Re: 20-30Gbps UDP 1720 traffic appearing to originate from CN in last 24 hours

[James Milko <jmilko () gmail com>]

On Mon, Jul 20, 2015 at 3:40 PM, ML <ml () kenweb org> wrote:

> On 7/20/2015 2:57 PM, Valdis.Kletnieks () vt edu wrote:
>
> > On Mon, 20 Jul 2015 19:42:39 +0100, Colin Johnston said:
> >
> > > see below for china ranges I believe, ipv4 and ipv6
> > You may believe... but are you *sure*?  (Over the years, we've seen
> > *lots* of "block China" lists that accidentally block chunks allocated
> > to Taiwan or Australia or other Pacific Rim destinations).
> If you really wanted to go the route of blocking all/almost all China.
> Isn't there a short list of ASNs that provide transit to China
> citizens/networks?
> I'm referring to AS4134, AS4837, etc
> Wouldn't blackholing any prefix with those ASNs in the AS path accomplish
> the goal and stay up to date with a new prefixes originated from China?
That would prevent you from responding to their traffic (assuming DFZ),
 but their traffic would still have a valid route to your network.

JM