From: Venkatesh Palani (kvpalani@gmail.com)
Date: Thu Dec 22 2005 - 23:27:31 GMT-3
sorry I just realized there is a TYPO
vlaue for 30 is 16+8+4+2 and not 16+4+2.
ThanX
On 12/23/05, Venkatesh Palani <kvpalani@gmail.com> wrote:
>
>
> Hi All,
>
> Thanks Scott, I personllay dont use binary rather I use Decimal.
>
> below is the technique
>
> for instance lets take the same example from IE
>
> 10.20.30.40
> 40.30.20.10
>
> to find a access list for these address with overlapping networks I wld
> write the aboves address as shown below
>
> [8+2].[16+4].[16+4+2].[32+8]
> [32+8].[16+4+2].[16+4].[8+2]
>
> and the common vlaues in two colums shld represent the network address
> and the remaining shld fall back as wild cad mask
>
>
> in this case it will be
>
> 8.[16+4].[16+4].[8] = 8.20.20.8
>
> and the wild card mask is the sum of the left overs(the vlaues that were
> not used in the network address) in each octects from all the rows(in this
> case only two rows)
>
> [32+2].[8+2].[8+2].[32+2] = 34.10.10.34
>
>
> This shld work for any no of rows , this works better for me rather than
> those AND and XOR operations. Any comments are welcome.
>
>
> Thanx,
>
> Venkatesh
>
>
> On 12/23/05, Scott Morris <swm@emanon.com> wrote:
> >
> > From: http://en.wikipedia.org/wiki/Xor
> >
> > The case of a three, or more, input XOR operation tends to be an
> > ill-considered case. An XOR operation with three simultaneous inputs is
> > not
> > so easily expressed in most popular programming languages. When
> > expressed as
> > successive binary operations the result is a simple parity, giving a
> > TRUE
> > result for any odd number of TRUE inputs.
> > three ones XORed simultaneously
> >
> > When taken as a multi-input black box whose operation follows the formal
> >
> > definition and yields the result TRUE when one, and only one, of its
> > inputs
> > is TRUE, the behaviour is inconsistent with the successive binary mode.
> > For
> > example; in the case where three inputs are all TRUE (as shown on the
> > right,
> > in the IEC symbology to emphasise the definition) the result would have
> > to
> > be FALSE because it does not meet the condition that "only one of its
> > inputs
> > is TRUE".
> > [edit]
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto: nobody@groupstudy.com] On Behalf Of
> > Farrukh Haroon
> > Sent: Thursday, December 22, 2005 3:54 PM
> > To: Khurana, Sameer
> > Cc: Emil Patel; Nawaz, Ajaz; nenad pudar;
> > bmcgahan@internetworkexpert.com;
> > ccielab@groupstudy.com
> > Subject: Re: Question for Brian McGahan and others
> >
> > what happened to the definition of XOR I learnt in college....
> >
> > Odd Number of 1's in input Results in Output of 1, Output = 0
> > otherwise...
> >
> > ??
> >
> > On 12/22/05, Khurana, Sameer < SKHURANA@amfam.com> wrote:
> > >
> > > I think you meant by column ;)
> > >
> > > Concept remains the same if its 4 rows, 5 rows or 10 rows.
> > >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com [mailto: nobody@groupstudy.com] On Behalf
> > > Of Emil Patel
> > > Sent: Thursday, December 22, 2005 11:37 AM
> > > To: 'Nawaz, Ajaz'; 'nenad pudar'; bmcgahan@internetworkexpert.com ;
> > > ccielab@groupstudy.com
> > > Subject: RE: Question for Brian McGahan and others
> > >
> > >
> > > If the row is dissimilar the end result is 1.
> > >
> > >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com [mailto: nobody@groupstudy.com] On Behalf
> > > Of Nawaz, Ajaz
> > > Sent: Thursday, December 22, 2005 11:05 AM
> > > To: 'Emil Patel'; 'nenad pudar'; bmcgahan@internetworkexpert.com;
> > > ccielab@groupstudy.com
> > > Subject: RE: Question for Brian McGahan and others
> > >
> > > What happens when you increase the #vertical rows and apply various
> > > combinations of 1's and 0's.
> > >
> > > Let's try 5rows?
> > >
> > > Tia
> > > Ajaz Nawaz
> > >
> > >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com [mailto: nobody@groupstudy.com ] On Behalf
> > > Of Emil Patel
> > > Sent: 22 December 2005 17:07
> > > To: 'nenad pudar'; bmcgahan@internetworkexpert.com;
> > > ccielab@groupstudy.com
> > > Subject: RE: Question for Brian McGahan and others
> > >
> > > In XOR , if bit in a column is dissimilar result is 1. You do not add
> > > bit row by row.
> > >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> > > Of Emil Patel
> > > Sent: Thursday, December 22, 2005 10:49 AM
> > > To: 'nenad pudar'; bmcgahan@internetworkexpert.com;
> > > ccielab@groupstudy.com
> > > Subject: RE: Question for Brian McGahan and others
> > >
> > > 128 64 32 16 8 4 2 1
> > >
> > > 0 0 0 0 0 0 0 0
> > > 0 0 0 0 0 1 0 0
> > > 0 0 1 0 0 0 0 0
> > > 0 0 1 0 0 1 0 0
> > > ___________________________________________
> > > 0 0 1 0 0 1 0 0 = 36
> > >
> > > All vertical bits are checked XOR and if they are:
> > > (0+0)=0
> > > (0+1)=1
> > > (1+1)=0
> > > (1+0)=1
> > >
> > >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com [mailto: nobody@groupstudy.com] On Behalf
> > > Of nenad pudar
> > > Sent: Wednesday, December 21, 2005 7:57 PM
> > > To: bmcgahan@internetworkexpert.com; ccielab@groupstudy.com
> > > Subject: Question for Brian McGahan and others
> > >
> > > Hi Brian
> > > I have the question regarding your paper on Computing Access-List and
> > > Wildcard Pairs
> > >
> > > There you have
> > >
> > > 00000000
> > > 00000100
> > > 00100000
> > > 00100100
> > > _________
> > > XOR
> > > 00100100=36****
> > >
> > > I cannot get this trying in any way (for third column)
> > >
> > > 1) (((0 XOR 0) XOR 1) XOR 1)= ((0 XOR 1) XOR 1)= 1 XOR 1 =0
> > >
> > > 2) (0 XOR 0) XOR (1 XOR 1) = 0 XOR 0 = 0
> > >
> > > I am doing something wrong or there is some other trick here ?
> > >
> > >
> > > thanks
> > > nenad
> > >
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