IPv4 squatting: awareness raising and research
25 Mar 2010
As has been noted again in recent days, some ISPs, vendors and end users have been using previously unallocated IPv4 blocks to address their own networks and devices. When these address blocks become officially allocated or assigned, the prior use can lead to routing problems both for the new holder of the addresses and the person who used them without authorization. This is an unfortunate problem that we have been trying to raise awareness of over the last few years.
In September 2007 I wrote an article about the issue for Cisco’s IP Journal. Over the next few months we conducted some preliminary research into the extent of this usage and presented the preliminary findings at a few network operator meetings.
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