On 9/15/2024 9:36 PM, The Natural Philosopher wrote:

Unfortunately you are probably the only one here that is using RedHat on
a Pi.

You may well be right about that.

AFAIK, ethernet defaults to 'one permanent MAC address' - its only wifi
that tends to switch around for security in public wifi spaces.

Have you actually checked to see if you are getting ethernet randomisation? ifconfig -a will display it

Thank you for an actually useful suggestion. I had forgotten to check
that and just assumed that was the cause of a change in IP address.

--- SoupGate-Win32 v1.05
* Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)

On 16/09/2024 23:30, Lars Poulsen wrote:

On 9/15/2024 9:36 PM, The Natural Philosopher wrote:

Unfortunately you are probably the only one here that is using RedHat
on a Pi.

You may well be right about that.

AFAIK, ethernet defaults to 'one permanent MAC address' - its only
wifi that tends to switch around for security in public wifi spaces.

Have you actually checked to see if you are getting ethernet
randomisation?
ifconfig -a will display it

Thank you for an actually useful suggestion. I had forgotten to check
that and just assumed that was the cause of a change in IP address.

Hang on a minute.... IP address or MAC address?

IP address may change any time you connect to the DHCP server (if you
are using DHCP).

ifconfig -a
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
*inet 192.168.0.101* netmask 255.255.255.0 broadcast 192.168.0.255
inet6 fe80::9a2:3187:4600:cfc1 prefixlen 64 scopeid 0x20<link>
*ether d8:3a:dd:85:22:b1* txqueuelen 1000 (Ethernet)
RX packets 335547 bytes 39007037 (37.2 MiB)
RX errors 0 dropped 158 overruns 0 frame 0
TX packets 348598 bytes 256465720 (244.5 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

This is a statically configured *IP address* on a Pi 4B
I assume the Ethernet *MAC* address is always the same.

Looking up the MAC address online:
Result:
MAC Address Prefix Manufacturer
D83ADD Raspberry Pi Trading Ltd

--
The lifetime of any political organisation is about three years before
its been subverted by the people it tried to warn you about.

Anon.

--- SoupGate-Win32 v1.05
* Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)

On 9/17/2024 2:44 AM, The Natural Philosopher wrote:

On 16/09/2024 23:30, Lars Poulsen wrote:

On 9/15/2024 9:36 PM, The Natural Philosopher wrote:

Unfortunately you are probably the only one here that is using RedHat
on a Pi.

You may well be right about that.

AFAIK, ethernet defaults to 'one permanent MAC address' - its only
wifi that tends to switch around for security in public wifi spaces.

Have you actually checked to see if you are getting ethernet
randomisation?
ifconfig -a will display it

Thank you for an actually useful suggestion. I had forgotten to check
that and just assumed that was the cause of a change in IP address.

Hang on a minute.... IP address or MAC address?

IP address may change any time you connect to the DHCP server (if you
are using DHCP).

ifconfig -a
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
       *inet 192.168.0.101*  netmask 255.255.255.0  broadcast 192.168.0.255
        inet6 fe80::9a2:3187:4600:cfc1  prefixlen 64  scopeid 0x20<link>
       *ether d8:3a:dd:85:22:b1*  txqueuelen 1000  (Ethernet)
        RX packets 335547  bytes 39007037 (37.2 MiB)
        RX errors 0  dropped 158  overruns 0  frame 0
        TX packets 348598  bytes 256465720 (244.5 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

This is a statically configured *IP address* on a Pi 4B
I assume the Ethernet *MAC* address is always the same.

Looking up the MAC address online:
Result:
MAC Address Prefix    Manufacturer
D83ADD                Raspberry Pi Trading Ltd

My DHCP server on that network has a list of known hosts (known by their
MAX address) and what their IP address should be. Hence my annoyance
when employees with iPhones have randomized MAC addresses.

The "hobby" RPI4 in my "work" network was acquired in the hope that it
may grow into being able to become an edge router for my home network.

The edge router on my work network is a very nice headless AMD64 with 4
Gigabit ethernet ports running Fedora with iptables, OpenVPN and lots of logging to keep the subnets behind it safe.

Considering the time I have spent on my RPI experiments, the savings on
the hardware have been a false economy.

--- SoupGate-Win32 v1.05
* Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)

On 18.9.2024 5.24, Lars Poulsen wrote:

--- discussion snopped ---

My DHCP server on that network has a list of known hosts (known by their
MAX address) and what their IP address should be. Hence my annoyance
when employees with iPhones have randomized MAC addresses.

The randomised MAC addresses of iPhones are from the 'locally
administered' MAC address ranges. The non-local non-multicast
addresses have a first octet of x0, x4, x8 or xc, where x is
any hex digit.

The locally administered addresses have a first octet of x2, x6,
xa or xe (like 76:f9:76:17:f6:4d, from my iPhone).

The iPhone MAC address fudging can be turned on/off for each network separately, from the 'i' menu of the WiFi connection. Just tell your
folks to turn off the fudging for your network or stay outside.

--

-TV

--- SoupGate-Win32 v1.05
* Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)

On Tue, 17 Sep 2024 19:24:31 -0700, Lars Poulsen wrote:

My DHCP server on that network has a list of known hosts (known by their
MAX address) and what their IP address should be. Hence my annoyance
when employees with iPhones have randomized MAC addresses.

But surely those employees have individual accounts in your company authentication database, do they not: so could you not assign them IP
addresses associated with those particular accounts?

--- SoupGate-Win32 v1.05
* Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)