diff -U3 ethernet.orig ethernet
--- ethernet.orig	2011-08-09 01:29:16.000000000 +0300
+++ ethernet	2011-08-13 18:53:30.977442700 +0300
@@ -127,6 +127,8 @@
         done
     fi
 
+
+if [ -d /proc/sys/net/ipv6 ]; then # Verify to IPv6 loaded
     case "$IP6" in
     dhcp*)
         if [[ -x /usr/sbin/dhclient ]]; then
@@ -185,6 +187,7 @@
         report_iproute "IP6 must be 'dhcp', 'dhcp-noaddr', 'stateless', 'static' or 'no'"
         ;;
     esac
+fi
 
     # Set hostname
     if [[ -n "$HOSTNAME" ]]; then