[SOLVED] dnsmasq: unknown interface eth1

Clarkman · 11-05-2017, 01:48 PM

I'm having an issue with dnsmasq and eth1.

I'm on Debian Jesse, with a USB 3.0 multifunction hub. The hub and beaglebone (and the dnsmasq command below) all worked on my Dell with Jesse. The dnsmasq command is:

Code:

sudo dnsmasq --bind-interfaces --interface=eth1 --except-interface=lo --listen-address=192.168.111.1 --dhcp-range=192.168.111.2,192.168.111.10,12h --enable-tftp --tftp-root=/srv/tftp,eth1

The error I get reads like this:

Code:

dnsmasq: unknown interface eth1

ifconfig shows:

Code:

eth1      Link encap:Ethernet  HWaddr 00:0e:c6:cc:6a:53  
          inet addr:192.168.111.1  Bcast:192.168.111.255  Mask:255.255.255.0
          inet6 addr: fe80::20e:c6ff:fecc:6a53/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:24 errors:0 dropped:0 overruns:0 frame:0
          TX packets:775 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:7669 (7.4 KiB)  TX bytes:148648 (145.1 KiB

it pings and appears happy:

Code:

$cat /sys/class/net/eth1/operstate 
up

nmcli d looks ok:

Code:

$nmcli d
DEVICE  TYPE      STATE      CONNECTION         
eth0    ethernet  connected  Wired connection 1 
eth1    ethernet  connected  BBB                
lo      loopback  unmanaged  --

but nmcli c looks confused:

Code:

$nmcli c
NAME                UUID                                  TYPE            DEVICE 
BBB                 0c960beb-878a-4c9c-b46c-5fa55f9da984  802-3-ethernet  eth1   
Wired connection 1  eb12bb70-3018-4a83-8031-f1a30f2e4dcc  802-3-ethernet  eth0   
Ifupdown (eth1)     7b635ed6-2640-7ad8-675d-744db12dd9fa  802-3-ethernet  --

The eth1 appears and disappears 'properly' when I plug/unplug the ethernet cable into the hub, but there is an additional device that stays around (Ifupdown, not anything I made).
The problem persists whether I add the eth1 stuff to /etc/network/interfaces as shown here:

Code:

auto lo
iface lo inet loopback

auto eth1
iface eth1 inet static
 address 192.168.111.1
 netmask 255.255.255.0
 gateway 0.0.0.0

I added /etc/dnsmasq.conf:

Code:

port=0
interface=eth1
dhcp-range=192.168.111.2,192.168.111.6,12h
enable-tftp
tftp-root=/srv/tftp

and edited NetworkManager.conf:

Code:

[main]
plugins=ifupdown,keyfile

[ifupdown]
managed=true

This stopped eth1 from being unmanaged, not sure if that's a good thing.
I have rebooted, restarted NetworkManager and network multiple times. I am stuck.
What am I doing wrong?
Thanks!

Clarkman · 11-05-2017, 03:26 PM

OK, I think I'm seeing double. If I take the dnsmasq cmd out of my script and paste it at the command line, it works. Holy I've been at this too long!