NDT-DEV email list created

Revision: 604
Author:   

Date:     Thu Sep  8 02:53:47 2011
Log:      Explained the difference between the Next Sequence Number and the  
Maximum Next Sequence Number values.
http://code.google.com/p/ndt/source/detail?r=604

Modified:
 /wiki/NDTTestMethodology.wiki

=======================================
--- /wiki/NDTTestMethodology.wiki       Mon Sep  5 04:07:29 2011
+++ /wiki/NDTTestMethodology.wiki       Thu Sep  8 02:53:47 2011
@@ -60,7 +60,7 @@

 The formula used to find out when to temporarily stop sending packets is  
probably wrong. The idea was to use this as a part of the duplex mismatch  
detection, with a max of 2 packets in flight the Ethernet half-duplex  
sender should never see a collision so the throughput would be higher even  
though the buffer is limited.

-However, the formula allows for more packets in flight and it uses `"Next  
Sequence Number To Be Sent"` instead of `"Maximum Value of Next Sequence  
Number To Be Sent"`.
+However, the formula allows for more packets in flight and it uses the  
`"Next Sequence Number To Be Sent"` instead of the `"Maximum Value of Next  
Sequence Number To Be Sent"`. The difference between these values is that  
the first one is not monotonic (and thus not a counter) because TCP  
sometimes retransmits lost data by pulling the Next Sequence Number back to  
the missing data. The latter one is the farthest forward (right most or  
largest) value of the Next Sequence Number. These values are the same  
except the situation when the Next Sequence Number is pulled back during  
recovery.

 === Simple Firewall Test ===