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--- operating_systems:linux:debian:interface_name [2017/10/31 10:16] – kroduit
+++ operating_systems:linux:debian:interface_name [2022/02/01 13:34] (current) – ateixeira
@@ Line 59: / Line 59: @@
 [...]</code>
   - If you have some trouble, you can add log.<code>vim /etc/udev/udev.conf</code><code>udev_log="debug"</code>But don't forget to remove after your fixing.
+<note tip>Why interface name suggested are lanX instead of ethX?</note>
+I've made some tests with debian 8 and i encounter this problem:\\
+If i comment 1 line in udev rules (for example eth4), eth4 retrieve his old default name (eth2) and eth2 get the name "rename". In this case, eth2 physical become eth4 and this is unsafe. For preventing this (and preventing a wrong naming when an interface is out of order), interface name is lanX.\\
+If i comment the lan4 line in udev rules, lan4 (eth4 physical) become eth2, but lan2 stay lan2 and eth4 physical simply doesn't work because /etc/network/interfaces doesn't content ethX declarations.
+ ====== Changing raspbian 9.9 (stretch) interface name ======
+[[https://askubuntu.com/questions/947519/ubuntu-17-04-how-to-rename-a-usb-network-interface-based-on-path-not-based-on|source]]
+found Path and MAC address
+<code>
+ifconfig
+udevadm info -e | grep -A 5 -B 18 "INTERFACE=eth"
+</code>
+add files like 1x-lanx.link in /etc/systemd/network/ with rules like :
+<code>
+[Match]
+Path=<id_path>
+MACAddress=00:e0:4c:36:01:6b
+[Link]
+Name=lan0
+</code>
+<note important>To get the id_path type: udevadm info /sys/class/net/<network interface name></note>
+add file 99-default.link in /etc/systemd/network/ with rules like :
+<code>
+[Link]
+NamePolicy=kernel database onboard slot path
+MACAddressPolicy=persistent
+</code>
+to permit user-defined name of USB network interfaces, it's necessary to enable the 80-net-setup-link.rules rule with this command :
+<code>
+sudo ln -s /lib/udev/rules.d/80-net-setup-link.rules /etc/udev/rules.d/80-net-setup-link.rules
+</code>
+ ====== Changing debian 11.1 (bullseye) interface name ======
+found ID_PATH and MAC address
+<code>
+udevadm info -e | grep -A 5 -B 18 "INTERFACE=<interface name>"
+ip a
+</code>
+edit files like 1x-lanx.link in /etc/systemd/network/ with rules like :
+<code>
+[Match]
+Path=<id_path>
+MACAddress=00:e0:4c:36:01:6b
+[Link]
+Name=lan0
+</code>
+make sure file 99-default.link is present in /etc/systemd/network/ with rules like :
+<code>
+[Link]
+NamePolicy=kernel database onboard slot path
+MACAddressPolicy=persistent
+</code>
+to permit user-defined name of USB network interfaces, it's necessary to enable the 80-net-setup-link.rules rule with this command :
+<code>
+sudo ln -s /lib/udev/rules.d/80-net-setup-link.rules /etc/udev/rules.d/80-net-setup-link.rules
+</code>