From: syed hafiz (mail4hafiz@gmail.com)
Date: Sat Aug 30 2008 - 19:11:27 ART
Thanks a lot fahad and all
tht made things clear now.....
keep up the gud work guys
On 8/31/08, Fahad Khan <fahad.khan@gmail.com> wrote:
>
> For same number of inputs,output is the same in case of XOR.
>
> On 8/31/08, syed hafiz <mail4hafiz@gmail.com> wrote:
>>
>> Thanks for tht reply anant tht solved my issue ,
>> but continuing to tht question y have u made the last octet of the wild
>> card mask '0'
>> as i was stuck abt tht. is tht includes for XOR operation as well
>>
>> thanks
>> ashhy
>>
>>
>>
>> On 8/30/08, Fahad Khan <fahad.khan@gmail.com> wrote:
>>>
>>> The actual game is of 3rd octat in this case.
>>>
>>> starting IP = x.x.4.0
>>> ending IP = x.x.15.0
>>>
>>> Four most significant bits are common in the 3rd octat i.e 0000
>>>
>>> so we have 0100 (4) and 1111(15) for our play
>>>
>>> now for calculating IP in accesslist,
>>>
>>> perform AND operation in between, 0100 and 1111
>>>
>>> 0100
>>> 1111
>>> -------
>>> 0100 = 4
>>> -------
>>> Hence, the IP is decided now as x.x.4.0
>>>
>>> Now for calculation of wildcard mask, perform XOR operation
>>>
>>> 0100
>>> 1111
>>> -------
>>> 1011 = 11
>>> -------
>>>
>>> Rules for XOR:
>>>
>>> - For same number of inputs output is 0 otherwise 1
>>> - For even number of 1s output is 0 while for odd number of 1s output is
>>> 1.
>>>
>>> hense you get the ACL as:
>>>
>>> permit x.x.4.0 0.0.11.0
>>>
>>>
>>> HTH
>>> On 8/30/08, ashhy <mail4hafiz@gmail.com> wrote:
>>>>
>>>> Hi all
>>>> i want to know how to get this right acl for the below mentioned
>>>> question
>>>>
>>>> i can use only one acl to do this ,i am getting 16 routes of class c
>>>> from xxx.xxx.1.0 to xxx.xxx.16.0
>>>> from backbone out of which i should allow only
>>>>
>>>> xxx.xxx.4.0
>>>> xxx.xxx.5.0
>>>> xxx.xxx.6.0
>>>> xxx.xxx.7.0
>>>> xxx.xxx.12.0
>>>> xxx.xxx.13.0
>>>> xxx.xxx.14.0
>>>> xxx.xxx.15.0
>>>>
>>>> please guide me or else suggest if this is already disscussed.
>>>>
>>>> Thanks
>>>> Asshy
>>>>
>>>>
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>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>> --
>>> Fahad Khan
>>
>>
>>
>
>
> --
> Fahad Khan
Blogs and organic groups at http://www.ccie.net
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