Prefix Hijack Tool Comaprision

Martin List-Petersen martin at
Thu Nov 13 21:06:54 UTC 2008

Alexander Harrowell wrote:
> OK. This seems to be a flaw in RIPE RIS, a pity because BGPlay is great.

It is not a flaw in RIPE RIS. One of the RIPE RIS servers was just 
within the AS'es that where affected, so it will show up. What BGPplay 
og BGPmon do with that data afterwards is an entire different story.

RIPE RIS just collects data from various viewpoints. It's the users, 
that have to create the threshoulds or to decide how significant that 
data is.

Kind regards,
Martin List-Petersen
Airwire, Galway, Eire

> - original message -
> Subject:	Re: Prefix Hijack Tool Comaprision
> From:	Todd Underwood <todd at>
> Date:		13/11/2008 8:05 pm
> alexander, all,
> On Thu, Nov 13, 2008 at 07:56:26PM +0000, Alexander Harrowell wrote:
>> It may be the North American NOG, but it's been said before that it
>> functions as a GNOG, G for Global. I don't think Brazil is
>> insignificant. I respect Todd's work greatly, but I think he's wrong
>> on this point. 
> you misread me.
> i did not say that brazil was insignificant. it's not.  it has some of
> the fastest growing internet in latin america.  
> i said that *this* hijacking took place in an insignificant corner of
> the internet.  i mean this AS-map wise rather than geographically.
> this hijacking didn't even spread beyond one or two ASes, one of whom
> just happened to be a RIPE RIS peer.  
> real hijackings leak into dozens or hundreds or thousands of ASNs.
> they spread far and wide.  that's why people carry them out, when they
> do.  this one was stopped in its tracks in a very small portion of one
> corner of the AS graph.  
> as such, i don't count it as a hijacking or leak of any great
> significance and wouldn't want to alert anyone about it.  that's why i
> recommend that prefix hijacking detection systems do thresholding of
> peers to prevent a single, rogue, unrepresentative peer from reporting
> a hijacking when none is really happening.  others may have a
> different approach, but without thresholding prefix alert systems can
> be noisy and more trouble than they are worth.
> sorry if it appears that i was denegrating .br .  i was not.
> t.

Airwire - Ag Nascadh Pobal an Iarthar
Phone: 091-865 968 

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