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Re: Linux TCP/IP stack

To: netdev@xxxxxxxxxxx
Subject: Re: Linux TCP/IP stack
From: Rabeeh Khoury <rabeeh@xxxxxxxxxxxxx>
Date: Thu, 26 Jul 2001 14:58:06 +0300
Cc: Rabeeh Khoury <rabeeh@xxxxxxxxxxxxx>, ramic@xxxxxxxxxxxxx
Organization: Galileo Technology
References: <3B5FFCD7.1070602@xxxxxxxxxxxxx>
Sender: owner-netdev@xxxxxxxxxxx
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.2) Gecko/20010628
I'm using kernel 2.2.14

Rabeeh Khoury wrote:

Hi All,

I have noticed (using tcpdump and simple TCP client-server application)
that TCP frame are always sent with ACK flag even if the sender doesn't
receive new frames (i.e. it send the same Acknowledgment Number).

RFC 2581 (section 4.1) states that:
  "A TCP receiver MUST NOT generate more than one ACK for every
  segment, other than to update the offered window as the receiving
  application consumes new data"

According to the above statement it seems that LINUX TCP / IP violates this rule.

Thanks, Rami


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