On 23 May 2018 at 07:37, Blason R <blaso...@gmail.com> wrote: > Hi Guys, > > Can we define masters as hostname instead of IP address? I guess its not > possible but wondering if community can shed come light on this? > > The short answer.. no, you can't do that. The definition for the slave zone statement's 'masters' option (BIND 9.11 ARM pp 139) is pretty clear that you can only use IP addresses and named masters lists. You could fake it by defining a named master list (pp. 70) but I suspect that isn't going to do what you want.
I think the rationale for not allowing hostnames there is that you can easily put yourself in a unresolvable (pardon the pun) situation where your slave can't reach the master until your slave reaches the master and gets a copy of a key zone. I can also see the potential for complication even if there weren't a catch-22 in the configuration, such as what to do if the hostname referenced has multiple addresses associated with it; that would have implications for things like how complex it is to track whether a master is available or not. I'm sure there are other complexities I haven't thought of.
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