Changes between Version 44 and Version 45 of GENIExperimenter/Tutorials/ClickExample/Execute

Timestamp:

07/16/14 14:36:55 (10 years ago)

Author:

sedwards@bbn.com

Comment:

--

GENIExperimenter/Tutorials/ClickExample/Execute

@@ -224 +224 @@
 ===  Packet transformation ===
 
-  i. The more interesting configuration appears here, in the '''top.click''' configuration file. In a local terminal type:
-  {{{
+  i. The more interesting configuration appears in the '''top.click''' configuration file. 
+
+{{{
+#!div style="background: #ffd; border: 3px ridge; width: 685px;"
+
+In a local terminal type:
+{{{
 ssh -A top "cat top.click"
 }}}
-  The output will look like : 
+The output will look like : 
   {{{
 #!cpp
@@ -266 +271 @@
 FromDevice(eth4) ->  Classifier(12/7744) -> Print(inR) -> restore;
 }}}
-
+}}}
   As indicated in the comments, the top portion of the configuration listens ('''!FromDevice''') for IP packets arriving on the interface connected to '''hostA''' (that's '''eth3''' in this example). It then creates a new 16-byte field at the head of the packet (two bytes added by the '''Unstrip''' operation, plus the existing 14-byte Ethernet header. It fills that field with what could be important routing instructions, but in this case is just graffiti ('''!StoreData'''). The '''route''' operation then routes the packet via either the '''left''' or '''right''' router toward '''hostB'''. In either case, it wraps the packet in a fresh Ethernet header ('''!EtherEncap''') with a distinctive ether type code (0x7744), logs the new packet on its way out ('''Print''') and sends it out on the correct interface ('''!ToDevice''').