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<div class="moz-cite-prefix">On 21/11/2018 5:42 PM, Grahame Lynch
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CACUGddGSQCo-Y45mMzZpqoYEF5jM7+YBWxpZ0beQfdV33LoyYA@mail.gmail.com">
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<div dir="ltr">How much of this is "hijacking" and how much is
just "least cost routing"? It is really hard to tell.</div>
</blockquote>
Its not 'least cost routing', BGP doesn't work like that, unless the
target networks really were customers of China Telecom, or
customers-of-a-customer.<br>
China Telecom must have started advertising that those networks were
reachable, and then stopped advertising, for the traffic to be sent
into their network in the first place.<br>
<br>
This can happen by accident/incompetence/error, although that
usually results in the affected site being blackholed - thats what
happened with the Telstra BGP hijack of prefixes recently. In this
'diversion' case the traffic is being rerouted and eventually
finding its way back out of the network and forwarded to the
original destination - that is more difficult to make happen by
accident.<br>
<br>
Its arguably laziness on the part of the other networks that China
Telecom interconnects BGP with - peers, upstreams, and customers -
although to be fair the various proposals for validating BGP route
advertising permissions is not widely deployed and still being
developed.<br>
<br>
Most ISPs filter BGP routing advertisements from customers, but very
few filter route advertisements from upstreams and peers.<br>
Securing BGP is a hot topic in recent years, but is taking a long
long time to get critical mass.<br>
<br>
Everyone running BGP-4 should take a look at:<br>
<ul>
<li>MANRS (Mutually Agreed Norms for Routing Security -
<a class="moz-txt-link-freetext" href="https://www.internetsociety.org/issues/manrs">https://www.internetsociety.org/issues/manrs</a>)</li>
<li>RFC7454 = BCP-194 - BGP Operations and Security -
<a class="moz-txt-link-freetext" href="https://tools.ietf.org/html/rfc7454">https://tools.ietf.org/html/rfc7454</a></li>
<li>NIST "Protecting the Integrity of Internet Routing: Border
Gateway Protocol (BGP) Route Origin Validation",
<a class="moz-txt-link-freetext" href="https://csrc.nist.gov/publications/detail/sp/1800-14/draft">https://csrc.nist.gov/publications/detail/sp/1800-14/draft</a></li>
</ul>
...and plan to implement RPKI for all your routes.<br>
<br>
Paul.<br>
<br>
<blockquote type="cite"
cite="mid:CACUGddGSQCo-Y45mMzZpqoYEF5jM7+YBWxpZ0beQfdV33LoyYA@mail.gmail.com"><br>
<div class="gmail_quote">
<div dir="ltr">On Wed, 21 Nov 2018 at 17:38, Christian Heinrich
<<a href="mailto:christian.heinrich@cmlh.id.au"
moz-do-not-send="true">christian.heinrich@cmlh.id.au</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Has anyone
observed<br>
<a
href="https://www.smh.com.au/technology/how-china-diverts-then-spies-on-australia-s-internet-traffic-20181120-p50h80.html"
rel="noreferrer" target="_blank" moz-do-not-send="true">https://www.smh.com.au/technology/how-china-diverts-then-spies-on-australia-s-internet-traffic-20181120-p50h80.html</a><br>
or not?<br>
<br>
-- <br>
Regards,<br>
Christian Heinrich<br>
<br>
<a href="http://cmlh.id.au/contact" rel="noreferrer"
target="_blank" moz-do-not-send="true">http://cmlh.id.au/contact</a><br>
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