Subject: Re: [CentOS] Centos 7 and MAC address munging Date: Thu, 18 May 2017 06:22:21 +0100 From: James Hogarth james.hogarth@gmail.com
On 17 May 2017 8:53 pm, m.roth@5-cent.us wrote:
Odd situation: I've mentioned before that I have several users for whom I
< have to spoof the MAC address, due to a software license. Now, I've got
net.ifnames=0 biosdevname=0 on the grub2 command line, and I've got the spoofed MAC address in /etc/sysconfig/network-sctipts/ifcfg-eth0.
But he had a serious problem - X froze, and he thought to reboot, rather than call me. It came up with the actual MAC. I tried a number of things, including reboots, but the only thing that worked was systemctl stop NetworkManager, ifdown eth0, then ifup eth0, then start NetworkMangler, and all was good.
Yeah, I know, afterwards, I remembered I should have use nmcli....
But the real question is *why* did it fail on the reboot. I find no clues in dmesg, or messages, or boot.log.
Clues for the poor?
Is this box fully updated? I ask as the NM since 7.3 has different behaviour from release due to rebasing.
Mostly. Running 3.10.0-514.10.2.el7.x86_64, and yum tells me nothing marked for update (that's ignoring that we have exclude=kernel* *xorg* *nvid* kmod* in yum.conf)
What does `nmcli con sh eth0 | grep clone` tell you?
802-3-ethernet.cloned-mac-address: and the spoofed MAC address.
It's that property you need to set.
Sorry, I don't understand the above sentence. What property - 802-3-ethernet.cloned-mac-address? And this is on top of ifcfg-eth0, and all the rest?
mark