Re: Measuring bandwidth, bad packets, latency

[<joseph.kaye () cox net>]

JM
I usually do this for a video stream looking for similiar information.

Highlight a packet in the stream, Right Click it and do a Follow TCP Stream. 
I usually look only on one direction at a time 
so filter "ip.src == x.x.x.x" 
Once done add this to the filter 
"ip.src == x.x.x.x and tcp.analysis.retransmission" 
apply it, go to Statistics - Summary and you should see the bw and errors.
You can change the filters for each direction, or one direction at a time. The difference with or without the 
retransmission statement can give you the bw with and without the errors.

Also on the status line at the bottom is the expert button. Use it to give you some more info on what you are looking 
at. It breaks it down a little.  
 

---- JM <hondgm () yahoo com> wrote: 
> Hello,
> We're going to do some Ethernet physical layer testing, basically testing the effects of different types of cable 
> (for industrial/automotive).  For the most part, this will simply involve a single link with varying qualities of 
> cable between the two PCs.  
>
> Since I've already used Wireshark to analyze packets, I was thinking maybe it could also do this.  I've done some 
> searching, but didn't find much.  What I'd like to have is two computers, or maybe just one with two NICs, send 
> traffic through the link and report what the throughput, latency, error rate, etc is.  
>
> If Wireshark isn't able to do this, or if an add-on isn't available, does anyone have any suggestions?  Free/open 
> source is of course preferred. 




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