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-rw-r--r--sysconfig.txt4
-rwxr-xr-xsysconfig/network-scripts/ifup-aliases9
2 files changed, 13 insertions, 0 deletions
diff --git a/sysconfig.txt b/sysconfig.txt
index 7746671c..4d87599d 100644
--- a/sysconfig.txt
+++ b/sysconfig.txt
@@ -586,6 +586,10 @@ Files in /etc/sysconfig/network-scripts/
Network zone (trust level) of this connection.
If not set, default zone (specified in /etc/firewalld/firewalld.conf)
is used. To see all available zones, run 'firewall-cmd --get-zones'.
+ ARPCHECKn=yes|no
+ If set to 'no', ifup will not try to determine, if requested ip address
+ is used by other machine in network.
+ Defaults to 'yes'.
For dynamic addressing (BOOTPROTO=dhcp) only DEVICE needs to
be set; all the rest will be determined by the boot protocol.
diff --git a/sysconfig/network-scripts/ifup-aliases b/sysconfig/network-scripts/ifup-aliases
index a647044f..8a59dd0a 100755
--- a/sysconfig/network-scripts/ifup-aliases
+++ b/sysconfig/network-scripts/ifup-aliases
@@ -139,6 +139,7 @@ function ini_env ()
GATEWAY=$default_GATEWAY
NO_ALIASROUTING=$default_NO_ALIASROUTING
ONPARENT=""
+ ARPCHECK=""
}
function is_default_gateway ()
@@ -256,6 +257,14 @@ function new_interface ()
fi
if [ "$setup_this" = "yes" ] ; then
+ [ "${parent_device}" != "lo" ] && [ "${ARPCHECK}" != "no" ] && \
+ is_available ${parent_device} && \
+ grep -qswi "up" /sys/class/net/${parent_device}/operstate && \
+ if ! /sbin/arping -q -c 2 -w 3 -D -I ${parent_device} ${IPADDR} ; then
+ net_log $"Error, some other host already uses address ${IPADDR}."
+ return 1
+ fi
+
/sbin/ip addr add ${IPADDR}/${PREFIX} brd ${BROADCAST} dev ${parent_device} label ${DEVICE}
[ "$IPV6INIT" = "yes" ] && /etc/sysconfig/network-scripts/ifup-ipv6 ${DEVICE}