I have the following layout
DNS01 - Master DNS02 - Remote slave DNS03 - Local network slave
The master is configured so:
acl HLLnetworks { 209.47.176/24; 216.185.71/24; };
options { allow-query { any; }; allow-recursion { HLLnetworks; }; allow-transfer { HLLnetworks; }; directory "/var/named"; dump-file "/var/named/data/cache_dump.db"; statistics-file "/var/named/data/named_stats.txt"; query-source address 216.185.71.33; listen-on { 216.185.71.33; }; notify yes; };
The slaves are configured this way (appropriately modified for each ip address:
acl HLLnetworks { 209.47.176/24; 216.185.71/24; };
options { allow-query { any; }; allow-recursion { HLLnetworks; }; allow-transfer { HLLnetworks; }; directory "/var/named"; dump-file "/var/named/data/cache_dump.db"; statistics-file "/var/named/data/named_stats.txt"; notify no; // this is a slave server query-source address 209.47.176.33; listen-on { 127.0.0.1; }; listen-on { 209.47.176.33; }; forwarders { 216.185.71.33; }; };
Now, what I am seeing on one of the slaves when I change a zone in the master and reload is this:
Nov 3 12:47:49 inet06 named[9597]: received notify for zone 'byrnejb.ca'
but on the other I see this:
Nov 3 12:47:50 inet04 named[18368]: client 216.185.71.27#33829: received notify for zone 'byrnejb.ca' Nov 3 12:47:50 inet04 named[18368]: zone byrnejb.ca/IN: refused notify from non-master: 216.185.71.27#33829
The master configuration for byrnejb.ca is
zone "byrnejb.ca" { type master; file "/var/named/masters/byrnejb.ca.hosts"; };
On inet06 the slave zone configuration is:
zone "byrnejb.ca" { type slave; masters { 216.185.71.33; }; file "/var/named/slaves/byrnejb.ca.hosts"; };
and on inet04 it is:
zone "byrnejb.ca" { type slave; masters { 216.185.71.33; }; file "/var/named/slaves/byrnejb.ca.hosts"; };
Which is, as far as I can see, identical.
In any case, the real problem is that neither slave actually transfers the updated zone file and I cannot figure out why not. I have verified that the master zone file serial number is greater than that of the slave zones.
So, I have two questions:
1. Why is the source address 216.185.71.27 when the bind named listens on 216.185.71.33 and answers queries from the same address. Admittedly, 216.185.71.33 is a virtual ip hosted on 216.185.71.27 but we have been doing this for over a decade now and I have never seen this behaviour before.
2. Why are the notifies ignored? Again, we have had this set up for over a decade and none of these problems until now, and the only thing that has happened on the dns side of things recently were the CentOS updates last week.
I am not a DNS specialist, I set this up several years ago and I am perplexed as to why it is now giving me these difficulties. Any help would be gratefully appreciated.
Sincerely,