Subject: Re: [CentOS] Centos 7 and MAC address munging
Date: Thu, 18 May 2017 06:22:21 +0100
From: James Hogarth <james.hogarth at gmail.com>>
> On 17 May 2017 8:53 pm, <m.roth at 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
