[lxc-devel] [lxd/master] lxd/device/nic/routed: Sets accept_ra=0 on host interface

[tomponline on Github]

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From 2fd6c03da466d10fbf982fac7fdd926be1ea7d81 Mon Sep 17 00:00:00 2001
From: Thomas Parrott <thomas.parrott at canonical.com>
Date: Fri, 27 Mar 2020 19:27:17 +0000
Subject: [PATCH] lxd/device/nic/routed: Sets accept_ra=0 on host interface

Signed-off-by: Thomas Parrott <thomas.parrott at canonical.com>
---
 lxd/device/nic_routed.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lxd/device/nic_routed.go b/lxd/device/nic_routed.go
index cbd1c73523..ba226eb5d4 100644
--- a/lxd/device/nic_routed.go
+++ b/lxd/device/nic_routed.go
@@ -281,6 +281,12 @@ func (d *nicRouted) postStart() error {
 	// inside the instance work and ensure that traffic doesn't periodically halt whilst ARP/NDP
 	// is re-detected.
 	if v["host_name"] != "" {
+		// Attempt to disable IPv6 router advertisement acceptance.
+		err := util.SysctlSet(fmt.Sprintf("net/ipv6/conf/%s/accept_ra", v["host_name"]), "0")
+		if err != nil {
+			return err
+		}
+
 		if d.config["ipv4.address"] != "" {
 			_, err := shared.RunCommand("ip", "-4", "addr", "add", fmt.Sprintf("%s/32", d.ipv4HostAddress()), "dev", v["host_name"])
 			if err != nil {