DNS anycast node monitor

[Hillary Nelson]

Currently we have about 20 DNS servers sit behind two pairs of F5 LTM on
campus, the two pairs of F5s using router injection for DNS virtual
addresses. This setup is costly and we are trying to use direct anycast
between router and server instead, with quagga and bgp.

The decision of advertise/withdraw route seems to be most critical one. I
guess we'll need two monitors, one on the server, another like nagios
monitor from a remote system.  I know there are people doing this for many
year, wonder if
there are working script that would like to share.

Thanks!

Hillary
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