Question

How do I stop a ASA 5505 responding to ping from outside

Asked by: wannabecraig

Hi,

I have an asa 5505 that is currently responding to ping from the internet.
How do I configure it so it does not reply to pings?

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Asked On
2008-05-26 at 07:31:06ID23432702
Tags

Cisco

,

ASA 5505

,

7.2

Topic

Cisco PIX Firewall

Participating Experts
1
Points
250
Comments
7

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Answers

 

by: Net_WorkerPosted on 2008-05-26 at 08:56:25ID: 21646951

You will need to add a rule to block the requests.

icmp deny <ip> <mask> <interface>

 

by: wannabecraigPosted on 2008-05-26 at 09:14:28ID: 21647019

Hi,

is this as an incoming rule on the outside interface?


I've blocked any ICMP from any source to the outside interface. But I still get a reply.

 

by: Net_WorkerPosted on 2008-05-26 at 09:22:17ID: 21647058

Thats correct. If your not familiar with the cli use the ASDM wizards which will help you through this.

 

by: wannabecraigPosted on 2008-05-26 at 09:54:19ID: 21647196

I've used the ASDM to check that this was okay. It looks fine to be honest but I still get a reply.
Any ideas? Any more info you need?

 

by: Net_WorkerPosted on 2008-05-26 at 10:05:21ID: 21647248

When you say replies what do you mean? IF you are pinging from inside the network then from what you have explained this is proper behavior. You have only blocked ICMP from outside-in so internal pings will still echo.

 

by: wannabecraigPosted on 2008-05-26 at 10:13:02ID: 21647279

Hi,

I have a second iNet connection on the internet that gets a reply. I'll try it from home to make sure and let you know tomorrow.

 

by: Net_WorkerPosted on 2008-05-26 at 10:47:00ID: 21647407

The ASA should by default block ping from a higher level security interface to a lower level interface. If not you should ensure that you have a line in your config with;

icmp deny any Outside

Beyond that there may be an access list which is permitting ICMP from outside.

20120131-EE-VQP-002

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