quick prefix filtering survey

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A while ago we studied prefix filtering in partial deployment. See Figure 18 on pg 15 of this paper, and the text explaining it in the middle of the right column on pg 15:
http://research.microsoft.com/pubs/120428/BGPAttack-full.pdf

Now, we are wondering how many networks implement prefix filtering, and who they filter.
My team can do some research on the impact of this this summer, and report the results back to NANOG.

To help us, answer the following questions! This survey is anonymous.

Direct questions to Sharon Goldberg: goldbe@cs.bu.edu

What kind of network do you operate?

What sort of prefix filtering do you do in your network?

Note: We define a stub AS to be an AS without customers of its own. Pick as many of the below that apply to you.

I don't filter

I filter all of my downstream stub ASes.

I filter some downstream stub ASes

I filter all of my downstream ASes

I filter some of my downstream ASes

I filter some of my downstreams downstreams.

I filter all of my downstreams downstreams.

I filter my entire customer cone. (Ie downstreams of downsteams of downstreams etc...)

Other

If you check one of the boxes above that includes the word "some" , what fraction of your downstreams do you filter?

Optional: Tell us anything else about filtering practices at your ISP or at other ISPs.

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