DNS server can't find PTR record: NXDOMAIN

Question

I tried to set up bind DNS in Ubuntu.

I have 2 machine:

machine A is client:

IP: 192.168.190.176  
hostname: example.com 

machine B is DNS Server:

IP: 192.168.190.171 

In DNS server:

/etc/bind/named.conf.local:

zone "example.com" {
        type master;
        file "/etc/bind/db.example.com";
};
//reverse zone
zone "190.168.192.in-addr.arpa" {
        type master;
        file "/etc/bind/db.192";
};

/etc/bind/db.example.com:

$TTL    604800
@       IN      SOA     example.com.        root.example.com. (
                              2         ; Serial
                         604800         ; Refresh
                          86400         ; Retry
                        2419200         ; Expire
                         604800 )       ; Negative Cache TTL
;
@       IN      NS      example.com.
@       IN      A       192.168.190.176
@       IN      AAAA    ::1

/etc/bind/db.192:

$TTL    604800
@       IN      SOA     example.com. root.example.com. (
                              1         ; Serial
                         604800         ; Refresh
                          86400         ; Retry
                        2419200         ; Expire
                         604800 )       ; Negative Cache TTL
;
@       IN      NS      example.com.
176.190.168     IN      PTR     example.com.

And in Client:

nslookup 192.168.190.176
Server:     192.168.190.171
Address:    192.168.190.171#53

** server can't find 176.190.168.192.in-addr.arpa: NXDOMAIN

Can you fix it?

UPDATE: I try with nslookup example.com

server can't find example.com: SERVFAIL

Solution

You are overdoing it.

In your /etc/bind/named.conf.local file, you have already declared the snippet for reverse zone 190.168.192.in-addr.arpa i.e. 192.168.190:

zone "190.168.192.in-addr.arpa" {
        type master;
        file "/etc/bind/db.192";
};

Now in /etc/bind/db.192 file, you just need to refer to the last octet of the IP address, not the whole address; in fact, even more than one octet would be incorrect.

Presumably you are planning to assign 176 as the last octet i.e. the PTR RR, so just add:

176     IN      PTR     example.com.

Comments

[heemayl]

Just use 176 IN PTR example.com.

[QChí Nguyễn]

But i try test with nslookup example.com, it don't work

[QChí Nguyễn]

I found resolve way, just ping -a ip

[eckes]

dig is your friend for testing DNS