Rule matchup in iptables

Rule matchup in iptables

[Javier Miguel =?unknown-8bit?q?Rodr=EDguez?=]

	Hello

	I have a iptables based firewall, with 5 gigabit ethernet
adapters and almost 8000 rules (ouch!). This is a "test bed", (still) not a
production enviroment

	I can see delays in traffic when crosses the firewall
(miliseconds). I want to optimize the firewall rules (we use a LOT of
VoIP) , so this is my question: Is there any way to know when a packet matches a rule? 
-j LOG is not feasible (thousands of packets per second). I want something like this: 

Last two hours:

Rule 1: 15000 hits, 150 megabytes
Rule 2: 3500 hits, 34 megabytes
Rule 3: 9675 hits, 2 megabytes
ad infinitum...

	Other question? How can I test iptables rules? In ipchains I
could try them, but with iptables do I have to generate fake traffic?

	Thank you for your support.

Re: Rule matchup in iptables

[Athan]

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On Thu, Mar 06, 2003 at 01:47:58PM +0100, Javier Miguel Rodr?guez wrote:
> VoIP) , so this is my question: Is there any way to know when a packet matches a rule? 
> -j LOG is not feasible (thousands of packets per second). I want something like this: 
> 
> Last two hours:
> 
> Rule 1: 15000 hits, 150 megabytes
> Rule 2: 3500 hits, 34 megabytes
> Rule 3: 9675 hits, 2 megabytes
> ad infinitum...

   iptables -nvL

The -v is the important bit here, you get 'packets' and 'bytes' counters
per rule then.  Adding -x will give exact byte numbers, rather than
summarising to K/M/G as the number grows.
  You can use -Z on a table to zero the counters when needed.

> 	Other question? How can I test iptables rules? In ipchains I
> could try them, but with iptables do I have to generate fake traffic?

  The only mention I can find of such in the man page is:

BUGS
       Check is not implemented (yet).

So I guess not.

-Ath
-- 
- Athanasius = Athanasius(at)miggy.org / http://www.miggy.org/
                  Finger athan(at)fysh.org for PGP key
	   "And it's me who is my enemy. Me who beats me up.
Me who makes the monsters. Me who strips my confidence." Paula Cole - ME

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Re: Rule matchup in iptables

[...]

try:

iptables -L -nv

and with the return you can view your consume (ammount of packets) and set
the rules in order to optimize the hits.


...
----- Original Message -----
From: "Javier Miguel Rodríguez" <javier@talika.eii.us.es>
To: <netfilter@lists.netfilter.org>
Sent: Thursday, March 06, 2003 9:47 AM
Subject: Rule matchup in iptables


>
> Hello
>
> I have a iptables based firewall, with 5 gigabit ethernet
> adapters and almost 8000 rules (ouch!). This is a "test bed", (still) not
a
> production enviroment
>
> I can see delays in traffic when crosses the firewall
> (miliseconds). I want to optimize the firewall rules (we use a LOT of
> VoIP) , so this is my question: Is there any way to know when a packet
matches a rule?
> -j LOG is not feasible (thousands of packets per second). I want something
like this:
>
> Last two hours:
>
> Rule 1: 15000 hits, 150 megabytes
> Rule 2: 3500 hits, 34 megabytes
> Rule 3: 9675 hits, 2 megabytes
> ad infinitum...
>
> Other question? How can I test iptables rules? In ipchains I
> could try them, but with iptables do I have to generate fake traffic?
>
> Thank you for your support.
>
>
>