putting several master DNS hosts behind a vip

Anand Buddhdev anandb at ripe.net
Thu Dec 10 08:10:17 UTC 2015

On 10/12/15 00:32, blrmaani wrote:

Hi Blr,

> I would like to put 4 DNS masters behind a vip and have several
> slaves doing the zone transfer from the VIP-IP. Is this normal?
> The usual approach is to have slaves getting zone transfers from
> multiple masters. What is the disadvantage of having slaves using just
> the vip and have all masters behind the vip?

There's something else to keep in mind. Suppose you have 4 servers
behind the VIP. One of them has an updated zone, and sends notify to a
slave. If the slave now tries an XFR, its TCP connection may actually
end up on another master in the group. If that master isn't yet updated
with the latest copy of the zone, the client will not actually get an

Of course, this all depends on how you're updating your masters, but
since we don't know that, I can't comment further.


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