From: Ken.Farrington@barclayscapital.com
Date: Fri Oct 03 2003 - 16:28:53 GMT-3
Friends,
can anyone explain to me in english how I would accomplish the following,
just getting way confused and need to lock this down in my head once and for
all (the actual logic) - im off to bed, as i have been up since 4am, so u
never know, i could be inspired in my dreams - hope my dreasm are a little
more exciting than that :)
I have these networks
121.10.17.0 /24
127.24.6.0 /24
122.35.35.0 /24
111.16.6.0 /24
-------------------------------------------------------------------------
Q.
Using the minimal amount of config to allow these networks thru an ACL.
-------------------------------------------------------------------------
Also, what would be the starting network and how to I get the starting
network
even when i put these in Binary, i am getting confused with the care and
dont care bits.
Lets take the first octet of each network
Care bit (indicated by the asterix)
(if there is a line with the same matching binary number, set this to to the
matched 1 or zero ie, if 0, set to zero, if 1, set to 1)
Dont Care Bit
(if there is a 0 or 1 in a line, set the bit to 1 )
*** *
121 01111001
127 01111111
122 01111010
111 01101111
Care bits total 232 or is do the care bits total 104 ?
Dont care bits total 23
Lets take the second octet of each network
Care bit (indicated by the asterix)
(if there is a line with the same matching binary number, set this to to the
matched 1 or zero ie, if 0, set to zero, if 1, set to 1)
Dont Care Bit
(if there is a 0 or 1 in a line, set the bit to 1 )
** *
10 00001010
24 00011000
35 00100011
16 00010000
Care bits total 196 or do the care bits equal 0
Dont care bits total 63
Lets take the third octet of each network
Care bit (indicated by the asterix)
(if there is a line with the same matching binary number, set this to to the
matched 1 or zero ie, if 0, set to zero, if 1, set to 1)
Dont Care Bit
(if there is a 0 or 1 in a line, set the bit to 1 )
** *
17 00010001
6 00000110
35 00100011
6 00000110
Care bits total 200 or do the care bits equal 0
Dont care bits total 55
Lets take the fouth octet of each network
Care bit (indicated by the asterix)
(if there is a line with the same matching binary number, set this to to the
matched 1 or zero ie, if 0, set to zero, if 1, set to 1)
Dont Care Bit
(if there is a 0 or 1 in a line, set the bit to 1 )
********
0 00000000
0 00000000
0 00000000
0 00000000
Does the care bit equal 255 or zero
Dont care bit is 0
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