How to log icmp and DOS attack?

How to log icmp and DOS attack?

Post by Mar » Mon, 20 Jul 1998 04:00:00



I need to know the best way to log icmp and denial of service attacks
such as teardrop, bonk, and other "nuking" programs.  Thanks for any
info.

Mark

 
 
 

1. Urgent: Machine crash, someone DoS attack using ICMP..help needed

Hi,

My machine is attacking by ICMP DoS, almost everyday.

Feb 20 12:29:55 bsd /kernel: icmp-response bandwidth limit 923/200 pps
Feb 20 12:29:56 bsd /kernel: icmp-response bandwidth limit 820/200 pps

And the machine freezed, after the attack, and have to reboot it.

I have setup the IPFW to block the ICMP, but still not solving the problems.

This is my IPFW rules:

    03001 allow tcp from (my dialup IP) to any 21
    03100 deny tcp from any to any 21
    04001 allow tcp from (my dialup IP) to any 22
    04100 deny tcp from any to any 22
    09001 allow icmp from (my dialup IP) to any
    09002 allow icmp from (server IP) to any
    09003 allow icmp from 127.0.0.1 to any
    09100 deny icmp from any to any
    65534 allow ip from any to any
    65535 deny ip from any to any

Advise and sugguestions needed for the IPFW rule configuration.

And do we need the "allow ip from any to any via lo0" to be added into the Rules?

helps are appreciated.
Thnx
-Matt

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