icmp problem

Brad Knowles brad.knowles at skynet.be
Wed Mar 14 13:49:29 UTC 2001

At 8:47 AM -0500 3/14/01, Tom Nichols wrote:

>  We turn off almost all UDP services to prevent our systems from
>  responding to UDP floods. Works great.

	Well, by default the DNS is a UDP protocol, so unless you want to 
end up generating your own ICMP storms in response to DNS queries, 
you might just want to rethink that particular idea.

Brad Knowles, <brad.knowles at skynet.be>

#!/usr/bin/perl -w
# 531-byte qrpff-fast, Keith Winstein and Marc Horowitz <sipb-iap-dvd at mit.edu>
# MPEG 2 PS VOB file on stdin -> descrambled output on stdout
# arguments: title key bytes in least to most-significant order
# Usage:
# qrpff 153 2 8 105 225 /mnt/dvd/VOB_FILE_NAME | extract_mpeg2 | mpeg2_dec -
$m=(11,10,116,100,11,122,20,100)[$_/16%8])&110;$t^=(72, at z=(64,72,$a^=12*($_%16
-2?0:$m&17)),$b^=$_%64?12:0, at z)[$_%8]}(16..271);if((@a=unx"C*",$_)[20]&48){$h
=5;$_=unxb24,join"", at b=map{xB8,unxb8,chr($_^$a[--$h+84])}@ARGV;s/...$/1$&/;$
(($h>>=8)+=$f+(~$g&$t))for at a[128..$#a]}print+x"C*", at a}';s/x/pack+/g;eval

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