Re: TCP congestion

[Philip Lavine <source_route () yahoo com>]

I just don't understand how if there is 1 segment that gets lost how this could translate to such a catastrophic long 
period of slow-start. How can I minimize the impact of  the inevitable segment loss/out of order over a WAN. Is QoS the 
only option?

----- Original Message ----
From: Stephen Wilcox <steve.wilcox () packetrade com>
To: Philip Lavine <source_route () yahoo com>
Cc: nanog <nanog () merit edu>
Sent: Thursday, July 12, 2007 1:09:24 PM
Subject: Re: TCP congestion

Well, if its out of order its the same as if its lost or delayed, it needs to see that missing segment before the 
window is full

As mentioned you need to get dumps from both ends, you will almost definitely find that you have packet loss which 
tripped tcp's slow start mechanism.

Steve

On Thu, Jul 12, 2007 at 12:02:49PM -0700, Philip Lavine wrote:
> Even if the segment was received out of order what would cause congestion avoidance to starve the connection of 
> legitimate traffic for 15 to 20 seconds? That is the core of the problem.
>
> ----- Original Message ----
> From: Fred Baker <fred () cisco com>
> To: Brian Knoll <Brian.Knoll () tradingtechnologies com>
> Cc: Philip Lavine <source_route () yahoo com>; nanog <nanog () merit edu>
> Sent: Thursday, July 12, 2007 11:56:06 AM
> Subject: Re: TCP congestion
>
>
> On Jul 12, 2007, at 11:42 AM, Brian Knoll ((TTNET)) wrote:
>
> > If the receiver is sending a DUP ACK, then the sender either never
> > received the first ACK or it didn't receive it within the timeframe it
> > expected.
>
> or received it out of order.
>
> Yes, a tcpdump trace is the first step.
>
>
>
>
>
>        
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