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