TCP SACK issue, hung connection, tcpdump included

2007-07-28 Thread Darryl L. Miles
CLIENT = Linux 2.6.20.1-smp [Customer build] SERVER = Linux 2.6.9-55.ELsmp [Red Hat Enterprise Linux AS release 4 (Nahant Update 5)] The problems start around time index 09:21:39.860302 when the CLIENT issues a TCP packet with SACK option set (seemingly for a data segment which has already bee

Re: TCP SACK issue, hung connection, tcpdump included

2007-07-29 Thread Darryl L. Miles
This is a reproducible problem (would take me between 30 mins and a day to reproduce it). Please feel free to provide me with tcpdump options to be sure I include to get the information you need. I've been informed there is no firewall at all, the only firewalling that takes place is the lo

Re: TCP SACK issue, hung connection, tcpdump included

2007-07-30 Thread Darryl L. Miles
I've been able to capture a tcpdump from both ends during the problem and its my belief there is a bug in 2.6.20.1 (at the client side) in that it issues a SACK option for an old sequence which the current window being advertised is beyond it. This is the most concerning issue as the integri