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From a81b5e8ec984ca2a8ee7167eb87f6fc9db737843 Mon Sep 17 00:00:00 2001
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From: "David Kaspar [Dee'Kej]" <dkaspar@redhat.com>
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Date: Mon, 10 Jul 2017 18:16:35 +0200
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Subject: [PATCH] ARPUPDATE introduced
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The ARPUPDATE option has been introduced. It defaults to 'yes'.
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By setting the ARPUPDATE to 'no', administrator can disable
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updating neighbouring computers with ARP information about current
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NIC. This is especially needed when using LVS Load Balancing with
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Direct routing enabled.
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---
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sysconfig.txt | 5 +++++
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sysconfig/network-scripts/ifup-aliases | 4 +++-
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sysconfig/network-scripts/ifup-eth | 2 +-
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sysconfig/network-scripts/network-functions | 6 ++++++
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4 files changed, 15 insertions(+), 2 deletions(-)
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diff --git a/sysconfig.txt b/sysconfig.txt
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index a4c05da..7adc381 100644
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--- a/sysconfig.txt
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+++ b/sysconfig.txt
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@@ -586,6 +586,11 @@ Files in /etc/sysconfig/network-scripts/
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If set to 'no', ifup will not try to determine, if requested ip address
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is used by other machine in network.
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Defaults to 'yes'.
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+ ARPUPDATE=yes|no
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+ If set to 'no' the neighbours in current network will not be updated with
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+ ARP information about this NIC. This is especially handy using LVS Load
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+ Balancing with Direct Routing enabled.
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+ Defaults to 'yes'.
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IPV4_FAILURE_FATAL=yes|no
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If set to yes, ifup-eth will end immediately after ipv4 dhclient fails.
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Defaults to 'no'.
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diff --git a/sysconfig/network-scripts/ifup-aliases b/sysconfig/network-scripts/ifup-aliases
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index fbc1547..52d43ea 100755
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--- a/sysconfig/network-scripts/ifup-aliases
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+++ b/sysconfig/network-scripts/ifup-aliases
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@@ -127,6 +127,7 @@ eval ` (
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echo default_GATEWAY=$GATEWAY\;;
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echo default_NO_ALIASROUTING=$NO_ALIASROUTING\;;
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echo default_ARPCHECK=$ARPCHECK\;;
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+ echo default_ARPUPDATE=$ARPUPDATE\;;
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) `
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[ -z "$default_GATEWAY" ] && default_GATEWAY=$network_GATEWAY
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@@ -142,6 +143,7 @@ function ini_env ()
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NO_ALIASROUTING=$default_NO_ALIASROUTING
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ONPARENT=""
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ARPCHECK=$default_ARPCHECK
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+ ARPUPDATE=$default_ARPUPDATE
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}
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function is_default_gateway ()
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@@ -279,7 +281,7 @@ function new_interface ()
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dev ${parent_device} label ${DEVICE}
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# update ARP cache of neighboring computers:
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- if [ "${REALDEVICE}" != "lo" ]; then
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+ if ! is_false "${ARPUPDATE}" && [ "${REALDEVICE}" != "lo" ]; then
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/sbin/arping -q -A -c 1 -I ${parent_device} ${IPADDR}
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( sleep 2; /sbin/arping -q -U -c 1 -I ${parent_device} ${IPADDR} ) > /dev/null 2>&1 < /dev/null &
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fi
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diff --git a/sysconfig/network-scripts/ifup-eth b/sysconfig/network-scripts/ifup-eth
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index 3da5c16..5096a5d 100755
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--- a/sysconfig/network-scripts/ifup-eth
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+++ b/sysconfig/network-scripts/ifup-eth
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@@ -274,7 +274,7 @@ else
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fi
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# update ARP cache of neighboring computers
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- if [ "${REALDEVICE}" != "lo" ]; then
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+ if ! is_false "${arpupdate[$idx]}" && [ "${REALDEVICE}" != "lo" ]; then
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/sbin/arping -q -A -c 1 -I ${REALDEVICE} ${ipaddr[$idx]}
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( sleep 2;
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/sbin/arping -q -U -c 1 -I ${REALDEVICE} ${ipaddr[$idx]} ) > /dev/null 2>&1 < /dev/null &
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diff --git a/sysconfig/network-scripts/network-functions b/sysconfig/network-scripts/network-functions
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index 1867c38..7f5dfb0 100644
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--- a/sysconfig/network-scripts/network-functions
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+++ b/sysconfig/network-scripts/network-functions
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@@ -222,6 +222,7 @@ expand_config ()
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netmask[$i]=$(eval echo '$'NETMASK$idx)
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broadcast[$i]=$(eval echo '$'BROADCAST$idx)
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arpcheck[$i]=$(eval echo '$'ARPCHECK$idx)
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+ arpupdate[$i]=$(eval echo '$'ARPUPDATE$idx)
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if [ "${prefix[$i]}x" != "x" ]; then
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val=$(/bin/ipcalc --netmask "${ipaddr[$i]}/${prefix[$i]}")
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@@ -248,6 +249,11 @@ expand_config ()
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arpcheck[$i]=${arpcheck[$i],,*}
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fi
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+ if [ "${arpupdate[$i]}x" != "x" ]; then
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+ arpupdate[$i]=${arpupdate[$i]##ARPUPDATE=}
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+ arpupdate[$i]=${arpupdate[$i],,*}
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+ fi
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+
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i=$((i+1))
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done
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--
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2.9.5
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