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

Correct Answer by Jon Marshall about 7 years 4 months 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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