Intel QUAD NIC kills network when plugging in second cable.

[HugoHiasl]

Hello,

I tried my first NAS build and installed freenas on it.

Board: Asrock B450 gaming itx/ac
RAM: 32 Gb
SSD: nvme M.2 500 Gb
Data disk: 4 x WD Red 8 Tb
additional: PCIe QUAD NIC (EXPI9404PT) card which is recognized and seems to work ok as long as only one port has a connection to the router.

After having issues with installation (and reinstallation) of Plex which seemed to be caused by the onboard Realtik NIC I ordered an INTEL QUAD NIC board.

Now Plex is installed and I wanted to set up a VM (Win 10 ) with its own IP in my home network.

At the moment when I plug in a second network cable into that QUAD NIC card the whole network goes down and the freenas cannot be reached anymore.

Unplugging it brings the network back.

I am sure I missed some important steps. Can someone help me out here please?

Thanks a lot.

 

[sretalla]

OK; with just the one cable in it, what do you see from ifconfig -a ?

 

[jgreco]

Plugging multiple interfaces in is generally an invalid configuration.

Multiple network interfaces on a single subnet

We've had a number of people over the years bring up the topic of multiple network interfaces on a single subnet. Often done by Windows administrators or storage admins, where it works to varying degrees, this is sadly not proper IP networking practice. Multiple interfaces on a single network...

www.ixsystems.com

You either need to set it up as a link aggregation on each end, or you need to be doing something special with the second interface. If you can pass the second interface through to the Plex jail, that's probably workable. Try setting it up BEFORE plugging in the cable. Make sure that FreeNAS is not trying to run DHCP or actually anything that involves the host system IP stack. i.e. the only thing configured should probably be "up" and a bridge.