Correct rp_filter help text.

[Dave Jones <davej@redhat.com>]

As mentioned in http://bugzilla.kernel.org/show_bug.cgi?id=5015
The helptext implies that this is on by default.
This may be true on some distros (Fedora/RHEL have it enabled
in /etc/sysctl.conf), but the kernel defaults to it off.

Signed-off-by: Dave Jones <davej@redhat.com>

diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index c68196c..420d7a4 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -43,11 +43,11 @@ config IP_ADVANCED_ROUTER
 	  asymmetric routing (packets from you to a host take a different path
 	  than packets from that host to you) or if you operate a non-routing
 	  host which has several IP addresses on different interfaces. To turn
-	  rp_filter off use:
+	  rp_filter on use:
 
-	  echo 0 > /proc/sys/net/ipv4/conf/<device>/rp_filter
+	  echo 1 > /proc/sys/net/ipv4/conf/<device>/rp_filter
 	  or
-	  echo 0 > /proc/sys/net/ipv4/conf/all/rp_filter
+	  echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter
 
 	  If unsure, say N here.
 

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