[ns] Why TCP's t_seqno does not decreasing?
ysch0i at ieee.org
Fri Feb 6 05:42:36 PST 2004
I want to plot seqno. vs time(figure likes W. R. Stevens, TCP/IP Illustrated
Vol. 1, Figure 21.6.)
I used Polly Huang's red.tcl example(http://nile.wpi.edu/NS/Example/red.tcl)
and simply add following code
set tcpxxx [open xxx.dat w]
$tcp1 attach $tcpxxx
$tcp1 trace cwnd_
$tcp1 trace t_seqno_
As far as I understand, t_seqno_ is "next pkt to send"
So when tcp restransmission, t_seqno_ motion down.
But results are strange for me.
Although there are some pkt losses(and ECN is not enabled), t_seqno_ does
not decrease. it simply monotonously increases.
What am I missing?
Thanks a lot in advance,
And with best regards...
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