Background: I use a RPi5 as my primary router/firewall. I have an old x86/64 mini PC that I configured as a backup, the idea being I can just swap it in for the the RPi if it every needs maintenance. I want to setup a new interface via a USB NIC to the x86/64 box that can be used to simply ssh into…

[image] darksky: This went terribly wrong. Even though the x86/64 was only connected via the usb NIC, it somehow started pushing IP addresses to clients on the network. It seems like the device name eth1 was assigned to the USB to Ethernet adapter during system boot. [image] …

Thanks for posting that. I will review but that seems likely. Is state of the art to fix this a hacky script? Seems like persistent Ethernet naming is a pretty core functionality.

[image] darksky: Is state of the art to fix this a hacky script? The only way I am aware of is to use a hotplug script, as udev is missing in OpenWrt.

Thanks, I came across several options... do you happen to be using one that you can recommend?

So I booted several times with just the USB NIC connected to a cable and the order of the NICs was not scrambled. The USB NIC remained as eth2 all five times. So returning to my original question: why doesn't the following modification work (adding these lines to network shared above): config inter…

My assumption was based on the statement that the usb dongle was assigning IP addresses when the interface should have been set as a DHCP client. My apologies if I misunderstood something. Good luck.

Eth2.10 makes the port send tagged packets, which a non vlan-aware device will not receive. Use just eth2 when connecting to a non vlan PC etc.

I think you're right... I switched it to a static without the 8021q. config interface 'usb' option device 'eth2' option proto 'static' option ipaddr '10.9.8.7' option netmask '255.255.255.0' option delegate '0' It only works however if I stop the lan interface and then restart it. Why? ifdo…

Adding a 3rd NIC to a router/firewall

Installing and Using OpenWrt Network and Wireless Configuration

pavelgl February 18, 2025, 7:23am 2

It seems like the device name eth1 was assigned to the USB to Ethernet adapter during system boot.