Is there a utility/hack/patch that would allow a diligent sysadmin to obtain which specific TCP connections are generating retransmits and receiving packet drops? netstat will show me drops on an interface, but not on a specific source/dest pair?
If you've got a small enough amount of traffic, you could use tcpdump to snarf the headers and then use your favourite scripting languge to look for repeated sequence numbers (retransmits) and repeated acks (lost packets); but I suspect this would be too slow for most purposes.
Colin Percival
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