Unix & Linux Asked by cstrutton on December 15, 2021
I have an NPI iMX6ULL ARM based single-board computer running Debian Buster. It has 2 network ports listed by ifconfig as eth0 and eth1
It seems to be ignoring my network configuration in /etc/network/interfaces
auto lo eth0 eth1
iface lo inet loopback
iface eth0 inet dhcp
iface eth1 inet static
address 192.168.1.254
netmask 255.255.255.0
iface usb0 inet static
address 192.168.7.2
netmask 255.255.255.252
network 192.168.7.0
gateway 192.168.7.1
After booting the above configuration with eth0 connected to a dhcp server, ifconfig reports:
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.4.10.131 netmask 255.255.192.0 broadcast 10.4.63.255
inet6 fe80::d489:7cff:feec:e09e prefixlen 64 scopeid 0x20<link>
ether d6:89:7c:ec:e0:9e txqueuelen 1000 (Ethernet)
RX packets 478 bytes 42931 (41.9 KiB)
RX errors 0 dropped 29 overruns 0 frame 0
TX packets 30 bytes 2883 (2.8 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eth1: flags=-28669<UP,BROADCAST,MULTICAST,DYNAMIC> mtu 1500
ether d6:89:7c:ec:e0:9d txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
Similarly, after booting the above configuration with eth1 connected to a dhcp server, ifconfig reports:
eth0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether d6:89:7c:ec:e0:9e txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eth1: flags=-28605<UP,BROADCAST,RUNNING,MULTICAST,DYNAMIC> mtu 1500
inet 10.4.11.126 netmask 255.255.192.0 broadcast 10.4.63.255
inet6 fe80::d489:7cff:feec:e09d prefixlen 64 scopeid 0x20<link>
ether d6:89:7c:ec:e0:9d txqueuelen 1000 (Ethernet)
RX packets 1234 bytes 118390 (115.6 KiB)
RX errors 0 dropped 58 overruns 0 frame 0
TX packets 38 bytes 3547 (3.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
If I do an sudo ifdown eth1 it reports:
ifdown: interface eth1 not configured
and sudo ifup eth1 it comes up:
debian@npi:~$ sudo ifup eth1
debian@npi:~$ ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.4.10.131 netmask 255.255.192.0 broadcast 10.4.63.255
inet6 fe80::d489:7cff:feec:e09e prefixlen 64 scopeid 0x20<link>
ether d6:89:7c:ec:e0:9e txqueuelen 1000 (Ethernet)
RX packets 16846 bytes 1401257 (1.3 MiB)
RX errors 0 dropped 856 overruns 0 frame 0
TX packets 65 bytes 4551 (4.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eth1: flags=-28669<UP,BROADCAST,MULTICAST,DYNAMIC> mtu 1500
inet 192.168.1.254 netmask 255.255.255.0 broadcast 192.168.1.255
ether d6:89:7c:ec:e0:9d txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
What is controlling my network configuration on boot up. How do I find out?
I did find a couple of Google hits that talked about issues with my MAC address but this happens to both interfaces. I tried changing my MAC address as well, but nothing changed.
Thank you to Seamus for pointing me in the right direction. The key was that the image I was working with was based on the BeagleBone images.
The issue was connman taking control of the network ports before networkd. On one unit, I was able to remove connman with apt. After that, my configuration in /etc/systemd/network/interfaces was properly applied.
My research indicated that connman is the way of the future so I figured out how to configure that too. This page gave lots of great info. connmanctl can be used to set a static IP directly.
root@npi:~# connmanctl
connmanctl> config ethernet_00142d259a48_cable --ipv4 manual 192.168.10.2 255.255.255.0 192.168.10.1
connmanctl> config ethernet_00142d259a48_cable --nameservers 8.8.8.8
connmanctl> exit
The hex string in the middle of the device name is the MAC address of the device. manual specifies static IP and the numbers are the ipaddress, network mask and gateway (gateway is optional).
This page also explains it well. Most documentation unfortunately is aimed at configuring wifi. Most sites only mention static addressing in passing.
Hope this helps the next guy.
Answered by cstrutton on December 15, 2021
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