BCP 38 coverage if top x providers ...

Jared Mauch jared at puck.nether.net
Tue Nov 22 15:44:09 UTC 2016

> On Nov 19, 2016, at 9:13 PM, Frank Bulk <frnkblk at iname.com> wrote:
> My google fu is failing me, but I believe there was a NANOG posting a year
> or two ago that mentioned that if the top x providers would implement BCP 38
> then y% of the traffic (or Internet) would be de-spoofed.  The point was
> that we don't even need everyone to implement BCP 38, but if the largest
> (transit?) providers did it, then UDP reflection attacks could be minimized.
> If someone can recall the key words in that posting and dig it up, that
> would be much appreciated.

If you assume 80% of traffic comes out of your local CDN node, that remaining 20%
may not be too difficult for you to do something with.  The problem appears because
various engineering thresholds that existed in the 90s have been violated.

40(64) byte packet testing is no longer the norm by vendors.  Those of us who carry
a full table and are expected to provide all the features are the minority in
purchasing equipment by volume and revenue so the push is harder.  A double lookup
of the packet is twice as expensive and perhaps impractical in some (or many) cases.

- Jared

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