Date: Thu, 18 Feb 2010 09:18:40 -0800 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: freebsd-stable@freebsd.org Subject: Re: 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]] Message-ID: <20100218171840.GA60610@icarus.home.lan> In-Reply-To: <4B7D7055.3060601@omnilan.de> References: <4B7C1365.9070806@omnilan.de> <70CD649D-7659-4CE2-A16C-49B8C891CB5B@mac.com> <4B7C4066.5040006@omnilan.de> <4B7D3938.1000309@omnilan.de> <4B7D5AC4.9020509@mahan.org> <4B7D61DE.2020906@omnilan.de> <4B7D6635.20605@sasktel.net> <4B7D6857.80902@sasktel.net> <4B7D7055.3060601@omnilan.de>
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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@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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