Linux – ubuntu linux: network config lost after reboot

linuxnetworkingUbuntu

I have a linux ubuntu 12.04 machine that was migrated from virtualbox to esxi. I can configure the networking using ifconfig, route add and /etc/resolv.conf and that all works fine. Also I edited the /etc/network/interfaces file with the correct networkconfig.

But still when I reboot the machine the IP address stays what it was. But the netmask turns to 255.255.255.255 and the defalt gateway and the nameservers are lost. When I check th

My /etc/network/interfaces file looks like this:

iface eth0 inet static
    address 10.11.1.5
    netmask 255.255.254.0
    gateway 10.11.1.254
    dns-search company.be
    dns-nameservers 12.45.1.1 12.45.2.1

Any idea what the reason can be?

Best Answer

Is network manager active? Look at /etc/NetworkManager/NetworkManager.conf and check the managed property, it should be set to false:

managed=false

Check also if resolvconf is installed and working and try removing it.

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