[SOLVED] NIC passthrough results in loss of connectivity

[DialDown]

Currently running Proxmox on a Lenovo T440 Laptop (testing purposes)
This means I have only 1 NIC.

I was trying to install OPNsense, so I followed: (confirmed it is in line with official documentation best practices)
https://fuzzyitlogic.com/2018/11/05/install-opnsense-in-proxmox-ve-on-a-qotom-q355g4/

1. After setting up the configuration, everything was fine, until I started the VM (initial setup) , and then I lost the network connection to the host. (both ssh & web interface)
2. I checked my router and the host's IP 192.168.0.229 in my case, was online, but pinging it from any device from the network time'd out.
3. Ran a <qm stop [VMID] > directly on the host & made sure the VM was stopped, but the connection did not come back
4. Rebooting the host server seems to reset everything & I regain full access
5. If I start the the VM, everything drops again.

Maybe I don't fully understand how passthrough works, but am I just telling the network: ''Ignore the host, just connect my router to the VM'', thus losing all other connections?

lipci output:

00:00.0 Host bridge: Intel Corporation Haswell-ULT DRAM Controller (rev 0b)
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 0b)
00:03.0 Audio device: Intel Corporation Haswell-ULT HD Audio Controller (rev 0b)
00:14.0 USB controller: Intel Corporation 8 Series USB xHCI HC (rev 04)
00:16.0 Communication controller: Intel Corporation 8 Series HECI #0 (rev 04)
00:16.3 Serial controller: Intel Corporation 8 Series HECI KT (rev 04)
00:19.0 Ethernet controller: Intel Corporation Ethernet Connection I218-LM (rev 04)
00:1b.0 Audio device: Intel Corporation 8 Series HD Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 6 (rev e4)
00:1c.1 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 3 (rev e4)
00:1d.0 USB controller: Intel Corporation 8 Series USB EHCI #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation 8 Series LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 8 Series SATA Controller 1 [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 8 Series SMBus Controller (rev 04)
02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5227 PCI Express Card Reader (rev 01)
03:00.0 Network controller: Intel Corporation Wireless 7260 (rev 83)

qm config problem VMID output

bootdisk: scsi0
cores: 2
cpu: host
hostpci0: 00:19.0
ide2: local:iso/OPNsense-20.1-OpenSSL-dvd-amd64.iso,media=cdrom
memory: 2048
name: pvm-hulk-OPNsense
net0: virtio=1A:7B:E7:CF:32:D5,bridge=vmbr0,firewall=1
numa: 0
ostype: other
scsi0: local-lvm:vm-103-disk-0,size=10G
scsihw: virtio-scsi-pci
smbios1: uuid=2010fe32-e390-4ed2-96cd-b362c91280df
sockets: 1
vmgenid: b23605cd-82bb-4872-87a3-bd1d47ba79e8

/sys/kernel/iommu_groups/0/devices/0000:00:00.0
/sys/kernel/iommu_groups/1/devices/0000:00:02.0
/sys/kernel/iommu_groups/2/devices/0000:00:03.0
/sys/kernel/iommu_groups/3/devices/0000:00:14.0
/sys/kernel/iommu_groups/4/devices/0000:00:16.0
/sys/kernel/iommu_groups/4/devices/0000:00:16.3
/sys/kernel/iommu_groups/5/devices/0000:00:19.0
/sys/kernel/iommu_groups/6/devices/0000:00:1b.0
/sys/kernel/iommu_groups/7/devices/0000:00:1c.0
/sys/kernel/iommu_groups/8/devices/0000:00:1c.1
/sys/kernel/iommu_groups/9/devices/0000:00:1d.0
/sys/kernel/iommu_groups/10/devices/0000:00:1f.0
/sys/kernel/iommu_groups/10/devices/0000:00:1f.2
/sys/kernel/iommu_groups/10/devices/0000:00:1f.3
/sys/kernel/iommu_groups/11/devices/0000:02:00.0
/sys/kernel/iommu_groups/12/devices/0000:03:00.0

Thank you for your time & patience,
Regards,
C

 

[dcsapak]

AFAICS, you only have one PCI network card (disregarding the wifi one)
you cannot passthrough a nic while using it on the host at the same time,
so either you use virtual nics for the vm, or you install a second nic and pass through that.

 

[DialDown]

Thanks, Dominik, it definitely makes sense. I already ordered a USB-to-Ethernet adapter.
Have a great rest of the day & week.

Cheers,
Calin