From f35783c3fba244fea926528bc6d0a2ba4d1c44ad Mon Sep 17 00:00:00 2001
From: Beniamino Galvani <bgalvani@redhat.com>
Date: Wed, 18 Sep 2019 10:54:13 +0200
Subject: [PATCH] device: reset ip6_mtu on cleanup

ip6_mtu contains the MTU received through IPv6 autoconfiguration; it
should be reset when the connection is deactivated.

https://bugzilla.redhat.com/show_bug.cgi?id=1753128
(cherry picked from commit 353c7c95c1c664c024c4267e67ed2d4b57b44437)
---
 src/devices/nm-device.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/devices/nm-device.c b/src/devices/nm-device.c
index 67e23b8f96..0ece4f9465 100644
--- a/src/devices/nm-device.c
+++ b/src/devices/nm-device.c
@@ -14802,6 +14802,7 @@ nm_device_cleanup (NMDevice *self, NMDeviceStateReason reason, CleanupType clean
 	}
 
 	priv->mtu_source = NM_DEVICE_MTU_SOURCE_NONE;
+	priv->ip6_mtu = 0;
 	if (priv->mtu_initial || priv->ip6_mtu_initial) {
 		ifindex = nm_device_get_ip_ifindex (self);