Access Control lists

[Shannuhov]

Hello,

I have a cisco 1900 router, that has a current Extended ACL named Internet. 

I have created a named ACL and added the variables I need for my new email server but have not applied it to the interface yet.

My question is, if I apply this new named ACL to the interface, will my old ACL that I still need to work, stop working or can I have both named ACL's 

working at the same time?

Thanks,

Stephen 

[Joseph W. Doherty]

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Posting

You many only have one IP ACL, for ingress or egress.

[Shannuhov]

So Its either the DMZ ACL or the INTERNET ACL, not both...

Attached is a screen shot from my cisco 1900

Thank you

[Joseph W. Doherty]

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

Correct, but you might be able to have one ACL that contains entries from both those lists.

Also, if you have an Internet facing interface, a DMZ facing interface and an internal facing interface, you might have a different ACL on each.  Also don't forget "in" vs. "out", i.e. some "in" Interfacing ACE might be suitable as an "out" ACE on the DMZ or internal interface.