Once again about pinging ASA's Outside interface from Internal network

Answered Question
Aug 4th, 2010
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Dear all,

recently I faced a problem when we launched HP OV monitoring system. It is required to ping all enabled interfaces on ASA. "Inside" interface is monitored well but "Outside" is unavailable by ICMP and due to this alarm generated. I know that PIX's and ASA's with 7.x versions of software don't allow to do this (this is clearly noticed in documentation, here for example). But in documentation for version 8.2 (actually this version software installed now) I can't find any information regarding this question. I wonder if I missed something and such function was enabled in recent versions of software?


Cheers,
Dmitriy

Correct Answer by mirober2 about 6 years 11 months ago

Hi Dmitriy,


Jitendriya is correct--it is still not possible to ping a far-side interface on the ASA. This is by design and cannot be changed due to security restrictions. Here is the documentation for 8.2 that outlines this:


http://www.cisco.com/en/US/docs/security/asa/asa82/command/reference/i1.html#wp1697623



The adaptive security appliance only responds to ICMP traffic sent to the interface that traffic comes in on; you cannot send ICMP traffic through an interface to a far interface. 

Hope that helps.


-Mike

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Jitendriya Athavale Wed, 08/04/2010 - 23:39
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i think its still not possible but i can confirm on that, its more of a security feature which doesnt let u ping accross the asa and dont htin kthat would change


in any case i can confirm tht

Correct Answer
mirober2 Thu, 08/05/2010 - 11:40
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  • Cisco Employee,

Hi Dmitriy,


Jitendriya is correct--it is still not possible to ping a far-side interface on the ASA. This is by design and cannot be changed due to security restrictions. Here is the documentation for 8.2 that outlines this:


http://www.cisco.com/en/US/docs/security/asa/asa82/command/reference/i1.html#wp1697623



The adaptive security appliance only responds to ICMP traffic sent to the interface that traffic comes in on; you cannot send ICMP traffic through an interface to a far interface. 

Hope that helps.


-Mike

Jitendriya Athavale Wed, 08/04/2010 - 23:47
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That’s is only to access the interface on the other side through the vpn tunnel


The idea behind this is since you are using vpn to get in through the outside, there is no reason why I should be denying you from accessing the firewall using my inside ip because ideally vpn means internal (network that u trust) so they are like your inside


This feature is mainly introduced to manage the firewall through the vpn


This command works only for the vpn traffic and also you can configure only 1 interface as management-access


Hope this helps

Helpdesk_ Fri, 08/06/2010 - 02:30
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Thanks a lot to all of you, guys. I will keep in mind that this is not possible.


Best regrads,

Dmitriy

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