From: yuen me (yuen_me@xxxxxxxxxxx)
Date: Sat Feb 16 2002 - 22:30:45 GMT-3
James,
U are right. As long as the MSB of the 3rd byte is 0, the mask is fine.
Yuenme
>From: "Xu, James" <james.xu@eds.com>
>Reply-To: "Xu, James" <james.xu@eds.com>
>To: "'Lab Candidate'" <labccie@yahoo.com>, Scott Morris <swm@emanon.com>,
> Sam.MicroGate@usa.telekom.de, ccielab@groupstudy.com
>Subject: RE: ACL question
>Date: Wed, 13 Feb 2002 18:00:59 -0500
>
>Guys:
>
>Am I missing something here?
>
>I think each of his access-list will work, even if they are not do
>precisely
>match.
>access-list 1 permit 192.168.123.0 0.0.7.255
>will permit every routes between 192.168.120.0 and 192.168.127.0, and
>implicitly deny any other routes, which includes 128, and 129.
>
>James
>
>-----Original Message-----
>From: Lab Candidate [mailto:labccie@yahoo.com]
>Sent: Wednesday, February 13, 2002 5:32 PM
>To: Scott Morris; Sam.MicroGate@usa.telekom.de; ccielab@groupstudy.com
>Subject: RE: ACL question
>
>
>I'd say access-list 1 is right, it can do what he is asking for.
>
>--- Scott Morris <swm@emanon.com> wrote:
> > F. None of the above...
> >
> > Because of bit boundaries though, you can't summarize quite so nicely.
> >
> > access-list 6 permit 192.168.123.0 0.0.0.255
> > access-list 6 permit 192.168.124.0 0.0.3.255
> >
> > That will cover 123, 124, 125, 126 and 127. The implicit deny will
>catch
> > 128 and 129....
> >
> > Hope that helps.
> >
> > Scott
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> > Sam.MicroGate@usa.telekom.de
> > Sent: Wednesday, February 13, 2002 4:02 PM
> > To: ccielab@groupstudy.com
> > Subject: ACL question
> >
> >
> > Suppose that the backbone is advertising the following routes:
> > 192.168.123.0/24
> > 192.168.124.0/24
> > 192.168.125.0/24
> > 192.168.126.0/24
> > 192.168.127.0/24
> > 192.168.128.0/24
> > 192.168.129.0/24
> > I need to filter .128 and .129 and pass every thing else. which of the
> > following access list is correct
> > access-list 1 permit 192.168.123.0 0.0.7.255 or
> > access-list 2 permit 192.168.124.0 0.0.7.255 or
> > access-list 3 permit 192.168.125.0 0.0.7.255 or
> > access-list 4 permit 192.168.126.0 0.0.7.255 or
> > access-list 5 permit 192.168.127.0 0.0.7.255
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