On 12/09/2008, at 10:42 PM, Gadi Evron wrote:
Hi, WatchMy.Net is a new community service to alert you when your
prefix
has been hijacked, in real-time.
Hi Gadi,
I just had a quick play with this, as I've been considering hacking
together something similar.
It is trivially easy for an attacker to falsify the origin AS. If
'they' are not doing it already, then I'm quite surprised.
This isn't really a good thing to alarm on, in my opinion. Or, maybe
it is, but there should be big bold text explaining that it's not
reliable as it's trivially easy to falsify.
To be honest, I can't think of anything better, all the attributes you
can monitor can easily be falsified.
My best idea is looking at the AS_PATH for changes, and alerting
whenever that happens. You'd obviously get a different path whenever
there is churn in the network though. I'm sure there's a way to do
this, and I suspect having BGP feeds from many many places is the most
reliable way for it to happen, I just haven't figured out why yet.
This seems like a service that Renesys etc. could/should (or maybe
do?) offer, they seem well placed with all their BGP feeds..
--
Nathan Ward
