From 11b5fe6e9cb1babd68f1b56e44767fc018df3acd Mon Sep 17 00:00:00 2001
From: Franco Fichtner <franco@opnsense.org>
Date: Tue, 13 Jul 2021 12:45:05 +0200
Subject: [PATCH] interfaces: deprecate SLAAC addresses on linkdown; closes
 #4929

---
 src/opnsense/scripts/interfaces/ppp-linkdown.sh | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/opnsense/scripts/interfaces/ppp-linkdown.sh b/src/opnsense/scripts/interfaces/ppp-linkdown.sh
index f5f3e4d5d..5b9593cb4 100755
--- a/src/opnsense/scripts/interfaces/ppp-linkdown.sh
+++ b/src/opnsense/scripts/interfaces/ppp-linkdown.sh
@@ -54,6 +54,11 @@ elif [ "${AF}" = "inet6" ]; then
 
 	# Do not remove gateway used during filter reload.
 	rm -f /tmp/${IF}_routerv6 /tmp/${IF}upv6 /tmp/${IF}_ipv6
+
+	# deprecate all previous SLAAC addresses
+	ifconfig ${IF} | grep autoconf | while read FAMILY ADDR MORE; do
+		ifconfig ${IF} ${FAMILY} ${ADDR} deprecated
+	done
 fi
 
 daemon -f /usr/local/opnsense/service/configd_ctl.py dns reload