From 38180271c587f3053710bf38a6cda829d3a7c00f Mon Sep 17 00:00:00 2001

From: Harald Hoyer <harald@redhat.com>

Date: Tue, 18 Aug 2015 12:07:41 +0200

Subject: [PATCH] network/ifup.sh: arping for static IPv4 addresses

---

 modules.d/40network/ifup.sh | 4 ++++

 1 file changed, 4 insertions(+)

diff --git a/modules.d/40network/ifup.sh b/modules.d/40network/ifup.sh

index ab87578..8a5a606 100755

--- a/modules.d/40network/ifup.sh

+++ b/modules.d/40network/ifup.sh

@@ -163,6 +163,10 @@ do_static() {

         ip addr add $ip/$mask ${srv:+peer $srv} dev $netif

         wait_for_ipv6_dad $netif

     else

+        if ! arping -f -q -D -c 2 -I $netif $ip; then

+            warn "Duplicate address detected for $ip for interface $netif."

+            return 1

+        fi

         ip addr flush dev $netif

         ip addr add $ip/$mask ${srv:+peer $srv} brd + dev $netif

     fi