NDT-DEV email list created

Revision: 575
Author:   

Date:     Thu Sep  1 05:51:41 2011
Log:      Added description of the NAT Detection and MSS Modifications  
heuristics.
http://code.google.com/p/ndt/source/detail?r=575

Modified:
 /wiki/NDTTestMethodology.wiki

=======================================
--- /wiki/NDTTestMethodology.wiki       Thu Sep  1 05:34:59 2011
+++ /wiki/NDTTestMethodology.wiki       Thu Sep  1 05:51:41 2011
@@ -209,6 +209,20 @@

 === NAT Detection ===

+The Network Address Translation (NAT) box is detected by the comparison of  
the client/server IP addresses visible from the server and the client boxes.
+
+When the server IP address visible to the client is different from the one  
known to the server itself, then the NAT box is modifying the server's IP  
address.
+
+Analogically, when the client IP address visible to the server is  
different from the one known to the client itself, then the NAT box is  
modifying the client's IP address.
+
+=== MSS Modifications ===
+
+The NDT checks packet size preservation by comparing the final value of  
the MSS variable in the MID test.
+
+When this variable's value is different than 1456, then the network  
middlebox had to change it during the test.
+
+When this variable's value is 1456, then it means that the packet size is  
preserved End-to-End.
+
 === Abnormal Conditions Detection ===

  * high packet loss