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<div class="moz-cite-prefix">On 07/01/14 14.16, Bob McDonald wrote:<br>
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<div>> Unless the goal is to move all DNS services off that
subnet. Our network<br>
> staff would love to reclaim the /24 our DNS servers are
tying up with very<br>
> little else on it wasting 250 addresses.<br>
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I'm not sure I'm describing a properly configured anycast
environment well. Since in anycast the client never see the
"physical" address of a DNS server, it matters not where they
(the DNS server(s)) "physically" are (only if they are in the
anycast cloud or not). You can move them around (insert/delete
servers to/from the cloud) to your heart's content and the
client doesn't know. The requirement here (to avoid having
clients left on legacy devices) is that all the affected servers
be in the anycast cloud and all of your client devices point to
the "logical" anycast address for DNS resolution NOT the
"physical" address(es) of the DNS server(s). You add the new
server(s) to the cloud and delete the legacy server(s) from the
cloud. Easy peasey. Obviously, this takes some up front
planning and having a group of servers on the same subnet is
probably not a good idea (although it could be interesting from
a load sharing perspective...). YMMV, it's just a thought.<br>
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If I understood the problem correctly, the address the anycast would
take is the address the clients actually use and the new servers can
be set anywhere. In this case they want to free that address for
other purposes.<br>
Again if I understand this correctly anycast might be fine for
future but a bit too late in this case.<br>
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<pre class="moz-signature" cols="72">--
Best regards
Sten Carlsen
No improvements come from shouting:
"MALE BOVINE MANURE!!!"
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