[c-nsp] ACL wildcard bits

[Arturo Servin]

Take the normal mask, for example 255.255.255.0, then convert it to binary:

11111111.11111111.11111111.00000000

   The change 1 by 0, and 0 by 1s.

00000000.00000000.00000000.11111111

   then change again to decimal. The wildmask will be:

0.0.0.255

   If you use VSLM (variable subnet length mask) or CIDR it become more 
interestig. Supose you have a class C in 4 parts. You will use as mask 
255.255.255.192, in decimal it will be:

11111111.11111111.11111111.11000000

   So, you change you to wildmask:

00000000.00000000.00000000.00111111

   that in decimal it will be:

0.0.0.63

   Hope it helps.

-as


Hitesh Vinzoda wrote:

>Dear Friends ,
>
>During Accesslist configuration....
>i encountered the source wildcard bits can neone tell me wats this and how 
>to utilize this thing.
>
>thanks in advance
>
>HORouter(config)#access-list 108 permit tcp 172.16.3.24 ?
>  A.B.C.D  Source wildcard bits
>
>_________________________________________________________________
>Kareena or Rani? Saif or SRK? http://server1.msn.co.in/sp05/iifa/ Rock your 
>vote now at IIFA.
>
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