ASA Null0 interface

Answered Question
Oct 13th, 2009

Dear NetPro!

I would like to route some prefix to null0 in a Cisco ASA 5540 perimeter firewall. I have found no information about this virtual interface in ASA. Does anybody have any experience how to configre and implement these static routes?

Thanks in advance!

BR

Belabacsi

I have this problem too.
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Correct Answer by Jon Marshall about 7 years 1 month ago

Belabasci

AS far as i know the ASA does not support a Null0 interface in the same way IOS routers do.

The solution i have used is to point the routes to the nearest next-hop router under your control and then Null0 them on that router.

Jon

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Correct Answer
Jon Marshall Tue, 10/13/2009 - 09:44

Belabasci

AS far as i know the ASA does not support a Null0 interface in the same way IOS routers do.

The solution i have used is to point the routes to the nearest next-hop router under your control and then Null0 them on that router.

Jon

Herbert Baerten Tue, 10/13/2009 - 13:12

There is no such thing on ASA. Why not simply deny the traffic in your access-list(s) ?

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