DNS anycast node monitor

[Bob Harold]

We use ExaBGP to query the DNS process locally and advertise/withdraw
routes.

We use BFD between the server and the router to detect link failure (or
server crash):
The BFD (Bidirectional Forwarding Detection) protocol is designed to
provide
rapid detection of communication failures between two devices.  Routing
protocols can use BFD state to rapidly (< 1 second) withdraw routes in the
event of a failure, without having to wait for a routing protocol timeout
(3 minutes by default for BGP).

Seems to work well.

-- 
Bob Harold
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