[SOLVED] Proxmox main IP switching between vmbr's

[dsimoes]

Hello,

I'm running proxmox 7.1-8 and I have two NIC's connected. I've configured two bridges:

vmbr0 <> enp3s0 192.168.1.5/24, Gateway: 192.168.1.1
vmbr1 <> enp2s0 192.168.1.6/24

I only use 192.168.1.5, but I also assigned .6 in case I needed to access from there.

I have most of my VM's / LXC assigned to vmbr0 and I have a couple assigned to vmbr1. This is to offload some traffic to the 2nd NIC.

I was checking my firewall logs (OPNsense) and noticed this:

2022-02-28T10:33:24	kernel	arp: 192.168.1.5 moved from 00:01:2e:91:f7:dd to 00:01:2e:91:f7:de on igb0
2022-02-28T09:59:16	kernel	arp: 192.168.1.5 moved from 00:01:2e:91:f7:dd to 00:01:2e:91:f7:de on igb0
2022-02-28T09:25:08	kernel	arp: 192.168.1.5 moved from 00:01:2e:91:f7:dd to 00:01:2e:91:f7:de on igb0
2022-02-28T08:51:04	kernel	arp: 192.168.1.5 moved from 00:01:2e:91:f7:dd to 00:01:2e:91:f7:de on igb0
2022-02-28T08:50:59	kernel	arp: 192.168.1.5 moved from 00:01:2e:91:f7:de to 00:01:2e:91:f7:dd on igb0
2022-02-28T08:16:56	kernel	arp: 192.168.1.5 moved from 00:01:2e:91:f7:dd to 00:01:2e:91:f7:de on igb0
2022-02-28T08:16:51	kernel	arp: 192.168.1.5 moved from 00:01:2e:91:f7:de to 00:01:2e:91:f7:dd on igb0
2022-02-28T07:42:43	kernel	arp: 192.168.1.5 moved from 00:01:2e:91:f7:dd to 00:01:2e:91:f7:de on igb0
2022-02-28T07:08:40	kernel	arp: 192.168.1.5 moved from 00:01:2e:91:f7:dd to 00:01:2e:91:f7:de on igb0
2022-02-28T07:08:35	kernel	arp: 192.168.1.5 moved from 00:01:2e:91:f7:de to 00:01:2e:91:f7:dd on igb0
2022-02-28T06:34:31	kernel	arp: 192.168.1.5 moved from 00:01:2e:91:f7:dd to 00:01:2e:91:f7:de on igb0
2022-02-28T06:34:26	kernel	arp: 192.168.1.5 moved from 00:01:2e:91:f7:de to 00:01:2e:91:f7:dd on igb0
2022-02-28T06:00:23	kernel	arp: 192.168.1.5 moved from 00:01:2e:91:f7:dd to 00:01:2e:91:f7:de on igb0
2022-02-28T06:00:18	kernel	arp: 192.168.1.5 moved from 00:01:2e:91:f7:de to 00:01:2e:91:f7:dd on igb0
2022-02-28T05:26:10	kernel	arp: 192.168.1.5 moved from 00:01:2e:91:f7:dd to 00:01:2e:91:f7:de on igb0
2022-02-28T04:52:07	kernel	arp: 192.168.1.5 moved from 00:01:2e:91:f7:dd to 00:01:2e:91:f7:de on igb0
2022-02-28T04:52:02	kernel	arp: 192.168.1.5 moved from 00:01:2e:91:f7:de to 00:01:2e:91:f7:dd on igb0
2022-02-28T04:17:53	kernel	arp: 192.168.1.5 moved from 00:01:2e:91:f7:dd to 00:01:2e:91:f7:de on igb0
2022-02-28T03:43:45	kernel	arp: 192.168.1.5 moved from 00:01:2e:91:f7:dd to 00:01:2e:91:f7:de on igb0
2022-02-28T03:09:37	kernel	arp: 192.168.1.5 moved from 00:01:2e:91:f7:dd to 00:01:2e:91:f7:de on igb0

Means opnsense is detecting proxmox main ip address is moving from the first NIC to the 2nd and vice-versa. Any idea what's going on?

Thanks for the help.

 

[Dunuin]

You should not give a single host two IPs in the same subnet. That will just cause problems because no network member will know where to send the packets. Either give your vmbr0 or your vmbr1 a IP in the 192.168.1.0/24 subnet but not both. If you want to offload some traffic create a bond with those 2 NICs, connect that bond to your vmbr0 and remove the vmbr1. For example a balance-rr bond attached to your vmbr0, then all guests attached to that vmbr0 will use both NICs.

 

[dsimoes]

You should not give a single host two IPs in the same subnet. That will just cause problems because no network member will know where to send the packets. Either give your vmbr0 or your vmbr1 a IP in the 192.168.1.0/24 subnet but not both. If you want to offload some traffic create a bond with those 2 NICs, connect that bond to your vmbr0 and remove the vmbr1. For example a balance-rr bond attached to your vmbr0, then all guests attached to that vmbr0 will use both NICs.

Ok, I've removed the 2nd IP Address on Proxmox host.
Thanks for your reply.