[SOLVED] Network Interface Loses Static IP Address When Cable Is Removed

D1ver · 02-21-2012, 07:57 PM

Hello,
I'm working on an embedded Linux application and I need to give the USB ethernet interface (shows up as usb1 in ifconfig) a static IP address.

I've added the following to /etc/network/interfaces and usb1 successfully gets the correct IP on bootup

Code:

auto usb1
iface usb1 inet static
    address 192.168.1.100
    netmask 255.255.255.0
    broadcast 192.168.1.255

However, when I unplug the rj45 cable and plug it back in again the IP address is lost. Doing a simple

Code:

ifdown usb1
ifup usb1

fixes this problem, but it doens't seem to do it automatically.

I need to be able to turn the device on, and whenever I plug in the Ethernet cable, be able to talk to it on a specific IP address..

Any help is appreciated.

malekmustaq · 02-21-2012, 09:05 PM

Hi,

To make the interface available at boot up and permanent try to fix it at the /etc/rc.d/rc.inet1.conf.

There find something like --

IFNAME[4]="wlan0" (Change this to "usb1")
IPADDR[4]=""
NETMASK[4]=""
USE_DHCP[4]="no"

fill up the IPADDR with the static IP so that the kernel will not treat it as eth0.

After fixing these values in the rc.inet1.conf just restart the script being root

"--# /etc/rc.d/rc.inet1 restart"

This might work. But I have not tested it yet.

Hope that helps. Good luck.

mm

D1ver · 02-22-2012, 11:21 PM

Managed to get this working by building ifplugd in openembedded. Marking as solved.