Hello all,

I am new to DNS. My goal is to create a sub domain DNS for our lab.
Currently our corporate DNS is served by Windows AD - it is in
10.100.x.x/24. Our lab we have a 192.168.16.0/20 network that is
routed to the corporate network, I have setup a DNS Bind on a CentOS
machine inside the QA lab.

corporate DNS is: host.company.com - 10.100.1.5 - DNS domain name is:
company.com
lab DNS is: myhost.lab.company.com - 192.168.17.2 - DNS sub domain
name is: lab.company.com

1. I configured my Bind so that it is an authoritative server and
simply setup a forwarder to point to my corporate DNS; my
/etc/named.conf file is as follows:

// named.conf file for: lab.company.com
//

options {
listen-on port 53 { 127.0.0.1; 10.100.1.5; };
forwarders { 10.100.1.5 port 53;
};
directory "/var/named";
dump-file "/var/named/data/cache_dump.db";
statistics-file "/var/named/data/named_stats.txt";
/*
};
zone "17.168.192.IN-ADDR.ARPA." IN {
type master;
file "192.168.17.db";
};
zone "lab.company.com." IN {
type master;
file "lab.company.com.db";
allow-transfer {10.100.1.5;};
};
zone "company.com." IN {
type forward;
forwarders { 10.100.1.5; };
};
zone "." IN {
type hint;
file "named.root";
};

zone "localdomain." IN {
type master;
file "localdomain.zone";
allow-update { none; };
};
zone "localhost." IN {
type master;
file "localhost.zone";
allow-update { none; };
};
zone "0.0.127.in-addr.arpa." IN {
type master;
file "named.local";
allow-update { none; };
};
zone "0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0. 0.0.0.0.0.0.ip6.arpa."
IN {
type master;
file "named.ip6.local";
allow-update { none; };
};
zone "255.in-addr.arpa." IN {
type master;
file "named.broadcast";
allow-update { none; };
};
zone "0.in-addr.arpa." IN {
type master;
file "named.zero";
allow-update { none; };
};
include "/etc/rndc.key";

================

Problem: It seems like the setup does not work.
a. I can forward and reverse lookup with hosts within the lab (ok to
forward n reverse lookup among hosts within the 192.168.16.0/20
network).
b. From a host within the 192.168.16.0/20 network, I cannot ping by
hostname to anyhost within the 10.100.x.x. network; BUT I can ping by
FQDN and IP address. same with nslookup.
c. From a host within the 10.100.x.x. I cannot ping by hostname to
anyhost within the 192.168.16.0/20 network; BUT I can ping by FQDN and
IP address; same with nslookup.

the /var/logmessages in my DNS Bind subdomain shows the following error:

Apr 1 09:28:18 myhost NetworkManager:
add_ip4_config_to_named (): Could not set forwarders for zone '.'.
Error: 'Did not receive a reply. Possible causes include: the remote
application did not send a reply, the message bus security policy
blocked the reply, the reply timeout expired, or the network
connection was broken.'.
Apr 1 09:32:30 myhost NetworkManager:
add_ip4_config_to_named (): Could not set forwarders for zone '.'.
Error: 'Message did not receive a reply (timeout by message bus)'.

..... I have attempted to google and review various reference
materials, am unable to figure the issue; Any pointers, advise or
recommendations would be greatly appreciated.

--
best,

Vince