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lvpin Lv
Beginner

About TCP Simultaneous Close

Hello everyone I am a for students from China, here is my problem, my English is not good, this is done by google translate.

 

Lab Topology

 

 

Environment

RHEL6.3 server + sock 0.3.2

Host 1.1.1.1    Entry  sock -v  -b 12345  2.2.2.2 43415

Host 2.2.2.2    Entry  sock -v  -b sock -v -y 3000 -b 43415  1.1.1.1 12345    

//#:  -y n  #ms for SO_SNDTIMEO (send timeout)

 

 

Theoretical Results That RFC Can Be Described Within The Framework of

 

Come From

RFC 793(Page 37)    and     《The TCP/IP Guide Version 3.0》(page 886 “Simultaneous Connection Termination”)

 

The truth of the matter was quite different .

Only Host 2.2.2.2 Reply ACK。Several attempts Failure。Does not appear, RFC 793 described phenomenon。

 

 

Doubt?

No.3  and No.4  Time Interval  0.04900300-0.01900100 = 0.030002======>TCP Simultaneous Open Result Full

No.19  and No.20  Time Interval  56.2792190-56.2762190 = 0.003======>TCP Simultaneous Connection Result Bad

I Do Not Know Where The Wrong?

 

 

Guess!?

If Host 1.1.1.1 The first receive the ACK ,From  CLOSING—>TIME-WAIT,Once go in TIME-WAIT Status ,TCP Stop Send Package(ACK) ?

 

 

 

 

Hoping to be answered here

Sincerely Blessing

Regards

    

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