eth0 again

[Amadeus W.M.]

On Sun, 20 Jul 2014 15:54:41 +0000, Amadeus W.M. wrote:

> I have to install Matlab on a Fedora 20 machine and I need to rename the 
> network device to eth0, or else Matlab won't install. This is a known issue:
> 
> http://www.mathworks.com/matlabcentral/answers/100235-why-can-t-i-activate-matlab-or-start-the-license-manager-in-a-newer-linux-environment#answer_109583
> 
> So, to revert to eth0, I follow these instructions:
> 
> http://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/
> 
> 
> It says I have 4 options. I did ALL of them and still 
> 
> [root at phoenix ~]# /sbin/ifconfig
> em1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
>         inet 192.168.1.40  netmask 255.255.255.0  broadcast 192.168.1.255
>         inet6 fe80::20c:f1ff:febc:29fe  prefixlen 64  scopeid 0x20<link>
>         ether 00:0c:f1:bc:29:fe  txqueuelen 1000  (Ethernet)
>         RX packets 713  bytes 306565 (299.3 KiB)
>         RX errors 0  dropped 0  overruns 0  frame 0
>         TX packets 979  bytes 131054 (127.9 KiB)
>         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
> 
> etc.
> 
> 
> Specifically, I have masked /usr/lib/udev/rules.d/80-net-name-slot.rules 
> by creating a link /etc/udev/rules.d/80-net-name-slot.rules -> /dev/null.
> 
> [root at phoenix ~]# ls -l /etc/udev/rules.d/
> total 8
> -rw-r--r--. 1 root root 151 Jul  6 20:31 70-persistent-net.rules
> lrwxrwxrwx. 1 root root   9 Jul 20 10:36 80-net-name-slot.rules -> /dev/null
> -rw-r--r--. 1 root root 352 Apr  3 04:36 98-kexec.rules
> 
> 
> I also have an /etc/udev/rules.d/70-persistent-net.rules: 
> 
> [root at phoenix ~]# cat /etc/udev/rules.d/70-persistent-net.rules 
> SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:f1:bc:29:fe", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
> 
> I also passed net.ifnames=0 to the kernel upon boot:
> 
> [root at phoenix ~]# dmesg | grep ifnames
> [    0.000000] Kernel command line: BOOT_IMAGE=/vmlinuz-3.15.6-200.fc20.i686+PAE root=UUID=aa696c85-f1d4-4bf3-9a93-b011ec8e9a6a ro vconsole.font=latarcyrheb-sun16 rhgb quiet net.ifnames=0 LANG=en_US.UTF-8
> 
> Someone must have figured this out. Can anybody please help me solve this?
> 
> 
> 
> Also, NetworkManager might have something to do with this, because if I 
> right-click the NW applet -> Edit Connections, I do have a connection named 
> eth0, but if I try to edit that, the device MAC address is 
> 
> 00:0c:f1:bc:29:fe (em1)
> 
> So NW somehow likes em1, despite all my efforts. If I stop and disable NW, 
> then the network does not even start upon boot, as it should. How do I tell 
> NW to leave my network alone and still have the network start upon boot?
> 
> Thanks!


More on this. Network Manager seems to do the right thing. 
In /var/log/messages: 

Jul 20 12:44:33 phoenix NetworkManager[1684]: ifcfg-rh: parsing /etc/sysconfig/network-scripts/ifcfg-lo ...
Jul 20 12:44:33 phoenix NetworkManager[1684]: ifcfg-rh: parsing /etc/sysconfig/network-scripts/ifcfg-eth0 ...
Jul 20 12:44:33 phoenix NetworkManager[1684]: ifcfg-rh:     read connection 'eth0'

So it reads /etc/sysconfig/network-scripts/ifcfg-eth0. Then

[root at phoenix ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0 
TYPE="Ethernet"
BOOTPROTO=none
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
IPV6INIT="yes"
IPV6_AUTOCONF="yes"
IPV6_DEFROUTE="yes"
IPV6_FAILURE_FATAL="no"
NAME="eth0"
UUID="8b3948d3-4447-4016-8d24-1e26f65a3008"
ONBOOT="yes"
HWADDR=00:0C:F1:BC:29:FE
IPADDR0=192.168.1.40
PREFIX0=24
GATEWAY0=192.168.1.1
DNS1=192.168.1.1
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes



Could avahi be doing something funny? 

Jul 20 12:38:15 phoenix avahi-daemon[478]: Network interface enumeration completed.