Date: Wed, 10 Jun 2009 19:17:13 +0530 (IST) From: saravana perumal <seesaravanan@yahoo.co.in> To: freebsd-net@freebsd.org Cc: sarbalas@gmail.com Subject: TCP Free-BSD setup behaviour. Message-ID: <28959.63465.qm@web8313.mail.in.yahoo.com>
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=A0Hi , =A0 =A0 Have some behaviour change=A0 with FREEBSD=A0 compared to=A0 LINUX . 1. When sending the Same=A0 TCP packet once again [ Retranmission of TCP pa= cket ] Whether the Same Identification field [ IP packet]used or not . but when seeing that thru packet capture, Free BSD sending the differnt one= [ increases sequentially IP Identification] 2.Retranmission Time is not increasing Linearly with Respect to BSD. not ke= eping more time interval . AS per RFC=20 expecting Retransmission timeout should=A0 increase Linearly. Issue is not = seen with Linux Setup 3. Active SYN open state in FREE BSD setup=A0, Does not reach Syn-received = State. When Sending syn packet to DUT but=A0 for that FreeBSD is not sendin= g back=20 SYN/ACK .=A0 Issue is with Free BSD Setup.Linux works fine, =A0 4.When checking the State - TIME-WAIT=20 =A0 Sending FIN and expecting the ACK ;Getting the ACK properly. =A0 Sending Data Segment and Expecting the RST signal not getting the RST ;= Instead DUT is sending the Last TCP packet. =A0 Issue seen only in Free BSD. =A0 Same issue in FIN-WAIT2=A0 & FIN-WAIT1 State also . =A0 Sending FIN and Expect the ACK : Getting the ACK =A0 Sending Data segment with Data : Expecting the RST signal from DUT ; bu= t got Last transmitted TCP packet[ FIN -ACK] =A0 Any idea about the above scenario would be helpful =A0 Thanks, Saravanan.=0A=0A=0A
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