From 4baac19e137c748deab6834ff676043de53c95dc Mon Sep 17 00:00:00 2001
From: Michael Stapelberg <stapelberg@google.com>
Date: Fri, 8 Jun 2018 16:50:27 +0200
Subject: [PATCH] radvd: skip advertisments when no prefixes are configured

---
 internal/radvd/radvd.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/internal/radvd/radvd.go b/internal/radvd/radvd.go
index bd51e8b..79a8590 100644
--- a/internal/radvd/radvd.go
+++ b/internal/radvd/radvd.go
@@ -153,6 +153,9 @@ func (o rdnss) Marshal() layers.ICMPv6Option {
 }
 
 func (s *Server) sendAdvertisement(addr net.Addr) error {
+	if s.prefixes == nil {
+		return nil // nothing to do
+	}
 	if addr == nil {
 		addr = &net.IPAddr{net.IPv6linklocalallnodes, s.iface.Name}
 	}