Re: IP Ranges

["Fetch, Brandon" <bfetch () tpg com>]

Object groups is where I was headed.  The groups can take on networks,
hosts, ports and can then be used in place of where an ACL would go.

 

I happen to use object groups to define a block of allowed inbound
sources and use that to define the ACL as the source.

Keeps me from having to selectively manage an ACL.  The ACL stays put
and I merely mange the group.

 

HTH,

Brandon

 

________________________________

From: firewall-wizards-bounces () listserv icsalabs com
[mailto:firewall-wizards-bounces () listserv icsalabs com] On Behalf Of
Jason Gervia
Sent: Tuesday, March 27, 2007 3:48 PM
To: Firewall Wizards Security Mailing List
Subject: Re: [fw-wiz] IP Ranges

 

Hello, 

In regards to cisco PIX - there's no real way to specify a 'range'
option with regards to IP addresses.  I'd suggest trying object groups
and specifying which hosts you would like.

In IOS, you could potentially use subnet masks that specified 2,4,8,16,
etc hosts to get the equivalent of a range, but I believe the stateful
firewalling that is part of the pix won't allow that (it will deny
src/destinations of networks or broadcast networks). 

I agree, it would be a great thing for cisco to add in a later code
release.  Unfortunately it's not here yet.



--Jason

On 3/26/07, Sergio Pozo Hidalgo <sergio () lsi us es> wrote:

Hi all,
I have been searcing in the list and in google about how to specify ip
ranges in different low level firewall languages.

I have read that it is possible to do that with iptables using
--ip-range parameter. But I could'nt find any information reagarding PIX

or PF using a syntax like iptables one.
I know it is possible to specify contiguous and non-contiguous ip ranges
using subnets (Subnet Calculator is a good application for that), and a
combination of deny and permit rules. But the question is if there is a 
way to specify a range using the easy-to-use format of iptables:
192.168.0.1-192.168.2.20 (I know there is a mix of subnets...)

Thank you very much in advance.
Best regards,

--
Sergio Pozo Hidalgo 
Quivir Research Group <www.lsi.us.es/~quivir>
University of Seville (Spain)
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