Revealed: The Internet's well known BGP behavior

Boyd, Benjamin R Benjamin.R.Boyd at
Thu Aug 28 10:36:05 CDT 2008

We've encountered the same diligence with LVL3, especially after
acquisitions where records haven't been updated yet.  Although a little
annoying it's quite refreshing.

>-----Original Message-----
>From: Eric Spaeth [mailto:eric at] 
>Sent: Thursday, August 28, 2008 1:41 AM
>To: Jon Lewis; nanog at
>Subject: Re: Revealed: The Internet's well known BGP behavior
>Jon Lewis wrote:
>>> At 11:32 PM 27-08-08 -0500, John Lee wrote:
>>> They didn't have control of any routers other than their own.  What 
>>> they had to find is a single clueless upstream ISP that would allow 
>>> them to announce prefixes that didn't belong to them.
>> Clueless or big and inattentive?  AFAIK, Level3 will accept anything 
>> from long as I put it in one of the IRRs the day 
>before I plan 
>> to announce it.
>Working for a company that has been steadily growing through 
>acquisition, we have actually run into this problem a couple times 
>before.   I'm not sure if we hit the lottery, but our upstream 
>(including LVL3) have definitely intervened when we've moved 
>netblocks from a company that doesn't match our name into our 
>facilities to be advertised under our ASNs.  I'm not sure how 
>diligent or widespread the validation checks are, but at least 
>on occasion they do occur.


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