From: abdul muhammed (abdulmuri@gmail.com)
Date: Tue Apr 22 2008 - 06:40:40 ART
Hi GS,
I was thinking 192.0.0.0/24 ge 24 will only the any host with the first 24
bits (192.0.0) network, why will it allow 192.0.0.0 to 223.0.0.0.
I cant put the explanation together.
thanks
On 4/15/08, Johnny Phan <johnny_d_phan@hotmail.com> wrote:
>
> After thinking about it a little more, I think I might be mistaken. I was
> thinking of the "classic" sense of the word class C. If we go by the
> definition below. Then I think Scott is correct.
>
> A Class C address begins with binary 110. Therefore, the lowest number
> that can be represented is 11000000, decimal 192. The highest number that
> can be represented is 11011111, decimal 223. If an address contains a number
> in the range of 192 to 223 in the first octet, it is a Class C address.
>
> ----- Original Message ----- From: "Johnny Phan" <
> johnny_d_phan@hotmail.com>
> To: "Scott Morris" <smorris@ipexpert.com>; "'Tarun'" <tarun.ccie@gmail.com>;
> "'Athaide, Dwayne'" <DAthaide@eprod.com>
> Cc: "'groupstudy'" <ccielab@groupstudy.com>
> Sent: Tuesday, April 15, 2008 8:41 AM
> Subject: Re: Another Prefix list question
>
>
> The correct answer is 192.0.0.0/3 ge 24 le 24 because:
> >
> > 1) You ONLY want to match the networks between 192-223.
> > 2) You ONLY want to match the subnet mask of /24, no more, no less.
> > Try it out.
> >
> > ----- Original Message ----- From: "Scott Morris" <smorris@ipexpert.com>
> > To: "'Tarun'" <tarun.ccie@gmail.com>; "'Athaide, Dwayne'" <
> > DAthaide@eprod.com>
> > Cc: "'groupstudy'" <ccielab@groupstudy.com>
> > Sent: Monday, April 14, 2008 10:53 PM
> > Subject: RE: Another Prefix list question
> >
> >
> > "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
> > > Fax: +1.810.454.0130
> > > http://www.ipexpert.com
> > >
> > >
> > >
> > >
> > >
> > > -----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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>
>
-- Abdul Muhammed Murtala AMerican University of Nigeria Lamido Zubairu way, Yola Adamawa +2348052001153, +2348056201237Network Manager MCSE,MCDBA,MCSA,OCPDBA,CCNA,CCIE Written.
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