Integration with Proxmox kills DHCP for VMs

[HachimanSec]

Hi everyone,
I currently setup the latest version of Netbox and integrated it with Proxmox.

SDN, VNet, etc is all configured. Just like the API key.
I can see that the IP address of the VLAN base subnet is added to Netbox.

However whenever I change the NIC of a VM to the new, Netbox integrated, network I can no longer get DHCP from the main firewall / gateway.

When I reset the IPAM setting for this VNet in Proxmox to pve it starts to work again.

Using tcpdump on the PVE node shows me the dhcp requests but nothing else.
Literally the only thing is switching IPAM form pve to netbox.

Does anyone have any idea what this might be?

tcpdump -i vmbr0.3100
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
listening on vmbr0.3100, link-type EN10MB (Ethernet), snapshot length 262144 bytes
11:56:00.133007 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from bc:24:11:73:27:fd (oui Unknown), length 293
11:56:03.310907 IP6 fe80::be24:11ff:fe73:27fd > ip6-allrouters: ICMP6, router solicitation, length 16
11:56:24.126676 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from bc:24:11:db:56:6c (oui Unknown), length 305
11:57:04.182183 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from bc:24:11:73:27:fd (oui Unknown), length 293
11:57:27.372769 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from bc:24:11:db:56:6c (oui Unknown), length 305
^C
5 packets captured
5 packets received by filter
0 packets dropped by kernel
root@pve:/# tcpdump -i Dev310
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
listening on Dev310, link-type EN10MB (Ethernet), snapshot length 262144 bytes
11:58:11.596624 IP6 fe80::be24:11ff:fe73:27fd > ip6-allrouters: ICMP6, router solicitation, length 16
11:58:32.326446 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from bc:24:11:db:56:6c (oui Unknown), length 305
11:59:11.907334 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from bc:24:11:73:27:fd (oui Unknown), length 293
11:59:37.087099 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from bc:24:11:db:56:6c (oui Unknown), length 305
12:00:16.825677 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from bc:24:11:73:27:fd (oui Unknown), length 293
12:00:40.435930 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from bc:24:11:db:56:6c (oui Unknown), length 305
12:01:20.099149 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from bc:24:11:73:27:fd (oui Unknown), length 293

[ziggekatten]

This is an Proxmox issue and not an Netbox issue. You should post your question to Proxmox.