Denial of service attacks

How can I defend a denial of service attack on my network ?
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drtoto82Asked:
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KaarthickConnect With a Mentor Commented:
Please visit this site http://www.dshield.org/ and click on the link named

" Are you cracked? Click here to see "

It will give you the ports which are currently used by the Trojans in  your system. You can deny the outbound and inbound connections to those ports using the firewall you've setup.
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chicagoanCommented:
Keeping a low profile is one way, don't advertise unneccesarily in DNS, set your firewall to reject ICMP packets, use uncommon ports for private services (i.e. webmail, popmail, ftp, etc not intended for the general public). Obfuscate your operating systems and application servers - i.e. set your IIS server to report something like "acme web server v1.0 beta" via URLscan so that bots looking to compromise an IIS installation will leave you alone. Use of a high-end firewall that can detect DOS attacks through stateful inspection can help. Use of a tar pit can slow down DOS attacks.

http://labrea.sourceforge.net/labrea-info.html
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