Re: PERMITING ODD\EVEN PREFIXES

Not derived a formula , but i know a logic.

Firstly 1 is an odd number ,

Secondly 256-254=2 , adding 1 to any multiple of 2 will always give an
odd number

Hence it matches any odd network and subnets of that network(due to
the .255.255.255 )

To match only odd networks with no subnets you can use

1.0.0.0 254.0.0.0

HTH

On 3/23/10, Tannie Philly <tanniephilly_at_gmail.com> wrote:
> Hi all,
>
> Please I need someone to help me out in explaining how to derive odd\even
> prefixes (wildcards).
>
> Forinstance,
> ip aceess-list standard ODD_FIRST_OCTET
> permit 1.0.0.0 254.255.255.255
>
> Is there a formular for arriving at this wildcard?
>
> Please I need assistance here.
>
> Tannie
>
>
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