x.x.x.1 0.0.0.230 answer would be correct for the PIX firewall (they use
reverse wildcard mask - match 1, do_not_care 0)
but in router case should not this be x.x.x.1 0.0.0.24?
if we put this in binary: (forget about first three bytes )
8 7 6 5 4 3 2 1
1 - 0 0 0 0 0 0 0 1
9 - 0 0 0 0 1 0 0 1
17 - 0 0 0 1 0 0 0 1
25 - 0 0 0 1 1 0 0 1
it gives us the following - we want 1 in the position 1. 0's in 8,7,6,3,2
and do_not_care in 5 and 4. For the access- lists on Cisco routers 0 is
match, 1 is do_not_care so wildcard mask should be
0 0 0 1 1 0 0 0 which gives us 24
x.x.x.1 0.0.0.24 sutisfies this condition
RGRDS,
Evgeny
--
***********
Please DO NOT send replyes just directly to me, post them to the Newsgroup
as well
***********
""Nigel Taylor"" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Well, in light of everyone jumping in there I taught I might do the same.
> Here what fell out of this simple mind.
>
> access-list xx permit x.x.x.1 0.0.0.230 - ask me how I got this?
>
> Man, I was thinking now I'm all screwed up... I can't wait to see the
> answer, could my answer be right...
>
> Chuck/Mike "free the rest of us" please...
>
> Nigel.
>
>
> ----- Original Message -----
> From: Chuck Larrieu <[EMAIL PROTECTED]>
> To: John Neiberger <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
> Sent: Tuesday, July 04, 2000 5:29 AM
> Subject: RE: Wild Card Mask Puzzle - fun in the sun
>
>
> > I'm not human tonight.
> >
> > A paraphrase from Marlowe's soliloquy in The Little Sister, by Raymond
> > Chandler.
> >
> > This, by the way, is why it takes me so damn long to master these Cisco
> > things. I keep getting distracted by my liberal arts educational
> background.
> >
> > Chuck
> >
> > PS and I am not commenting on right or wrong because 1) let's see some
> more
> > response and 2) it's not my puzzle anyway. Mike otta get the credit and
> have
> > the fun of judging. :->
> >
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
> John
> > Neiberger
> > Sent: Monday, July 03, 2000 8:59 PM
> > To: [EMAIL PROTECTED]
> > Subject: Re: Wild Card Mask Puzzle - fun in the sun
> >
> > Ok, I'll bite. My official guess is:
> >
> > access-list xx permit ip x.x.x.1 0.0.0.24
> >
> > If I'm correct, I'll post how I did it later...right now I'm still
> > wondering... :-)
> >
> > Chuck, you're mean...just plain mean!
> >
> > Good luck all!
> >
> > John Neiberger
> >
> > >
> > >
> > > Come on, everyone. Where are you folks on this one? All you CCNA
> > candidates.
> > > Show us your stuff. All you ACRC students - give it a try. I can't
> > believe
> > > we haven't had a go round about this one.
> > >
> > > For the record, I have already filed my answer privately. It is a fun
> > > puzzle, and one that will demonstrate your thinking skills.
> > >
> > > Who knows the answer? How do you know you're right????
> > >
> > > Chuck
> > >
> > >
> > > Puzzle posed by Mike Williams:
> > >
> > > Make a (single line) access-list that will only allow traffic from
> > addresses
> > > matching the following model:
> > >
> > > x.x.x.1
> > > x.x.x.9
> > > x.x.x.17
> > > x.x.x.25
> > >
> > > It's along the same lines as the question you posed, but a little
more
> > > challenging since you only want those 4 addresses to pass
through.....
> > =)
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf
Of
> > > Michael L. Williams
> > > Sent: Wednesday, June 28, 2000 7:27 PM
> > > To: [EMAIL PROTECTED]
> > > Subject: Re: ACL Question
> > >
> > > My newsgroup reader "claims" to have posted my response to this when
it
> > was
> > > first asked. And for the record, I did have the correct answer and
> > > explanation too =P. So instead of posting yet another explanation on
> how
> > to
> > > filter odd/even IP addresses, I'll post a similar but different
> question:
> > >
> > > Make a (single line) access-list that will only allow traffic from
> > addresses
> > > matching the following model:
> > >
> > > x.x.x.1
> > > x.x.x.9
> > > x.x.x.17
> > > x.x.x.25
> > >
> > > It's along the same lines as the question you posed, but a little
more
> > > challenging since you only want those 4 addresses to pass
through.....
> > =)
> > >
> > > If you want the answer without me posting it to the whole group (to
> keep
> > > things fun), feel free to e-mail me and I'll reply via e-mail with
the
> > > answer.
> > >
> > > Mike W.
> > >
> > >
> > > "Raymond Everson (Rainman)" <[EMAIL PROTECTED]> wrote in message
> > > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > > > *Still* haven't figured this one out:
> > > >
> > > > Create an IP ACL, in as few lines as possible of course, which
> permits
> > > > only even-numbered IP addresses.
> > > >
> > > > Ideas?
> > > >
> > > > Rainman
> > > >
> > > > ___________________________________
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