Update networkmanager privacy configs

root/etc/sysctl.d/40-ipv6-privacy.conf

@@ -0,0 +1,27 @@
+# Enable IPv6 temporary addresses (RFC 4941).
+#
+# On IPv6 networks using SLAAC (Stateless Address Autoconfiguration),
+# hosts automatically generate their own addresses from the advertised
+# network prefix. Normally this results in a single stable address that
+# remains constant for the duration of the connection.
+#
+# Temporary addresses add additional short-lived IPv6 addresses that are
+# periodically regenerated by the kernel. These addresses are preferred
+# for outgoing connections (for example web browsing) so that remote
+# services cannot reliably track a device by its stable IPv6 address.
+#
+# The stable address still exists and is used for:
+#   - inbound connections
+#   - local services
+#   - neighbor discovery
+#
+# Values:
+#   0 = disable temporary addresses
+#   1 = enable temporary addresses but prefer the stable address
+#   2 = enable temporary addresses and prefer them for outbound traffic
+#
+# "default" applies to interfaces created after boot, while "all"
+# applies the setting to existing interfaces as well.
+
+net.ipv6.conf.default.use_tempaddr = 2
+net.ipv6.conf.all.use_tempaddr = 2