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.
mark
On 30 June 2017 at 18:58, m.roth@5-cent.us 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.
On 07/07/2017 02:13 AM, James Hogarth wrote:
On 30 June 2017 at 18:58, m.roth@5-cent.us 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. :)
-
James Hogarth -
m.roth＠5-cent.us -
Robert Moskowitz