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How to setup a incoming IP Blocklist on ASA 5505

Posted on 2011-03-16
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Last Modified: 2012-05-11
I am looking to block certain IP Addresses at the firewall from accessing my network. It looks like someone is accessing our RWW and is trying to guess passwords. I access event viewer to obtain the ip address that is trying to hack in. I want to create a list on the ASA 5505 to block these IP's. I am new with the ASA 5505 and would like to use the GUI to do this. Can someone provide me with step by step instructions on how to do this.
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Question by:Djrobluv
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Expert Comment

by:MikeKane
ID: 35149628
On my ASAs I setup an obect group called "Evil IPs".   In this group I list out any IPs I want to block from everything.  


To do this, create the Object group ASDM - Configuration - Firewall - Objects - Network objects - ADD - Object group.   Call it Evil_ip (or whatever), then add in the IPs and/or ranges you would like to block.  


Next, you would add an access list item to the very top of your ACL for the outside interface.  
ASDM - Configuration - Firewall - ACL Manager.   In the ACL used to control the access coming from the Public internet, you will want to ADD a new ACE, select Deny, source is the "evil_ip" group you just created, destination is ANY, select all IP.  

That's it.    The ACL are evaluated from top to bottom so having the deny at the top means that the IPs in the  Evil IP list will be blocked no matter if new reules are added below.  


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Author Comment

by:Djrobluv
ID: 35150008
Ok, when I log into my ASA 5505 I see configuration, but I don't see firewall under this option. Here is what I have: Interfaces, security Policy, Nat, Vpn, CSD Manager, Routing, Global Objects, Properties. I'm thinking Global Objects is what I should be clicking on and under Add I have 2 options: Network Object and Network Object Group. I want to make sure I'm doing the right thing here, can't afford a oops.
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LVL 33

Expert Comment

by:MikeKane
ID: 35157989
I could give you the commands if you are familiar enough with the CLI...
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Author Comment

by:Djrobluv
ID: 35158022
Ok that would work also, but would like to be able to do it through the ADSM when I need to add more IP's
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Accepted Solution

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MikeKane earned 500 total points
ID: 35180724
It would look like this:

object-group network Evil_IPs
 description All Blocked IPs
 network-object host <Ip address 1>
 network-object host <Ip address 2>
 network-object host <Ip address 3>

(make this the first ACE in your ACL)
access-list acl_outside extended deny ip object-group Evil_IPs any


In the ASDM, you would see this new group listed under network objects and you can keep adding new IPs to block.
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