From: dusth@comcast.net
Date: Fri Sep 03 2004 - 16:34:02 GMT-3
Thanks.
-------------- Original message --------------
> Dustin,
>
> They are not the same, it just binary math:
>
> Solution book
> Line 1: access-list 51 deny 239.0.0.0 0.255.255.255
> => Result: Will block 239
> Line 2: access-list 51 deny 224.0.0.0 1.255.255.255
> => Result: Will block 224 and 225
> Line 3: access-list 51 permit 224.0.0.0 15.255.255.255
> => Result: Will pass 224,225,226,...,238 and 239
>
> Result of acl51:
> Will pass 226,227,228,...,237 and 238
>
> Your solution: access-list 51 permit 226.0.0.0 12.255.255.255
> => will only pass 226,230,234 and 238
>
> Your solution will not pass 227,228,229,231,232,233,235,236,237
> This is why they are not the same.
>
> HTH
> Kristof.
>
> > Hi all,
> > I have a question on multicast acl. Could any one explain for me
> differences b/t these 2 acl.
> > Solution book:
> > access-list 51deny 239.0.0.0 0.255.255.255
> > access-list 51 deny 224.0.0.0 1.255.255.255
> > access-list 51 permit 224.0.0.0 15.255.255.255
> > Can I use as follow acl configuration instead? If no, then why can't
> I? Though 224, 225, and 239 subnet will be implicitly deny, or because
> this acl is multicast acl so have to be configure the deny statement.
> > access-list 51 permit 226.0.0.0 12.255.255.255
> >
> > Thanks in advance
> > Dustin
> >
> >
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