RE: [NTISP] Cisco netmasks
Sun, 18 Jul 1999 13:48:00 +0100


This isn't strictly speaking true. Ciscos uses the same method of subnet
masking as other people in the IP world.

What you described is a cisco wildcard, used to contruct access lists,
distribution lists and other such stuff. You can think of it as a boolean
not of the corresponding subnet mask. So if you want the wildcard that
corresponds a /26 (or depending on your personal preference)
you'd be looking at (in binary
!11111111.11111111.11111111.11000000 = = in decimal)


--ISMA Ltd, 7 Limeharbour, London E14 9NQ, United Kingdom.PGP key 1024/30F9FE07 1992/12/09 Stephen Dunne <>

-----Original Message-----From: Danny Sinang []Sent: 18 July 1999 06:21To: NTISPSubject: [NTISP] Cisco netmasks


Cisco uses netmasks which seem to be the opposite that of UNIX.

For example, in UNIX is actually .

Can anyone provide me a clear way on how I can convert UNIX netmasknotations to that of Cisco's ?

Like in particular, I would like to know what UNIX's is inCisco .


- Danny Sinang

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