How to request ixfr updates against public ip directly instead of unicast ip in bind

Barry Margolin barmar at
Thu Oct 13 15:15:43 UTC 2016

In article <mailman.443.1476295334.74444.bind-users at>,
 Matus UHLAR - fantomas <uhlar at> wrote:

> On 12.10.16 20:57, rams wrote:
> >I have master and slave servers. When we have updates in master, slave is
> >getting updating after 20 or 30 minutes.
> >When I look into tcpdump pcakets, Slave is trying with master unicast ip to
> >get updates. We don't have port opened slave to master with unicast ip and
> >we have port opened slave to master with public ip.
> >
> >Do we have any option checking for SOA value directly with public ip of
> >master instead of unicast ip.
> I don't get it. What do you mean by "unicast" and "public" IP?

My guess was that he's doing Anycast DNS for his public IP, and the 
unicast address is the real address that the router forwards to.

Or he's just confused about terminology, and used "unicast IP" to mean 
"private IP"

Barry Margolin
Arlington, MA

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