From 6a593a24130421689ea8056626cb2bb07d89d947 Mon Sep 17 00:00:00 2001
From: Lukas Nykryn <lnykryn@redhat.com>
Date: Sun, 30 Oct 2016 17:26:29 +0100
Subject: ifup-aliases: send gratuitous ARPs when adding addresses

---
 sysconfig/network-scripts/ifup-aliases | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sysconfig/network-scripts/ifup-aliases b/sysconfig/network-scripts/ifup-aliases
index 7bf2327e..ad44964b 100755
--- a/sysconfig/network-scripts/ifup-aliases
+++ b/sysconfig/network-scripts/ifup-aliases
@@ -277,6 +277,12 @@ function new_interface ()
         /sbin/ip addr add ${IPADDR}/${PREFIX} brd ${BROADCAST} \
             dev ${parent_device} label ${DEVICE}
 
+        # update ARP cache of neighboring computers:
+        if [ "${REALDEVICE}" != "lo" ]; then
+            /sbin/arping -q -A -c 1 -I ${parent_device} ${IPADDR}
+            ( sleep 2; /sbin/arping -q -U -c 1 -I ${parent_device} ${IPADDR} ) > /dev/null 2>&1 < /dev/null &
+        fi
+
         ! is_false "$IPV6INIT" && \
             /etc/sysconfig/network-scripts/ifup-ipv6 ${DEVICE}
 
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