02-27-2007 06:41 AM - edited 03-03-2019 03:56 PM
I have a quick question when you do a static route what is the meaning of Null 0 at the end...eg:
ip route 65.219.101.0 255.255.255.0 Null0
02-27-2007 07:14 AM
The trash can of cyberspace.
Those packets will be effectively discarded.
02-27-2007 07:17 AM
ok thank you
02-27-2007 07:26 AM
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 65.219.101.0 255.255.255.0 Null0
and you are trying to reach 65.219.101.66, you would want a route to 65.219.101.64/x to exist. That way the packet will not be dropped it will be routed to the more specific route.
02-28-2007 01:59 AM
Hi,
There are two things
1. 65.219.101.0/24 belongs to you, ip route 65.219.101.0 255.255.255.0 Null0 means you are advertising your IP block to internet
2. 65.219.101.0/24 does not belongs to you, ip route 65.219.101.0 255.255.255.0 Null0 means any packets coming from that block will be dropped at your wan interface.
Regards
S. Shantharam
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