From: Scott Morris (swm@emanon.com)
Date: Thu Feb 08 2007 - 12:09:01 ART
It's all a matter of breaking things into binary and finding the matches.
Kinda the reverse way of how we find bit boundaries for subnet masks.
With a number between 0 and 161, where are the bit boundaries?
0-127 is one.
128-160 is another.
Then 161 all alone (if you are including it).
The more work you do with binary, the more this will come naturally. Until
then, it's much like you do with subnet masks except that we are more
concerned with the left side than the right side. :)
HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE
#153, CISSP, et al.
CCSI/JNCI-M/JNCI-J
IPexpert VP - Curriculum Development
IPexpert Sr. Technical Instructor
smorris@ipexpert.com
http://www.ipexpert.com
-----Original Message-----
From: Deji Steve-Fagbemi [mailto:deji500@hotmail.com]
Sent: Thursday, February 08, 2007 5:18 AM
To: 'Manjeet Chawla'; 'Victor Cappuccio'
Cc: swm@emanon.com; ccielab@groupstudy.com
Subject: RE: Route Filtering using Prefix Lis
Scott, Manjeet or anyone else with a good grasp of prefix-lists,
I am struggling really hard to understand the prefix-lists proposed by
Scott.
I have a basic understanding of prefix-lists. I can match routes with a
prefix-list but I can not get the ones proposed by Scott. What if it were
all routes below 161.0.0.0/8?
Someone please help.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Manjeet Chawla
Sent: Tuesday, February 06, 2007 4:13 AM
To: Victor Cappuccio
Cc: swm@emanon.com; ccielab@groupstudy.com
Subject: Re: Route Filtering using Prefix Lis
198.0.0.0/8 is probably not the right answer as it only covers the
"198.0.0.0 - 198.255.255.255"
whereas the question (as I read it) is asking for "0.0.0.0 -
197.255.255.255" range as reflecting in Scott's reply.
-Manjeet
Victor Cappuccio wrote:
> Hi Manjeet
>
> He made it sound like 0-197 in what he was asking
>
> >
> > Any idea hwo we can have route only from 1-197 as the first Octet.
> >
>
> But
>
> >
> > I have a situation where i have to allow all prefixes below
> 198.0.0.0/8 <http://198.0.0.0/8>.
> >
>
> So the question was for the first one or the second one? So Scott
> answered it the Second one and I answered the first one
>
> Thanks
>
> Victor.-
>
>
> On 2/5/07, *secondie* <secondie@gmail.com <mailto:secondie@gmail.com>>
> wrote:
>
> Victor, I think allows all 198.0.0.0/8 <http://198.0.0.0/8> LE 32
> allows only 198.0.0.0 <http://198.0.0.0> -
> 198.255.255.255 <http://198.255.255.255> and LE 32 allows any
> subnet mask in the range mentioned.
>
> Ahmed wants all the subnet from 1-197 in the first octet to be
> permitted
> through :-)
>
> -Manjeet
> CCIE # 5591 (R&S/Security)
>
>
>
>
>
> Victor Cappuccio wrote:
> > Hi Scott,
> >
> > What about this prefix-list
> >
> > permit 198.0.0.0/8 <http://198.0.0.0/8> le 32
> >
> > Thanks
> > Victor.-
> >
> > -----Mensaje original-----
> > De: nobody@groupstudy.com <mailto:nobody@groupstudy.com> en
> nombre de Scott Morris
> > Enviado el: lun 05/02/2007 13:12
> > Para: Ahmed Mohiuddin; ccielab@groupstudy.com
> <mailto:ccielab@groupstudy.com>
> > Asunto: RE: Route Filtering using Prefix List
> >
> > 0.0.0.0/1 <http://0.0.0.0/1> le 32
> > 128.0.0.0/2 <http://128.0.0.0/2> le 32
> > 192.0.0.0/6 <http://192.0.0.0/6> le 32
> > 196.0.0.0/7 <http://196.0.0.0/7> le 32
> >
> > HTH,
> >
> >
> > Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider)
> #4713, JNCIE
> > #153, CISSP, et al.
> > CCSI/JNCI-M/JNCI-J
> > IPexpert VP - Curriculum Development
> > IPexpert Sr. Technical Instructor
> > smorris@ipexpert.com <mailto:smorris@ipexpert.com>
> > http://www.ipexpert.com
> >
> >
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com <mailto:nobody@groupstudy.com>
> [mailto:nobody@groupstudy.com <mailto:nobody@groupstudy.com>] On
> Behalf Of
> > Ahmed Mohiuddin
> > Sent: Sunday, February 04, 2007 11:45 PM
> > To: ccielab@groupstudy.com <mailto:ccielab@groupstudy.com>
> > Subject: Route Filtering using Prefix List
> >
> > Hi All,
> >
> > I have a situation where i have to allow all prefixes below
> 198.0.0.0/8 <http://198.0.0.0/8>.
> >
> > I am trying to use prefix list to accomplish this but does nto
> seem to help.
> >
> > Any idea hwo we can have route only from 1-197 as the first Octet.
> >
> > Thanks
> > Ahmed
> >
> >
> >
> >
>
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