 

[sysmg]

Added a second nic on the same subnet to proxmox host. Created vmbr1 and configured DHCP server to use bridge=vmbr1. Didn't help.

 

[sysmg]

I figured it out. I am a dummy.

I had changed /etc/network/interfaces to the new network interface name after migrating from ESXI to Proxmox, just as I did for all the other migrated VMs. But I also needed to change /etc/default/isc-dhcp-server to point to the new network interface name. Now everything is working. Next steps to try and turn on firewalls.