Why won't providers source-filter attacks? Simple.

Randy Bush randy at psg.com
Wed Feb 5 01:40:55 UTC 2014

> No, you write a law requiring something, e.g. BCP 38 filtering by
> ISPs, and you audit it.  You also make the ISPs directors liable
> for the impact that results from spoofed traffic from them.
> Making it law puts all the ISP's in the country on a equal footing
> with respect to implementation costs.

you have done this in your network, the isp for which you are an


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