Hi,
Here some output from tcpdump (qmail-ldap is on 10.1.1.242)
14:47:35.603770 IP 10.1.1.232.54339 > 10.1.1.7.ldap: S 31007374:31007374(0) win 65535 <mss 1460,nop,nop,sackOK,nop,wscale 1,nop,nop,timestamp 1213462 0>
14:47:35.604238 IP 10.1.1.7.ldap > 10.1.1.232.54339: S 3130696555:3130696555(0) ack 31007375 win 65535 <mss 1460,nop,wscale 0,nop,nop,timestamp 0 0,nop,nop,sackOK>
14:47:35.604280 IP 10.1.1.232.54339 > 10.1.1.7.ldap: . ack 1 win 33304 <nop,nop,timestamp 1213462 0>
14:47:35.604348 IP 10.1.1.232.54339 > 10.1.1.7.ldap: P 1:73(72) ack 1 win 33304 <nop,nop,timestamp 1213462 0>
14:47:35.606936 IP 10.1.1.7.ldap > 10.1.1.232.54339: P 1:23(22) ack 73 win 65463 <nop,nop,timestamp 4594074 1213462>
14:47:35.607102 IP 10.1.1.232.54339 > 10.1.1.7.ldap: P 73:275(202) ack 23 win 33304 <nop,nop,timestamp 1213462 4594074>
14:47:35.608795 IP 10.1.1.7.ldap > 10.1.1.232.54339: P 23:458(435) ack 275 win 65261 <nop,nop,timestamp 4594074 1213462>
14:47:35.707827 IP 10.1.1.232.54339 > 10.1.1.7.ldap: . ack 458 win 33201 <nop,nop,timestamp 1213473 4594074>
<Look five second here before sending the data>
14:47:40.955095 IP 10.1.1.232.54339 > 10.1.1.7.ldap: P 275:282(7) ack 458 win 33304 <nop,nop,timestamp 1213997 4594074>
14:47:40.955130 IP 10.1.1.232.54339 > 10.1.1.7.ldap: F 282:282(0) ack 458 win 33304 <nop,nop,timestamp 1213997 4594074>
14:47:40.955287 IP 10.1.1.232.53539 > 10.1.1.7.ldap: S 2128629471:2128629471(0) win 65535 <mss 1460,nop,nop,sackOK,nop,wscale 1,nop,nop,timestamp 1213997 0>
14:47:40.955592 IP 10.1.1.7.ldap > 10.1.1.232.54339: F 458:458(0) ack 282 win 65254 <nop,nop,timestamp 4594128 1213997>
14:47:40.955626 IP 10.1.1.232.54339 > 10.1.1.7.ldap: F 282:282(0) ack 459 win 33303 <nop,nop,timestamp 1213997 4594128>
14:47:40.955663 IP 10.1.1.7.ldap > 10.1.1.232.54339: . ack 283 win 65254 <nop,nop,timestamp 4594128 1213997>
14:47:40.955807 IP 10.1.1.7.ldap > 10.1.1.232.53539: S 1456763827:1456763827(0) ack 2128629472 win 65535 <mss 1460,nop,wscale 0,nop,nop,timestamp 0 0,nop,nop,sackOK>
14:47:40.955830 IP 10.1.1.232.53539 > 10.1.1.7.ldap: . ack 1 win 33304 <nop,nop,timestamp 1213997 0>
14:47:40.955873 IP 10.1.1.232.53539 > 10.1.1.7.ldap: P 1:93(92) ack 1 win 33304 <nop,nop,timestamp 1213997 0>
14:47:40.958823 IP 10.1.1.7.ldap > 10.1.1.232.53539: P 1:23(22) ack 93 win 65443 <nop,nop,timestamp 4594128 1213997>
14:47:40.958903 IP 10.1.1.232.53539 > 10.1.1.7.ldap: P 93:100(7) ack 23 win 33304 <nop,nop,timestamp 1213998 4594128>
14:47:40.958920 IP 10.1.1.232.53539 > 10.1.1.7.ldap: F 100:100(0) ack 23 win 33304 <nop,nop,timestamp 1213998 4594128>
14:47:40.959616 IP 10.1.1.7.ldap > 10.1.1.232.53539: . ack 101 win 65436 <nop,nop,timestamp 4594128 1213998>
14:47:40.959626 IP 10.1.1.7.ldap > 10.1.1.232.53539: F 23:23(0) ack 101 win 65436 <nop,nop,timestamp 4594128 1213998>
14:47:40.959693 IP 10.1.1.232.53539 > 10.1.1.7.ldap: . ack 24 win 33303 <nop,nop,timestamp 1213998 4594128>
as you can see we have a hole of five seconds without reason and its happens very often, so the performance of the mail server is really bad. So, any idea to solve this problem?
Thank you
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