acl types

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Sep 29th, 2008
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Hi all, when configuring access lists, what is the definition of an extended access list, I thought on a router it means source and dest, but when I configure an access list on my asa firewall, does it have a different meaning ?

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Marwan ALshawi Mon, 09/29/2008 - 01:07
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extended ACL and standard ACL work the same on the router and ASA

so the same idea exactly


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satish_zanjurne Mon, 09/29/2008 - 01:08
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Extended Access-List :


1.Extended ACLs were introduced in Cisco IOS Software Release 8.3.n all software releases, the access-list-number can be 101 to 199. In Cisco IOS Software Release 12.0.1, extended ACLs begin to use additional numbers (2000 to 2699)


***Extended ACLs control traffic by the comparison of the source and destination addresses of the IP packets to the addresses configured in the ACL.


2.In extended access-lists with ICMP you can use ICMP type, tos etc.


3.In Extended acces-list with TCP & UDP , you can use source & destination ports , in addition to source 7 destination address.


4.Also in IP Extended access-list you can use different protocols like ftp,www,telnet to match.


5.In ASA firewall , access-list are used to control the access , in both directions.


6.there are some default rules in ASA like access from higher security level to lower security level is allowed by default , unless restricted using access list, & is blocked by default from low security level to high, unless allowed using access list.


HTH...rate if helpful...

carl_townshend Mon, 09/29/2008 - 06:33
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Hi there, so how about in my cisco ASA? it lets me create acl's without the extended keyword but gives me the same features as an extended acl, is this correct ?

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