From: Scott Morris (smorris@ipexpert.com)
Date: Thu Oct 25 2007 - 14:58:53 ART
Minor problem here.... While the ranges are good for your prefix list, you
cannot use the original mask (e.g. /8, /12 or /16) in your ge/le portion.
So it would suffice to have:
10.0.0.0/8 le 32 (because you can't go below /8 based on your starting
point)
172.16.0.0/12 le 32
192.168.0.0/16 le 32
Your other examples of restricting just the /8, or /16's within the /12 or
/24's within the /16 are perfectly fine.
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
A Cisco Learning Partner - We Accept Learning Credits!
smorris@ipexpert.com
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-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Joseph Saad
Sent: Thursday, October 25, 2007 1:46 PM
To: groupstudy
Subject: Re: Re : Writing a prefix-list for .....
I'd double your second entry against RFC 1918.
3. Private Address Space
The Internet Assigned Numbers Authority (IANA) has reserved the
following three blocks of the IP address space for private internets:
10.0.0.0 - 10.255.255.255 (10/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix)
in short format, those prefixes can be represented
10.0.0.0/8 (represents a single Class A range) or
10.0.0.0/8 ge 8 le 32 (all possible entries within the range)
172.16.0.0/12 ge 16 le 16 (represents all Class B networks within the range)
or
172.16.0.0/12 ge 12 le 32 (all possible entries within the range)
192.168.0.0/16 ge 24 le 24 (represents all Class C networks within the
range)
or
192.168.0.0/16 ge 16 le 32 (all possible entries within the range)
On 10/25/07, Saul Arjona <saul.arjona.bueno@gmail.com> wrote:
>
> With regards to your question about the private address range I would
> say go ahead and memorize them it is easier and faster in case you
> need them.
> there
> are just three ranges
>
> 10.0.0.0/8
> 172.16.0.0 - 172.16.31.0 /16
> 192.168.0.0 - 192.168.255.0 /24
>
> regards,
> -Saul
>
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