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IOS Zone Based Policy Firewall self zone

Posted on 2013-12-16
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Last Modified: 2013-12-17
Is it ok to implement a zone out-to-self but not self-to-out?  The end result I want is to restrict inbound UDP traffic to a particular source address.  But I want any traffic originating from the router to be permitted outbound.  I wondered if simply omitting the self-to-out zone would be the same.  Thanks.
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Question by:amigan_99
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Quori earned 2000 total points
ID: 39725210
If you want to restrict inbound traffic to the router to specific ports and drop all else you'll need to configure a drop statement in the default class, because the self zone doesn't have the implicit deny function of normal zones.

That said, because you've got to configure an explicit deny, any traffic leaving the router will have its return traffic dropped so you'll need to configure inspection policies (where supported) to make sure pin holes are punched in the firewall for return traffic.
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by:amigan_99
ID: 39725219
Thank you.  I put the proposed config here.  If you have a minute - let me know if I'm on the right track.  Thank you.  http://www.experts-exchange.com/Hardware/Networking_Hardware/Routers/Q_28320610.html
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