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If the second NIC is for ethercat or a Mesa Card, I would use the on board Broadcom NIC for it and the Realtek card for internet connectivity.
The DKMS driver should exist for the Pi on Debian. You may have to edit /etc/apt/sources.list to add non-free to the Deb stanzas so it can find DKMS.
Worst you can do is break it again...
sudo apt update
sudo apt install linux-headers r8168-dkms

Hmm, Debian's wiki is as out of date as Linuxcnc's.

Untested, but I think the the correct way to bring a interface up should be:
ip link set dev enp2s0 up

So I think the interfaces file should be
pre-up /sbin/ip link set dev $IFACE up
post-down /sbin/ip link set dev $IFACE down

I did find a igc kernel patch Intel was involved in so I think its OK to ignore:Subject: [PATCH] net/igc: disable EEE by default on I225/226
>
> I226-V devices can hang when EEE is enabled. Explicitly disable EEE during
> initialization of the device, as the Linux and FreeBSD kernel drivers do.Also, I think we should disable all power mangerment in grub:
pcie_aspm.policy=performance pcie_port_pm=off

So many gotchas!

No, up to now I did not configure anything. I installed the Gnome network manager and plugged the network cable to the ethernet port. I got an information from my router that it assigned a new IP to that ethernet port, so I tried to ping on that IP.
As I wrote, I will take my time and try to read and understand how to configure the new NIC in Linux. I have worked with Linux several times in the past, but I am more a noob than an expert in Linux.

Have you configured the waveshare NIC to get an address via dhcpd ?
Have you done anything to configure that interface ?

Using dmesg gives information if I unplug and plug the network cable on eth0 and eth1:

cnc@linuxcnc1:~$ sudo dmesg | grep eth
[51259.808328] r8169 0000:01:00.0 eth1: Link is Down
[51334.956935] macb 1f00100000.ethernet eth0: Link is Down
[51336.323225] r8169 0000:01:00.0 eth1: Link is Up - 100Mbps/Full - flow control rx/tx
[51431.494868] r8169 0000:01:00.0 eth1: Link is Down
[51433.262584] macb 1f00100000.ethernet eth0: Link is Up - 100Mbps/Full - flow control tx

If I connect the port to a network switch it is getting an IP from the router, but it is not possible to ping to that ip. I will try to read some more about how to get that working.

Hello , i've got the same Problem but the manual doesn't help me.
Have you solved this problem?

Hi,

So I got my spindle and VFD wired up as you mentioned but as I am new to LinuxCNC I don't know how to set up my LinuxCNC to run my spindle. I am using 7i96s_5abobd.bin firmware if that has any impact on this. Thank you for being so helpful.

I'm assuming this is the output when running the Linuxcnc image.

Ethernet device has been detected and the driver loaded.

Your NIC is there, just waiting to be configured, most likely it will be enp1s0. It's very rare interfaces identify as eth0 eth1 etc anymore without any kernel options being given. Has been this way for a few years now.

forum.linuxcnc.org/38-general-linuxcnc-q...l-images-only#325007 is a thread that indexes topics in the main RPi5/4 thread. Plenty there on configuring interfaces installing Gnome Network manager and the sort.

Unsure as to why dmesg isn't giving any output.

Hi again,So I finally got this BoB,  and I have wired up everything according to this video tutorial I found, but I don't know how to configure my B-axis to run through the BoB on LinuxCNC. I also managed to flash the 7i96s_5abobd.bin firmware to the mesa card but I'm not sure how to proceed on LinuxCNC
Thank you so much for your help.

Added pins:
enable IN BIT - Enable joywheel
multiplier IN FLOAT - Output signal multiplier. For reverse: -1.0

hallo Michael,

vielen Dank für Deine Hilfe. ich habe flatpak über das terminal installiert.

Wie binde ich jetzt freecad 1.0 ein?

karlhe