On 07/06/12 12:45, Scott Armitage wrote:
>
> Only 2 of our 3 DNS Servers are blacklisted.
How are clients distributed amongst your DNS servers?
We have two virtual IPs that point to all 4 resolvers. One IP is served
by Cisco ACE devices as a VIP, the other is an anycast IP injected in
the routing table via eBGP.
The latter will tend to send the same client to the same server, given
CEF load balancing. But the former will pretty evenly distribute clients
across DNS servers, over time. I suspect this is why all four of ours
are blacklisted.
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