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Comments, Suggestions & Questions / Re: OS2World - running a little slow for anyone else?
« Last post by Kim on Today at 12:39:58 am »Just to let you know. These days we also had been hit by some DDoS attacks.
We are also checking what else can we do.
Well, the issue that we have had has been ddos for quite a while and ongoing for several month back and forth and just recently we've been dealing with a lot of SYN flooding and as well recently with massive amount of HTTP flooding as well once we cut of the SYN flooding. So having 2k - 5k users online on the forum was really to slow the server and then dump in loads of SYN ack requests... does the trick.
Code: [Select]
netstat -s | grep -i syn
202740 SYN cookies sent
433510 SYN cookies received
262994 invalid SYN cookies received
228178 resets received for embryonic SYN_RECV sockets
53117722 SYNs to LISTEN sockets dropped
TCPSYNChallenge: 172
TCPSynRetrans: 3398945
TCPACKSkippedSynRecv: 4699
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