Advertise lost prefixes with pref_time == 0 for 2 hours.
diff --git a/CHANGELOG b/CHANGELOG
index fec5d6d..62b1107 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -71,6 +71,14 @@
Make --clear-on-reload apply to setting upstream servers
via DBus too.
+ When the address which triggered the construction of an
+ advertised IPv6 prefix disappears, continue to advertise
+ the prefix for up to 2 hours, with the preferred lifetime
+ set to zero. This satisfies RFC 6204 4.3 L-13 and makes
+ things work better if a prefix disappears without being
+ deprecated first. Thanks to Uwe Schindler for persuasively
+ arguing for this.
+
version 2.66
Add the ability to act as an authoritative DNS