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--- linux:linux-tutorials:set-persistent-mac-rtl8111 [2023/12/19 08:08] – created Zyzonix
+++ linux:linux-tutorials:set-persistent-mac-rtl8111 [2024/04/23 11:45] (current) – [Create udev rules] Zyzonix
@@ Line 1: / Line 1: @@
-===== Set persistent MAC for RTL8111/8168/8411 (r8169) via udev =====
+===== Set persistent MAC for RTL8111/8168/8411 (r8169) with udev =====
+<callout type="warning" icon="true">This tutorial does only work on systems that use ''**udev**'', like IPFire!</callout>
+The Linux kernel mod ''r8169'' seems to set random MAC addresses for Realtek's ethernet cards 8111/8168/8411 every time this devices gets booted. This behaviour also seems to be intended like described in [[https://bugzilla.kernel.org/show_bug.cgi?id=215087|this]] kernel patch.
+You can verify this by checking your (boot-) log, if it contains ''can't read MAC address, setting random one'' on the device that uses the mod ''r8169'', you may be affected.
+But it may break your system like when using IPFire that recognizes it's NICs from their MAC address.
+==== Get PCI device information ====
+Use the following command and determine your NIC and it's PCI address: (''pciutils'' is required)
+<code bash>lspci -v</code>
+The output may look like this:
+{{:linux:linux-tutorials:persistent_mac_rtl8111_lspci.png?900|}}
+Now take note of it's address, in this case ''04:00.0''.
+==== Create udev rules ====
+Then add a ''udev''-rule for this NIC. Therefore create a new rule:
+<code bash>
+nano /etc/udev/rules.d/10-network-persistent-custom-mac-address.rules
+</code>
+And add the following content:
+<code bash>
+SUBSYSTEM=="net", ACTION=="add", KERNELS=="0000:<pci-address>", PROGRAM="/sbin/ip link set %k address <your-persistent-mac>"
+</code>
+Replace ''pci-address'' with the NICs PCI address that you got from the step before (e.g. ''0000:01:00.0'') and ''your-persistent-mac'' with the MAC address that should always be assigned to this NIC. (both without ''<'' and ''>'').
+Finally save the file and reboot.
+----
+//Resources used: [[https://serverfault.com/questions/813995/change-interface-mac-hw-address-using-udev-rules|serverfault.com - Change interface MAC HW address]], [[https://packetpushers.net/udev/|packetpushers.net - udev]]//