On Fri, 07 Nov 2014 23:11:26 +0530, Puneet Agarwal said: > I use linux kernel 2.6. I have enabled SYN cookies already. But that does not > seem to solve the problem. Overall request latency is very high with these many > half open connections. So, out of curiosity, where are all these half open connections coming from? Are they from addresses in your local network? Outside sites that *should* be connecting? Places you've never heard and and probably *shouldn't* be connecting? (Also, if you have properly implemented syncookies, you shouldn't *have* any half-open connections. That's the whole point of syncookies....)
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