VMs set in DHCP mode not getting IP.

[syphon]

HI everyone,

I've got a problem with my dhcp setup I'm trying to figure it out.

My proxmox cluster is right now set in a default configuration using a bridge as described in the documentation. Proxmox Documentation
Every VM is connected to the same vmbr0 of the gui, so every vm can have an ip on the same subnet of proxmox itself.

Fine.
Every VM with a static ip works as expected. No problem so far.

VM set in DHCP mode, nothing. No IP from DHCP.
I can even see the request has been made, but no response.

Any other machine connected directly to the network gets a response from the DHCP.

Here the packet sent from a VM (I redacted the MAC Address for what is worth).

Any suggestion?

tcpdump -i vmbr0 port 67 or port 68 -e -n -vv
tcpdump: listening on vmbr0, link-type EN10MB (Ethernet), snapshot length 262144 bytes
17:51:47.215175 xx:xx:xx:xx:xx:xx > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800), length 339: (tos 0xc0, ttl 64, id 0, offset 0, flags [none], proto UDP (17), length 325)
    0.0.0.0.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from xx:xx:xx:xx:xx:xx, length 297, xid 0xd99e8483, secs 4669, Flags [none] (0x0000)
      Client-Ethernet-Address xx:xx:xx:xx:xx:xx
      Vendor-rfc1048 Extensions
        Magic Cookie 0x63825363
        DHCP-Message (53), length 1: Discover
        Client-ID (61), length 19: hardware-type 255, ca:53:09:5a:00:02:00:00:ab:11:55:cd:af:f3:b8:2a:41:e5
        Parameter-Request (55), length 11:
          Subnet-Mask (1), Default-Gateway (3), Domain-Name-Server (6), Hostname (12)
          Domain-Name (15), MTU (26), Static-Route (33), NTP (42)
          Unknown (119), Unknown (120), Classless-Static-Route (121)
        MSZ (57), length 2: 576
        Hostname (12), length 13: "ubuntu-server"

 

[Deepcuts]

Is the nic an Intel one ending in -LM? Like I226-LM? Or maybe some other with Intel vPro?
If so, this is a problem with Intel vPro and there is nothing you can do about it.
Use another nic.