DDOS attack please help!


 
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Homework and Emergencies Emergency UNIX and Linux Support DDOS attack please help!
# 8  
Old 01-06-2015
Is it a SYN flood attatack?

I found net.ipv4.tcp_syncookies helped for my servers, and I would use
ip route add blackhole x.x.x.x

and in our case the attacker would get bored.

Not too clever but OK as a quick emergency fix.
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install::TempContent::Objects::mod_perl-2.0.9::docs::apiUseraContributed)install::TempContent::Objects::mod_perl-2.0.9::docs::api::Apache2::MPM(3)

NAME
Apache2::MPM - Perl API for accessing Apache MPM information Synopsis use Apache2::MPM (); # check whether Apache MPM is threaded if (Apache2::MPM->is_threaded) { do_something() } # which mpm is used my $mpm = lc Apache2::MPM->show; # query mpm properties use Apache2::Const -compile => qw(:mpmq); if (Apache2::MPM->query(Apache2::Const::MPMQ_STATIC)) { ... } Description "Apache2::MPM" provides the Perl API for accessing Apache MPM information. API
"Apache2::MPM" provides the following functions and/or methods: "query" Query various attributes of the MPM my $query = Apache2::MPM->query($const); obj: $class ( "Apache2::MPM class" ) the class name arg1: $const ( "Apache2::Const :mpmq group constant" ) The MPM attribute to query. ret: $query ( boolean ) the result of the query since: 2.0.00 For example to test whether the mpm is static: use Apache2::Const -compile => qw(MPMQ_STATIC); if (Apache2::MPM->query(Apache2::Const::MPMQ_STATIC)) { ... } "is_threaded" Check whether the running Apache MPM is threaded. my $is_threaded = Apache2::MPM->is_threaded; obj: $class ( "Apache2::MPM class" ) the class name ret: $is_threaded ( boolean ) threaded or not since: 2.0.00 Note that this functionality is just a shortcut for: use Apache2::Const -compile => qw(MPMQ_IS_THREADED); my $is_threaded = Apache2::MPM->query(Apache2::Const::MPMQ_IS_THREADED); "show" What mpm is used my $mpm = Apache2::MPM->show(); obj: $class ( "Apache2::MPM class" ) the class name ret: $mpm ( string ) the name of the MPM. e.g., "Prefork". since: 2.0.00 See Also mod_perl 2.0 documentation. Copyright mod_perl 2.0 and its core modules are copyrighted under The Apache Software License, Version 2.0. Authors The mod_perl development team and numerous contributors. perl v5.18.2 2015-install::TempContent::Objects::mod_perl-2.0.9::docs::api::Apache2::MPM(3)