with sysctl net.inet.tcp.rfc1644 = 0, the transaction uses only 6 packets and it's less than 1 sec, setting net.inet.tcp.rfc1644 to 1 uses 8 packets and takes more than 1 sec.
with net.inet.tcp.rfc1644 = 1:
No. Time Source Destination Protocol Info
1 0.000000 132.65.80.32 132.65.16.103 TCP 4108 >
255 [FIN, SYN, PSH] Seq=967743282 Ack=0 Win=57600 Len=25
132.65.80.32 -> 132.65.16.103: "I'm trying to use TTCP. Here's my request."
2 0.000036 132.65.16.103 132.65.80.32 TCP 255 >
4108 [SYN, ACK] Seq=99082279 Ack=967743283 Win=57344 Len=0
132.65.16.103 -> 132.65.80.32: "Uh, hello. I don't know what TTCP is, could you try saying something I understand?"
Whereupon 132.65.80.32 reverts to normal behaviour, and uses the same 6 packets as it would if TTCP were disabled.
Colin Percival
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