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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 ab87578e..8a5a6065 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