From: Harald Hoyer <harald@redhat.com>
Date: Tue, 18 Aug 2015 10:07:41 +0000 (+0200)
Subject: network/ifup.sh: arping for static IPv4 addresses
X-Git-Tag: RHEL-7.2~55
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=38180271c587f3053710bf38a6cda829d3a7c00f;p=thirdparty%2Fdracut.git

network/ifup.sh: arping for static IPv4 addresses
---

diff --git a/modules.d/40network/ifup.sh b/modules.d/40network/ifup.sh
index ab87578e2..8a5a60651 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