InstaCarma Blog » Routing http://www.instacarma.com/blog Information Resource for Web Hosting Technical Support and Server Management Tue, 24 May 2011 10:01:02 +0000 en hourly 1 http://wordpress.org/?v=3.2 Null-routing an IP using Routing Table http://www.instacarma.com/blog/technical/null-routing-an-ip-using-routing-table/ http://www.instacarma.com/blog/technical/null-routing-an-ip-using-routing-table/#comments Wed, 08 Jul 2009 19:40:16 +0000 admin http://instacarma.com/blog/?p=610 Filed under: Routing

Issue :

How to null-route IP addresses via Routing Table ?

Fix :

To block a single IP :

ip route add blackhole XX.XX.XX.XX

To block a network range :

ip route add blackhole XX.XX.XX.XX/16

To remove the block :

ip route del XX.XX.XX.XX
ip route del XX.XX.XX.XX/16

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