Jeffrey E Burgoyne wrote: > > > > > I think i've been the victim of a DOS, realised with a SYN > Flood. I'm > > not sure, but if yes, that's the first time. > > Currently i try to understand what happened. I have an entry in > > error_log which hit me on that idea: > > "[Sat Apr 23 15:19:02 2011] [error] server reached > MaxClients setting, > > consider raising the MaxClients setting" > > Pretty sure a syn flood would not do that. > You are right. The linux i'm using has implmented SYN COOKIES, which is a protection against SYN FLOODS: pc51332:/opt/bioinformatics/soft/apache/logs # cat /proc/sys/net/ipv4/tcp_syncookies 1 more information: http://en.wikipedia.org/wiki/SYN_cookies http://cr.yp.to/syncookies.html Bernd Helmholtz Zentrum MÃnchen Deutsches Forschungszentrum fÃr Gesundheit und Umwelt (GmbH) IngolstÃdter Landstr. 1 85764 Neuherberg www.helmholtz-muenchen.de Aufsichtsratsvorsitzende: MinDirÂin BÃrbel Brumme-Bothe GeschÃftsfÃhrer: Prof. Dr. GÃnther Wess und Dr. Nikolaus Blum Registergericht: Amtsgericht MÃnchen HRB 6466 USt-IdNr: DE 129521671
|