From: Scott Morris (smorris@xxxxxxxx)
Date: Thu May 25 2000 - 17:18:15 GMT-3
You're going to take out all the fun if I GIVE you the answer. :)
Write the nets you want (a few examples) in binary, and look at the bits
that change... Then build a mask number that includes all other numbers but
the one you want, and convert it back to decimal! You know how net masks
work, this is just an application of the math logic.
Scott
-----Original Message-----
From: Robert_Wang@toyota.com [mailto:Robert_Wang@toyota.com]
Sent: Thursday, May 25, 2000 3:59 PM
To: smorris@ccci.com
Cc: ccielab@groupstudy.com
Subject: RE: supernet
So if I need to create an access list to permit only 172.16.1.0, 172.16.3.0
and
172.16.5.0/24, it will be ----
"access-list 10 permit 172.16.0.0 0.0.7.255", but it will allow the whole
172.16.0.0/21 subnet!!
Now, say my OSPF domain receives a bunch of RIP routes 192.168.1.0, 2.0,
3.0,
4.0, and 192.168.5.0 through redistribution, if I want to append a
"route-map"
to "redistribute rip" under OSPF section to only permit the even routes
192.168.2.0 and 192.168.4.0 coming into my OSPF, what will be the
access-list
and its wild card mask?
Thanks,
Robert
"Scott Morris" <smorris@ccci.com> on 05/25/2000 12:05:49 PM
Please respond to smorris@ccci.com
To: Robert Wang/Vendors/Toyota@Toyota, ccielab@groupstudy.com
cc:
Subject: RE: supernet
Judging by the bit boundaries, you'd need to go with 172.16.0.0/21, which
covers:
172.16.0.0/24
172.16.1.0/24
172.16.2.0/24
172.16.3.0/24
172.16.4.0/24
172.16.5.0/24
172.16.6.0/24
172.16.7.0/24
So if you can live with "eating" those extra subnets, that's it. Otherwise,
don't summarize.
Scott Morris, MCSE, CNE(3.x), CCDP (R&S), CCIE (R&S) #4713, Security
Specialization, CCNA - WAN Switching
CCSI #21903
smorris@ccci.com
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-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Robert_Wang@toyota.com
Sent: Thursday, May 25, 2000 2:53 PM
To: ccielab@groupstudy.com
Subject: Re: supernet
How do I create a supernet to cover 172.16.1.0/24 and 172.16.3.0/24 and
172.16.5.0/24??
-Robert-
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