From mboxrd@z Thu Jan 1 00:00:00 1970 From: Grant Taylor Subject: Re: not sure ESTABLISHED TCP traffic will have ACK flag setalways... Date: Sun, 10 Apr 2005 00:09:55 -0500 Message-ID: <4258B523.9070902@riverviewtech.net> References: <1112975844.3544.94.camel@seberino.spawar.navy.mil> <20050408205224.GA15635@vetz.homelinux.org> <006901c53c7e$2ead1c90$f5001eac@riverview.office> <20050409062431.GA17505@spawar.navy.mil> <42582017.5030402@riverviewtech.net> <20050410032308.GA20000@spawar.navy.mil> Reply-To: gtaylor@riverviewtech.net Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20050410032308.GA20000@spawar.navy.mil> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: netfilter-bounces@lists.netfilter.org Errors-To: netfilter-bounces@lists.netfilter.org Content-Type: text/plain; charset="us-ascii"; format="flowed" To: seberino@spawar.navy.mil Cc: netfilter@lists.netfilter.org > Grant > > Wow! Thanks again. You cleared up the last missing piece about ACKs! > So the slow side can ACK multiple sequence numbers with a single > packet. Likewise, the /fast/ side can send multiple ACKs for > the same repetitive sequence number. That makes perfect sense. > > Now I believe that TCP packets can all have ACKs set on an > ESTABLISHED connection. > > Chris > > P.S. BTW, I'm curious how you knew this level of great info. Did you > carefully read through RFC 793? That was jam packed with info but > hard to digest fully. No, I cant say as I recall reading RFC 793 in particular, though I do read a LOT of RFC pertaining to what I do, I'm a systems administrator / consultant, so I need to know a lot about email (SMTP), DNS, www (HTTP), etc. I spend a lot of time helping others get their system up to speck thus I've run across a lot of not quite up to spec but close enough to work *most* of the time. I get called when it does not. If ever I run across things that I don't know about (and it happens more than you might think) I turn to RFC, Google (this is a REALLY BIG ONE), and peers in the industry on mail lists like this one. It's not what you know, it's who you know to ask. :) Grant. . . .