From: Tarun (tarun.ccie@gmail.com)
Date: Tue Apr 15 2008 - 04:01:03 ART
Yeah, you are absolutely correct.
I think I lost my words there :)
ge 24 would match subnet lengths from 24 to 32 which is the tru class C
range.
While le 32 would match any supernetted class C address as well.
Again, I think I intended to say that but missed my words. Happens to me all
the time :(
Thanks for the correction though.
On 4/15/08, Scott Morris <smorris@ipexpert.com> wrote:
>
> "ge 24" will permit subnetted Class C addresses as well, won't it? :)
>
> On the other hand, the "le 32" will also permit SUPERnetted addresses in
> that range. Just depends on what you are looking for.
>
> HTH,
>
>
> Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713,
> JNCIE-M
> #153, JNCIS-ER, CISSP, et al.
> CCSI/JNCI-M/JNCI-ER
> VP - Technical Training - IPexpert, Inc.
> IPexpert Sr. Technical Instructor
>
> smorris@ipexpert.com
>
>
>
> Telephone: +1.810.326.1444
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>
>
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Tarun
> Sent: Tuesday, April 15, 2008 1:40 AM
> To: Athaide, Dwayne
> Cc: groupstudy
> Subject: Re: Another Prefix list question
>
> That prefix 192.0.0.0/3 ge 24 means the following.
>
> 1) It will match only the first 3 bits of the IP '192.0.0.0' which means
> any
> class C address because class C addresses are characterized by a '110' in
> the beginning of there 1st octet.
>
> 2) The 'ge 24' part means that the subnets mask of the class C address
> just
> matches has to be either equal to or greater than 24, i.e it will not
> match
> 192.168.2.3/16 for example.
>
> If you want to permit all "Class C networks" then the prefix list ideally
> should be
>
> ip prefix CLASS_C_NETWORKS permit/deny 192.0.0.0/3 le 32 - this would
> include all subnetted class C addresses as well.
>
> This is a good link on prefix lists:
> http://ccienotes.blogspot.com/2007/08/ip-prefix-list.html
>
> On 4/15/08, Athaide, Dwayne <DAthaide@eprod.com> wrote:
>
> > Please check
> >
> > If I want to permit only Class C networks
> >
> >
> >
> > Is this correct?
> >
> >
> >
> > 192.0.0.0/3 ge 24
> >
> >
> >
> > Thanks
> >
> >
> > Pass the CCIE in six weeks, Guaranteed!
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>
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