Linux – How to get rid of dumthe interface

linuxnetworking

Hey guys I have a strange problem. There isn't an eth0 interface on my Linux embedded (ttylinux v7) client instead I have a dummy0 interface.

With this interface I can't ping anything, and I think it does not work at all.

If I run udhcpc to retrieve an IP during the boot process I can't get one (Sending discover.. No lease, failing). If I do the same after the login it works but the dummy0 continues there. That is strange because its a PXE boot so my dhcp server is running since the boot begins.

I've already put the NOZEROCONF option on /etc/network.conf.

Best Answer

The command ip link delete dummy0 is what you would use to delete it at the command line. I have no idea why a dummy interface is getting created on your system though.

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Debian – How to skip DHCP if no cable connected to ethernet in Debian

If you specify

allow-hotplug eth0

instead of

auto eth0

in /etc/network/interfaces, then the connection will only be initiated by udev when something triggers it, instead of at every boot.

That might be sufficient to handle your case, but not necessarily; the interfaces manpage mentions that

(Interfaces marked "allow-hotplug" are brought up when udev detects them. This can either be during boot if the interface is already present, or at a later time, for example when plugging in a USB network card. Please note that this does not have anything to do with detecting a network cable being plugged in.)

You might need to use /etc/network/if-up.d/00check-network-cable from the ifupdown-extra package to skip the interface if no cable is connected.

Best Answer

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