Cisco ASA DDoS protection

network

Cisco ASA DDoS protection
Have already tried this on a cisco ASA 5510. Obviously this is a very limit and temp solution. If you need a comprehensive DDoS protection solution, plz use cisco Guard

This one basically can limit connecion numbers based on per client IP address. For instance you can specify every individual Client IP address can only have x number of concurrent connections and x number of embryonic connections

Configuration Example

STEP1: Identify the traffic to apply connection limits using a class map
ASA(config)# access list CONNS-ACL extended permit ip any 10.1.1.1 255.255.255.255
ASA(config)# class-map CONNS-MAP
ASA(config-cmap)# match access-list CONNS-ACL

STEP2: Add a policy map to set the actions to take on the class map traffic
ASA(config)# policy-map CONNS-POLICY
ASA(config-pmap)# class CONNS-MAP
! The following sets connection number limits
ASA(config-pmap-c)# set connection {[conn-max n] [embryonic-conn-max n]
[per-client-embryonic-max n] [per-client-max n] [random-sequence-number {enable | disable}]}

where the conn-max n argument sets the maximum number of simultaneous TCP and/or UDP connections that are allowed, between 0 and 65535.

The embryonic-conn-max n argument sets the maximum number of simultaneous embryonic connections allowed, between 0 and 65535.

The per-client-embryonic-max n argument sets the maximum number of simultaneous embryonic connections allowed per client, between 0 and 65535.

The per-client-max n argument sets the maximum number of simultaneous connections allowed per client, between 0 and 65535.

! The following sets connection timeouts
ASA(config-pmap-c)# set connection timeout {[embryonic hh:mm:ss] {tcp hh:mm:ss
[reset]] [half-closed hh:mm:ss] [dcd hh:mm:ss [max_retries]]}

STEP3: Apply the Policy on one or more interfaces or Globaly

ASA(config)# service-policy CONNS-POLICY {global | interface interface_name}