Null 0

Unanswered Question
Feb 27th, 2007

I have a quick question when you do a static route what is the meaning of Null 0 at the

ip route Null0

I have this problem too.
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ahmednaas Tue, 02/27/2007 - 07:14

The trash can of cyberspace.

Those packets will be effectively discarded.

deilert Tue, 02/27/2007 - 07:26

Null 0 is generally used for summarization with the expectation that when the packet reaches the router generating the Null 0 route a more specific route will exist.

For example if you have a route

ip route Null0

and you are trying to reach, you would want a route to to exist. That way the packet will not be dropped it will be routed to the more specific route.

shantharam.sury... Wed, 02/28/2007 - 01:59


There are two things

1. belongs to you, ip route Null0 means you are advertising your IP block to internet

2. does not belongs to you, ip route Null0 means any packets coming from that block will be dropped at your wan interface.


S. Shantharam


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