RELENG_8 ignoring TCP window size? [Was: Re: Help for TCP understanding wanted, ACK-MSS-Window [Was: Re: best practice to watch TCP parms of established sockets]]

[Jeremy Chadwick]

On Thu, Feb 18, 2010 at 05:52:37PM +0100, Harald Schmalzbauer wrote:
> Stephen Hurd schrieb am 18.02.2010 17:18 (localtime):
> ...
> >one retransmit per five packets).  Is this what you're seeing?  If
> >you have a capture you could share covering a few seconds, I could
> >take a look and provide a better opinion.
> 
> Thanks for your help, here's a small snippet of the iperf session.
> There are hundreds od duplicate ACKs. I'm not sure how to understand
> that. Like mentioned, I have to refresh some TCP basics before I can
> do usefull tests.
> But perhaps you can confirm that this behaviour is intendend, or
> where the problem could be...

Could you please re-run this capture (you're presumably using tcpdump)
with the "-s 0" flag set?

Also, can you state which machine/OS type is associated with what IP
address?

-- 
| Jeremy Chadwick                                   jdc at parodius.com |
| Parodius Networking                       http://www.parodius.com/ |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.              PGP: 4BD6C0CB |