Re: Fedora 31 Network Strangeness

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On 1/31/20 9:55 AM, Tom Hughes wrote:
> On 31/01/2020 14:28, Steve Dickson wrote:
> 
>> I've recently updated my laptop to F31. Then I was no longer
>> able to ssh into it. After a little debugging... it turns
>> out my laptop was not getting the expected ip address
>> from DHCP. The reason for that was the MAC address it was
>> sending to dhcpd had change!!! Looking at the interfaces
>>
>> bridge0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
>>          inet 172.31.1.175  netmask 255.255.0.0  broadcast 172.31.255.255
>>          inet6 fe80::98f9:f0d0:4b79:cdaa  prefixlen 64  scopeid 0x20<link>
>>          ether 3a:00:66:8a:dd:b9  txqueuelen 1000  (Ethernet)
>>          RX packets 259601  bytes 112149182 (106.9 MiB)
>>          RX errors 0  dropped 0  overruns 0  frame 0
>>          TX packets 256704  bytes 39319273 (37.4 MiB)
>>          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>
>> enp0s31f6: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
>>          ether 8c:16:45:fe:c1:f1  txqueuelen 1000  (Ethernet)
>>          RX packets 355186  bytes 134328851 (128.1 MiB)
>>          RX errors 0  dropped 0  overruns 0  frame 0
>>          TX packets 256743  bytes 40395059 (38.5 MiB)
>>          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
>>          device interrupt 16  memory 0xec200000-ec220000
>>
>> The bridge0 interface has as different MAC that the enp0s31f6 interface.
>> How can that be?? Esp when the hardware address (HWADDR=8C:16:45:FE:C1:F1)
>> is set in the ifcfg-bridge0_slave_1.
> 
> How are you managing your network? NetworkManager? systemd-networkd? The
> old network rc script?
Using systemctl status it appears NetworkManager is active and
systemd-networkd is not so I guess NetworkManager is doing the management

> 
> I know there was a change with systemd-networkd in a recent release so
> that it now creates a unique but persistent MAC for bridges and maybe
> other systems like NetworkManager have done the same?
Hmm... this seems odd to me... any idea why this was done?

tia,

steved.
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