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Re: Filtering private ip address posted 10/05/2004
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The correct ACL mask for that network is 0.15.255.255, n'est-ce pas?


Scott Morris wrote:


If you use a 0.31.255.255 mask, you are going to block everything from .0
through .31 in the B's range.  You may want to re-think your binary there!


Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, CISSP, JNCIP, et al. IPExpert CCIE Program Manager IPExpert Sr. Technical Instructor swm@xxxxxxxxxx/smorris@xxxxxxxxxxxx http://www.ipexpert.net



-----Original Message-----
From: nobody@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx] On Behalf Of
Matthew Seppeler
Sent: Tuesday, October 05, 2004 9:29 AM
To: zou wei; ccielab@xxxxxxxxxxxxxx
Subject: RE: Filtering private ip address

Here you go.

access-list 1 deny 10.0.0.0 0.255.255.255 access-list 1 deny 172.0.0.0
0.31.255.255 access-list 1 deny 192.168.0.0 0.0.255.255 access-list 1 permit
any

Any fewer lines than this in trying to merge these network addresses into
one or two statements will end up excluding more networks than you intend to
filter.

Matt Seppeler
InterNetwork Experts
Email:  mseppeler@xxxxxxxxx


-----Original Message----- From: zou wei [mailto:zwzq@xxxxxxxxxxx] Sent: Tuesday, October 05, 2004 2:48 AM To: ccielab@xxxxxxxxxxxxxx Subject: Filtering private ip address

Hi:

Could anyone tell me how to filter private addresses using the least
commands?

10.0.0.0 - 10.255.255.255 172.16.0.0 - 172.31.255.255 192.168.0.0 - 192.168.255.255

Thanks

Wei

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