edit iptables

iptables/modules/ROOT/pages/index.adoc

@@ -88,7 +88,7 @@ iptables is the user utility which allows you to work with these chains/rules.
 .Understanding how iptables works
 [NOTE]
 ====
-The key to understanding how iptables works is 
+The key to understanding how iptables works is  this chart
 
 image::ROOT:tables_traverse.jpg[this chart,float=right]
 
@@ -105,7 +105,8 @@ Some packets
 
 - while other packets are generated by local processes; hence start at **Local Process** and proceed downward through the flowchart.  
 
-A detailed explanation http://docs.swarmlab.io/lab/sec/ex-3a_iptables-flow-chart.adoc.html[here].
+A detailed explanation 
+xref:ROOT:index-iptables.adoc[here]
 ====
 
 In the vast majority of use cases you won't need to use the **raw**, **mangle**, or **security** tables at all.