networkd: avoid managing veth dev MAC addresses

When a veth device is created, the CNI in charge of bringing the device up will set a MAC address, if `MACAddressPolicy=permanent` is set, systemd will change it to a different one, causing dropped packets due to mismatches. With this change, the address set when the device is created will remain untouched by systemd. See flatcar/Flatcar#278 for more information.
flatcar · Jan 4, 2021 · 5109cdf · 5109cdf
1 parent c65fe54
commit 5109cdf
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/systemd/network/50-veth.link b/systemd/network/50-veth.link
@@ -0,0 +1,6 @@
+# Prevent systemd-networkd from handling the MACAddresses of veth devices
+[Match]
+Driver=veth
+
+[Link]
+MACAddressPolicy=none