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--- examples/bsd/vip-up.sh.orig 2006-05-27 20:38:34.000000000 +0000
+++ examples/bsd/vip-up.sh 2010-05-30 20:40:19.000000000 +0000
@@ -1,4 +1,21 @@
#! /bin/sh
+
+if [ -z "$1" -o -z "$2" ]; then
+ cat <<EOF
+Usage: ${0##*/} interface virtual-address [if-keep-ip]
+ interface - interface name where virtual IP-address to be assigned;
+ virtual-address - virtual IP-address;
+ if-keep-ip - interface name where virtual IP-address should be kept
+ when ucarp changes state to BACKUP;
+
+EOF
+ exit 255
+fi
+
exec 2> /dev/null
+if [ ! -z "$3" ]; then
+ /sbin/ifconfig "$3" -alias "$2"
+fi
+
/sbin/ifconfig "$1" alias "$2" netmask 255.255.255.255
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