Messages in this thread | | | Date | Tue, 18 Dec 2007 15:28:36 -0500 | From | Chuck Ebbert <> | Subject | Re: After many hours all outbound connections get stuck in SYN_SENT |
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On 12/18/2007 02:45 PM, James Nichols wrote: > > I've run tcpdump for all IPs during this problem. I haven't tried > doing it for a single explicit IP address- due to the nature of the > workload it's very difficult to know which IPs will be hit at any > given moment. What I did see in the full IP captures is that the > returning ACKs don't show up in the packet capture. Unfortunately, > tcpdump reported that some packets were dropped during the capture. > Is it possible that the kernel was dropping the packets before they > could be captured by tcpdump? >
The only way to get a reliable trace is to run a capture from a port mirror on the switch the server is connected to. Capturing from inside the server at the same time and comparing the traces could be useful.
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