From: David Ahern <>

[ Upstream commit 4a6e3c5def13c91adf2acc613837001f09af3baa ]

ndisc_notify is the ipv6 equivalent to arp_notify. When arp_notify is
set to 1, gratuitous arp requests are sent when the device is brought up.
The same is expected when ndisc_notify is set to 1 (per ndisc_notify in
Documentation/networking/ip-sysctl.txt). The NA is not sent on NETDEV_UP
event; add it.

Fixes: 5cb04436eef6 ("ipv6: add knob to send unsolicited ND on link-layer 
address change")
Signed-off-by: David Ahern <>
Acked-by: Hannes Frederic Sowa <>
Signed-off-by: David S. Miller <>
Signed-off-by: Sasha Levin <>
 net/ipv6/ndisc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index a46c50423aec..2e9e0af9e759 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1646,6 +1646,8 @@ static int ndisc_netdev_event(struct notifier_block 
*this, unsigned long event,
                neigh_changeaddr(&nd_tbl, dev);
                fib6_run_gc(0, net, false);
+               /* fallthrough */
+       case NETDEV_UP:
                idev = in6_dev_get(dev);
                if (!idev)

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