RE: ACL question

Hi Joe,

I think it wont be possible to match .13 and .14 with only one permit list.
If you configure permit 172.168.13.0 0.0.2.0, you will match .13 and .15, but not .14.

-----Mensaje original-----
De: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] En nombre de Joe Astorino
Enviado el: lunes, 08 de junio de 2009 18:33
Para: 'Bobby Kimble'; 'Cisco certification'
Asunto: RE: ACL question

Hey Bobby,

First, write out the numbers in binary, check it out:

13 1101
14 1110
        -------
        0010

So a 0 means "It MUST be..." and a 1 means "I don't care" right? So in this
case the only bit of difference is the "2" bit...so

Permit 172.168.13.0 0.0.2.0 <------ this should do you!

Regards,

Joe Astorino
CCIE #24347 (R&S)
Sr. Support Engineer - IPexpert, Inc.
URL: http://www.IPexpert.com

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
Bobby Kimble
Sent: Monday, June 08, 2009 12:19 PM
To: Cisco certification
Subject: ACL question

Hello All,
I have the following question:

Say I have a router that is receiving the following addresses via rip:

 172.168.15.0/24
.172.168.14.0/24
 172.168.13.0/24
 172.168.12.0/24

If I only want to receive .12 and .13 I would use the following acl:

permit 172.168.12.0 0.0.1.0

What would I use if I only want to receive .13 and .14?

I tried 172.168.13.0 0.0.1.0 , but I am still only receiving .12 and .13.
Where am I going wrong?

-Bobby

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Received on Mon Jun 08 2009 - 18:41:05 ART