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#1 2019-09-15 12:59:25

graysky
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From: :wq
Registered: 2008-12-01
Posts: 10,595
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Update to systemd 243.0-1 changed MAC address

I am using systemd-networkd to manage a simple dhcp wired connection.  I found that upon updating to systemd-243.0-1 and a reboot changed my adapter's MAC address.  Have others found this to be the case?

EDIT:
Confirmed on several machines now:
1) Simple dhcp wired network machine
2) Bridge configuration also using dhcp.

Last edited by graysky (2019-09-15 13:06:35)


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#2 2019-09-15 13:51:56

Swiggles
Member
Registered: 2014-08-02
Posts: 266

Re: Update to systemd 243.0-1 changed MAC address

If your MacAddressPolicy is set to persistent I would assume it is a bug with systemd or the kernel no matter what:
https://www.freedesktop.org/software/sy … .link.html

Per default this is set in /usr/lib/systemd/network/99-default.link

Does the new MAC persist between reboots? Does it match to any vendor?

Sorry, I can't properly answer your request myself right now, but I am curious.

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#3 2019-09-15 14:16:09

graysky
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From: :wq
Registered: 2008-12-01
Posts: 10,595
Website

Re: Update to systemd 243.0-1 changed MAC address

The new MAC does persist between reboots.  When I lookup the new MAC assigned to the physical adapters, they do come back to the vendor of the motherboard.


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#4 2019-09-15 14:50:22

progandy
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Registered: 2012-05-17
Posts: 5,184

Re: Update to systemd 243.0-1 changed MAC address

Maybe this change is related? You could maybe choose a naming scheme and add it to the kernel commandline (e.g. net.naming-scheme=v241) or use udev drop-ins. Then systemd changes should not affect you until you manually change the scheme.

https://github.com/systemd/systemd/pull/12807

Last edited by progandy (2019-09-15 14:55:55)


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