From: Will Woods <wwoods@redhat.com>
Date: Thu, 28 Aug 2014 17:44:47 +0000 (-0400)
Subject: do 'ip route replace default' instead of 'add'
X-Git-Tag: RHEL-7.1~17
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=aa5313ca0e17bb08dd0629c3f9385672408caceb;p=thirdparty%2Fdracut.git

do 'ip route replace default' instead of 'add'

When you define the gateway for an interface, dracut sets it up with:

  ip route add default via $gw dev $netif

If a default route is already set (e.g. if you have multiple NICs), this
will fail with the message "RTNETLINK answers: File exists".

So, if your first NIC isn't usable as a default route

Using "ip route replace default" instead allows ifup/dhclient-script to
correctly change the default route to the new interface.
---

diff --git a/modules.d/40network/dhclient-script.sh b/modules.d/40network/dhclient-script.sh
index ba05250de..885303a2c 100755
--- a/modules.d/40network/dhclient-script.sh
+++ b/modules.d/40network/dhclient-script.sh
@@ -45,7 +45,7 @@ setup_interface() {
         valid_lft ${lease_time} preferred_lft ${lease_time} \
         dev $netif
 
-    [ -n "$gw" ] && echo ip route add default via $gw dev $netif > /tmp/net.$netif.gw
+    [ -n "$gw" ] && echo ip route replace default via $gw dev $netif > /tmp/net.$netif.gw
 
     [ -n "${search}${domain}" ] && echo "search $search $domain" > /tmp/net.$netif.resolv.conf
     if  [ -n "$namesrv" ] ; then
diff --git a/modules.d/40network/ifup.sh b/modules.d/40network/ifup.sh
index 43e84a2c1..67b1d9f8b 100755
--- a/modules.d/40network/ifup.sh
+++ b/modules.d/40network/ifup.sh
@@ -145,7 +145,7 @@ do_static() {
         ip addr add $ip/$mask ${srv:+peer $srv} brd + dev $netif
     fi
 
-    [ -n "$gw" ] && echo ip route add default via $gw dev $netif > /tmp/net.$netif.gw
+    [ -n "$gw" ] && echo ip route replace default via $gw dev $netif > /tmp/net.$netif.gw
     [ -n "$hostname" ] && echo "echo $hostname > /proc/sys/kernel/hostname" > /tmp/net.$netif.hostname
 
     return 0