packet delay because of blackhole

Just for somebody convince.

While analyzing client<->server HTTPS conversation one second delay in
packet exchange was discovered (strongly reproducible):

Sample:
N time
6 0.002303 10.28.4.14 10.28.4.50 SSL Client Hello
7 0.106710 10.28.4.50 10.28.4.14 TCP 443 > 1447 [ACK] Seq=1 Ack=103 Win=65535 Len=0
8 1.045712 10.28.4.50 10.28.4.14 TLSv1 Server Hello, Certificate, Server Hello Done

Another sample:
10 0.011722 10.28.4.14 10.28.4.50 TLSv1 Application Data
11 0.115933 10.28.4.50 10.28.4.14 TCP 443 > 1442 [ACK] Seq=839 Ack=519 Win=65466 Len=0
12 1.054037 10.28.4.50 10.28.4.14 TLSv1 Application Data

The reason for delay is sysctl tcp.blackhole value grater than 0, much to surprise.

So, turning tcp.blackhole to 0 eliminate any delay (strongly reproducible).

System: FreeBSD 6_2_stable

--
Best regards,
Anthony mailto:ap00@xxxxxxx


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