RE: [Iptablelog-users] Using Memoize to speed up DNS

[Michael B. <Mic...@In...>]

How did your test work out?=20

Thanks,
Michael=20

-----Original Message-----
From: sgdailey [mailto:sgd...@ro...]=20
Sent: Wednesday, December 29, 2004 6:30 PM
To: ipt...@li...
Subject: [Iptablelog-users] Using Memoize to speed up DNS

Thanks to Michael Brown for pointing me in the right direction on the
delay
I was experiencing in the web page updates. I have modified feed_db.pl a
little bit to use memoize to speed up name lookups. Memoize is a Perl
module
and can be downloaded here.
http://perl.plover.com/Memoize/Memoize-1.01.tar.gz
Memoize will cache results of a function, next time that function is
called
it will see if the arguments already have a cached result and if so will
simply use the cached results instead of calling the function again.
Here
are the changes I made to feed_db.pl

line 30 or so looks like this:

use Socket;

just add these next three lines under that line:

use Memoize;
memoize 'mygethostbyaddr';
sub mygethostbyaddr { gethostbyaddr(@_) };

I haven't tested it extensively yet but I'm hoping it wont continuously
look
up a host that has probed a thousand ports. I am about to flood the log
and
see how it handles it. I will post results.

Thanks again to Michael Brown

sgdailey



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