Need some Info.

From: Shashank (shashank@evl.uic.edu)
Date: 01/15/01

  • Next message: Simon Leinen: "Re: Need some Info." 

    Date: Mon, 15 Jan 2001 12:26:57 -0600 (CST)
From: Shashank <shashank@evl.uic.edu>
Subject: Need some Info.
Message-ID: <Pine.SGI.3.95.1010115121937.1937001N-100000@laurel.evl.uic.edu>

    Hi All,

    I need to find out what the following options mean.. Please let me know if
    anyone has any information on them .

    Below is a tcodump output.

    *************************************************************************
    13:49:47.544632 172.21.21.23.1043 > 172.22.22.24.5555: S
    1846530079:1846530079(0) win 16384
    <mss 9140,nop,wscale 0,nop,nop,timestamp 19346 0,[|tcp]> (DF)
    13:49:47.751277 172.22.22.24.5555 > 172.21.21.23.1043: S
    3166086983:3166086983(0) ack 1846530080 win 65535
    <mss 9140,nop,wscale2,nop,nop,timestamp 6121395 19346,[|tcp]> (DF)
    13:49:47.751321 172.21.21.23.1043 > 172.22.22.24.5555: . ack 1 win 16384
    <nop,nop,timestamp 19346 6121395,nop,nop,cc 26> (DF)
    13:49:47.752346 172.21.21.23.1043 > 172.22.22.24.5555: P 1:2049(2048) ack
    1 win 16384 <nop,nop,timestamp 19346 6121395,nop,nop,cc 26> (DF)
    *************************************************************************

    1. What is the last option that is specified in the SYNC packet ([|tcp]),
    2. the "cc"option specifiesd in one of the data packets. It seems that
    this option is used by T/TCP, to minimize the number of segments exchanged
    in a single transation.. Is this correct??

    Thanks in advance,
    Shashank

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