On 07/07/2017 02:13 AM, James Hogarth wrote:
On 30 June 2017 at 18:58, <m.roth@xxxxxxxxx> wrote:
Got a problem: a user's workstation froze. He wound up rebooting, without
calling me in first, so I dunno. But, and this is a show-stopper, when it
came up, it came up with the firmware MAC, not the spoofed one. In
/etc/sysconfig/network-scripts/ifcg-eth0, I've got the spoofed MAC
address, and a UUID. In the grub.conf, I've got net.ifnames=0
biosdevname=0. But when I logged onto his machine, ip a showed eth0... but
with the firmware MAC.
And I'm wondering if it went to renew its IP address, and lost the spoofed
MAC. That might explain his freezes.
Anyway, does anyone have any idea if there's some networkmangler or
systemd configuration that would force it to pay attention?
Note that my hack to fix it was ifdown eth0/ifup eth0, and it's fine.
Not much to go on here ....
Your ifcfg-* configs would be helpful.
There was a slight change to MAC spoof behaviour in the NM 1.4.0 that
was part of EL7.3 compared to the older NM as I recall
https://www.hogarthuk.com/?q=node/18
That may or may not be affecting you.
I am using Centos7-armv7hl and have had no problem altering my MAC
address. Much easier than back in Centos6. All I have needed is in
ifcfg-eth0 like:
DEVICE="eth0"
BOOTPROTO=none
ONBOOT="yes"
TYPE="Ethernet"
NAME="eth0"
MACADDR=02:67:15:00:E0:02
MTU=1500
DNS1=192.168.224.2
GATEWAY="192.168.224.1"
IPADDR="192.168.224.2"
NETMASK="255.255.255.0"
IPV6INIT="yes"
No grub.conf but
cat /boot/extlinux/extlinux.conf
#Created by RootFS Build Factory
ui menu.c32
menu autoboot centos
menu title centos Options
#menu hidden
timeout 60
totaltimeout 600
label centos
kernel /vmlinuz-4.9.30-203.el7.armv7hl
append enforcing=1 root=UUID=ad25a528-baf4-469c-bd12-5276e8f5f9ae
fdtdir /dtb-4.9.30-203.el7.armv7hl
initrd /initramfs-4.9.30-203.el7.armv7hl.img
Oh, ip addr shows:
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
state UP qlen 1000
link/ether 02:67:15:00:e0:02 brd ff:ff:ff:ff:ff:ff
inet 192.168.224.2/24 brd 192.168.224.255 scope global eth0
valid_lft forever preferred_lft forever
inet6 2601:4:2001:7302:67:15ff:fe00:e002/64 scope global
noprefixroute dynamic
valid_lft 2147448sec preferred_lft 604765sec
inet6 fe80::67:15ff:fe00:e002/64 scope link
valid_lft forever preferred_lft forever
BTW, the reason I change my MAC is to thus hand-craft my IPv6 address.
6715 is my IANA Enterprise number and e002 is the IPv4 subnet address. :)
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