SwagDevOps · June 15, 2020 09:11 · Jun 15, 2020 · Jun 15, 2020 · Jan 4, 2020 · Jul 10, 2019
diff --git a/predictable_network_interfaces_with_systemd.md b/predictable_network_interfaces_with_systemd.md
@@ -16,7 +16,7 @@ source: [PredictableNetworkInterfaceNames](https://www.freedesktop.org/wiki/Soft
 ## ``/lib/systemd/network/99-default.link``
 
 ```sh
-# sudo vim /lib/systemd/network/99-default.link
+# less /lib/systemd/network/99-default.link
 ```
 ### Original
 
@@ -34,6 +34,8 @@ source: [PredictableNetworkInterfaceNames](https://www.freedesktop.org/wiki/Soft
 NamePolicy=kernel database onboard slot path
 MACAddressPolicy=persistent
 ```
+You SHOULD NOT modify this file, it COULD be regularly reverted by packages updates.
+
 ### Edited
 
 ```ini

diff --git a/predictable_network_interfaces_with_systemd.md b/predictable_network_interfaces_with_systemd.md
@@ -38,6 +38,10 @@ MACAddressPolicy=persistent
 
 ```ini
 # /etc/systemd/network/99-default.link
+
+[Match]
+OriginalName=*
+
 [Link]
 NamePolicy=mac path
 MACAddressPolicy=none
@@ -85,4 +89,8 @@ Sample output:
 ID_NET_NAME_MAC=enx9c5c8e538309
 ID_NET_NAME_ONBOARD=eno1
 ID_NET_NAME_PATH=enp0s25
-```
+```
+
+## See also
+
+* [General Network Configuration = Linux From Scratch](http://www.linuxfromscratch.org/lfs/view/9.1-systemd/chapter07/network.html)
diff --git a/predictable_network_interfaces_with_systemd.md b/predictable_network_interfaces_with_systemd.md
@@ -37,6 +37,7 @@ MACAddressPolicy=persistent
 ### Edited
 
 ```ini
+# /etc/systemd/network/99-default.link
 [Link]
 NamePolicy=mac path
 MACAddressPolicy=none

diff --git a/predictable_network_interfaces_with_systemd.md b/predictable_network_interfaces_with_systemd.md
@@ -74,7 +74,7 @@ GRUB_CMDLINE_LINUX="net.ifnames=1"
 ```sh
 (cd /sys/class/net && find * -maxdepth 1) | grep -Ev '^lo$' | \
   head -1 | \
-  perl -pe 's/:$//'| \
+  perl -pe "s/\n//" | \
   xargs -r0I {} sudo udevadm test /sys/class/net/{} 2> /dev/null | grep NAME
 ```
 

diff --git a/predictable_network_interfaces_with_systemd.md b/predictable_network_interfaces_with_systemd.md
@@ -1,7 +1,7 @@
 # Names incorporating the interfaces's MAC address
 
 > With ``systemd 197`` we have added native support for a number of different naming policies into ``systemd``/``udevd`` 
-> proper and made a scheme similar to biosdevname's (but generally more powerful, 
+> proper and made a scheme similar to ``biosdevname``'s (but generally more powerful, 
 > and closer to kernel-internal device identification schemes) the default. 
 > The following different naming schemes for network interfaces are now supported by ``udev`` natively:
 >

diff --git a/predictable_network_interfaces_with_systemd.md b/predictable_network_interfaces_with_systemd.md
@@ -10,10 +10,8 @@
 > 3. Names incorporating physical/geographical location of the connector of the hardware (example: ``enp2s0``)
 > 4. Names incorporating the interfaces's MAC address (example: ``enx78e7d1ea46da``)
 > 5. Classic, unpredictable kernel-native ethX naming (example: ``eth0``)
->
-> source: [PredictableNetworkInterfaceNames](https://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/)
 
-Names incorporating the interfaces's MAC address (example: ``enx78e7d1ea46da``)
+source: [PredictableNetworkInterfaceNames](https://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/)
 
 ## ``/lib/systemd/network/99-default.link``
 
@@ -53,6 +51,8 @@ MACAddressPolicy=none
 > * ``path`` The name is set based on the device's physical location, as exported by the ``udev`` property ``ID_NET_NAME_PATH``.
 > * ``mac`` The name is set based on the device's persistent MAC address, as exported by the ``udev`` property ``ID_NET_NAME_MAC``.
 
+source: [systemd.link — Network device configuration](https://www.freedesktop.org/software/systemd/man/systemd.link.html)
+
 ## ``/etc/default/grub``
 
 ```sh

diff --git a/predictable_network_interfaces_with_systemd.md b/predictable_network_interfaces_with_systemd.md
@@ -1,3 +1,20 @@
+# Names incorporating the interfaces's MAC address
+
+> With ``systemd 197`` we have added native support for a number of different naming policies into ``systemd``/``udevd`` 
+> proper and made a scheme similar to biosdevname's (but generally more powerful, 
+> and closer to kernel-internal device identification schemes) the default. 
+> The following different naming schemes for network interfaces are now supported by ``udev`` natively:
+>
+> 1. Names incorporating Firmware/BIOS provided index numbers for on-board devices (example: ``eno1``)
+> 2. Names incorporating Firmware/BIOS provided PCI Express hotplug slot index numbers (example: ``ens1``)
+> 3. Names incorporating physical/geographical location of the connector of the hardware (example: ``enp2s0``)
+> 4. Names incorporating the interfaces's MAC address (example: ``enx78e7d1ea46da``)
+> 5. Classic, unpredictable kernel-native ethX naming (example: ``eth0``)
+>
+> source: [PredictableNetworkInterfaceNames](https://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/)
+
+Names incorporating the interfaces's MAC address (example: ``enx78e7d1ea46da``)
+
 ## ``/lib/systemd/network/99-default.link``
 
 ```sh

diff --git a/predictable_network_interfaces_with_systemd.md b/predictable_network_interfaces_with_systemd.md
@@ -31,8 +31,8 @@ MACAddressPolicy=none
 > An ordered, space-separated list of policies by which the interface name should be set. 
 > ``NamePolicy=`` may be disabled by specifying ``net.ifnames=0`` on the kernel command line. 
 > Each of the policies may fail, and the first successful one is used. 
-> The name is not set directly, but is exported to udev as the property ``ID_NET_NAME``, 
-> which is, by default, used by a udev(7), rule to set ``NAME``. The policies used above are:
+> The name is not set directly, but is exported to ``udev`` as the property ``ID_NET_NAME``, 
+> which is, by default, used by a ``udev(7)``, rule to set ``NAME``. The policies used above are:
 > * ``path`` The name is set based on the device's physical location, as exported by the ``udev`` property ``ID_NET_NAME_PATH``.
 > * ``mac`` The name is set based on the device's persistent MAC address, as exported by the ``udev`` property ``ID_NET_NAME_MAC``.
 

diff --git a/predictable_network_interfaces_with_systemd.md b/predictable_network_interfaces_with_systemd.md
@@ -33,8 +33,8 @@ MACAddressPolicy=none
 > Each of the policies may fail, and the first successful one is used. 
 > The name is not set directly, but is exported to udev as the property ``ID_NET_NAME``, 
 > which is, by default, used by a udev(7), rule to set ``NAME``. The policies used above are:
-> * ``path`` The name is set based on the device's physical location, as exported by the udev property ``ID_NET_NAME_PATH``.
-> * ``mac`` The name is set based on the device's persistent MAC address, as exported by the udev property ``ID_NET_NAME_MAC``.
+> * ``path`` The name is set based on the device's physical location, as exported by the ``udev`` property ``ID_NET_NAME_PATH``.
+> * ``mac`` The name is set based on the device's persistent MAC address, as exported by the ``udev`` property ``ID_NET_NAME_MAC``.
 
 ## ``/etc/default/grub``
 

diff --git a/predictable_network_interfaces_with_systemd.md b/predictable_network_interfaces_with_systemd.md
@@ -55,9 +55,10 @@ GRUB_CMDLINE_LINUX="net.ifnames=1"
 ```
 
 ```sh
-ls /sys/class/net/* | grep -Ev '^lo$' | head -1 | \
-  perl -pe 's/:$//'| perl -pe "s/\n//" | \
-  xargs -r0I {} sudo udevadm test {} 2> /dev/null | grep NAME
+(cd /sys/class/net && find * -maxdepth 1) | grep -Ev '^lo$' | \
+  head -1 | \
+  perl -pe 's/:$//'| \
+  xargs -r0I {} sudo udevadm test /sys/class/net/{} 2> /dev/null | grep NAME
 ```
 
 Sample output:

diff --git a/predictable_network_interfaces_with_systemd.md b/predictable_network_interfaces_with_systemd.md
@@ -45,4 +45,25 @@ GRUB_CMDLINE_LINUX="net.ifnames=1"
 ```sh
 # sudo update-grub
 # sudo update-initramfs -u
+# sudo reboot
+```
+
+## Check/ensure
+
+```sh
+# ls /sys/class/net/
+```
+
+```sh
+ls /sys/class/net/* | grep -Ev '^lo$' | head -1 | \
+  perl -pe 's/:$//'| perl -pe "s/\n//" | \
+  xargs -r0I {} sudo udevadm test {} 2> /dev/null | grep NAME
+```
+
+Sample output:
+
+```
+ID_NET_NAME_MAC=enx9c5c8e538309
+ID_NET_NAME_ONBOARD=eno1
+ID_NET_NAME_PATH=enp0s25
 ```
diff --git a/predictable_network_interfaces_with_systemd.md b/predictable_network_interfaces_with_systemd.md
@@ -1,7 +1,7 @@
 ## ``/lib/systemd/network/99-default.link``
 
 ```sh
-sudo vim /lib/systemd/network/99-default.link
+# sudo vim /lib/systemd/network/99-default.link
 ```
 ### Original
 
@@ -32,4 +32,17 @@ MACAddressPolicy=none
 > ``NamePolicy=`` may be disabled by specifying ``net.ifnames=0`` on the kernel command line. 
 > Each of the policies may fail, and the first successful one is used. 
 > The name is not set directly, but is exported to udev as the property ``ID_NET_NAME``, 
-> which is, by default, used by a udev(7), rule to set ``NAME``. The available policies are:
+> which is, by default, used by a udev(7), rule to set ``NAME``. The policies used above are:
+> * ``path`` The name is set based on the device's physical location, as exported by the udev property ``ID_NET_NAME_PATH``.
+> * ``mac`` The name is set based on the device's persistent MAC address, as exported by the udev property ``ID_NET_NAME_MAC``.
+
+## ``/etc/default/grub``
+
+```sh
+GRUB_CMDLINE_LINUX="net.ifnames=1"
+```
+
+```sh
+# sudo update-grub
+# sudo update-initramfs -u
+```
diff --git a/predictable_network_interfaces_with_systemd.md b/predictable_network_interfaces_with_systemd.md
@@ -25,4 +25,11 @@ MACAddressPolicy=persistent
 [Link]
 NamePolicy=mac path
 MACAddressPolicy=none
-```
+```
+
+> ``NamePolicy=``
+> An ordered, space-separated list of policies by which the interface name should be set. 
+> ``NamePolicy=`` may be disabled by specifying ``net.ifnames=0`` on the kernel command line. 
+> Each of the policies may fail, and the first successful one is used. 
+> The name is not set directly, but is exported to udev as the property ``ID_NET_NAME``, 
+> which is, by default, used by a udev(7), rule to set ``NAME``. The available policies are:
diff --git a/predictable_network_interfaces_with_systemd.md b/predictable_network_interfaces_with_systemd.md
@@ -1,6 +1,9 @@
+## ``/lib/systemd/network/99-default.link``
+
 ```sh
 sudo vim /lib/systemd/network/99-default.link
 ```
+### Original
 
 ```ini
 #  SPDX-License-Identifier: LGPL-2.1+
@@ -16,6 +19,8 @@ sudo vim /lib/systemd/network/99-default.link
 NamePolicy=kernel database onboard slot path
 MACAddressPolicy=persistent
 ```
+### Edited
+
 ```ini
 [Link]
 NamePolicy=mac path

diff --git a/predictable_network_interfaces_with_systemd.md b/predictable_network_interfaces_with_systemd.md
@@ -0,0 +1,23 @@
+```sh
+sudo vim /lib/systemd/network/99-default.link
+```
+
+```ini
+#  SPDX-License-Identifier: LGPL-2.1+
+#
+#  This file is part of systemd.
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU Lesser General Public License as published by
+#  the Free Software Foundation; either version 2.1 of the License, or
+#  (at your option) any later version.
+
+[Link]
+NamePolicy=kernel database onboard slot path
+MACAddressPolicy=persistent
+```
+```ini
+[Link]
+NamePolicy=mac path
+MACAddressPolicy=none
+```
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