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Operating Systems Linux Red Hat DNS for linux RedHat
# 1  
Old 01-28-2011
DNS for linux RedHat
Dear members,

I am trying to set up a simple DNS but the problem is that when I ping the name of the IP address in the Reverse file, it does not recognise it. My code are as follows:

Note that my IP address is 172.22.45.237.

In my /etc/named.conf file, I have added the following lines
Code:
zone  "tuffy.org" { 
        type master; 
        file  "local.zone"; 
};

zone  "45.22.172.in-addr.arpa" {
        type master;
        file  "local.rev";
};

In my /var/named/local.zone file, I have the following codes:
Code:
@       IN      SOA     tuffy.org. root.tuffy.org. (
                         1998121401         ; Serial
                               604800         ; Refresh
                                86400          ; Retry
                             2419200         ; Expire
                              604800 )       ; Default TTL
     
             IN      NS      dns.tuffy.org.
             
www IN A 172.22.45.237

dns IN A 172.22.45.237

In my /var/named/local.rev file, I have the following codes:
Code:
@       IN      SOA     tuffy.org. root.tuffy.org. (
                          1998121401         ; Serial
                              604800         ; Refresh
                               86400         ; Retry
                             2419200         ; Expire
                            604800 )       ; Default TTL
     
             IN      NS      dns.foo.org.
237 IN PTR www.tuffy.org.

237 IN PTR dns.tuffy.org.

When I ping either dns.tuffy.org or the other one, it says that the name cannot be recognised. Can anyone help me to correct the error in my files?
# 2  
Old 01-28-2011
this may be a silly question, but what does your /etc/resolv.conf and /etc/nsswitch.conf look like on the box you're resolving from?
# 3  
Old 01-28-2011
My /etc/resolv.conf file looks like this
Code:
domain tuffy.org
search tuffy.org
nameserver 172.22.45.237

As for /etc/nsswitch.conf, i didn't know that we should modify it. What should I modify in this file?
# 4  
Old 01-28-2011
the /etc/nsswitch.conf "hosts:" line should contain at least "dns". I'm quite sure it's the default these days anyway.

One question, the one NS record in your reverse file:

Code:
 dns.foo.org.

Is that intentionally "foo", and not "tuffy" ?
# 5  
Old 01-28-2011
Its a mistake I have made while typing. It should be
Code:
dns.tuffy.org

. Even though when I try to ping or do nslookup with the IP-address, it does not return the domain name
# 6  
Old 01-28-2011
Well, you have 2 PTR records. That's not allowed (at least I don't think so, but the RFC may state otherwise).

I would suggest you only have one "dns" PTR record, and make "www" a CNAME (but not in the reverse file Smilie
# 7  
Old 01-28-2011
Ok, I will try that. Thanks for your help
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