Zimbra

strafford · #1 (**permalink**) 04-09-2010, 11:33 AM

I have setup a split DNS and most is working except when I do a dig (for mx record) I get a double domain answer.

dig +short mydomain.com mx:

Code:

10 mailserv.mydomain.com.mydomain.com.

This should be mailserv.mydomain.com shouldn't it? I have searched a bunch of posts and here is the info that is most often requested.

dig +short mydomain.com any:

Code:

mydomain.com. scott.mydomain.com. 70728 604800 86400 2419200 604800
192.168.7.101.mydomain.com.
192.168.7.101
10 mailserv.mydomain.com.mydomain.com.

/etc/hosts:

Code:

127.0.0.1       localhost.localdomain localhost
192.168.7.101   mailserv.mydomain.com mailserv

/etc/resolv.conf:

Code:

nameserver 192.168.7.101

host `hostname`:

Code:

Host mailserv not found: 3(NXDOMAIN)

/etc/bind/named.conf.options:

Code:

options {
        auth-nxdomain no;    # conform to RFC1035
        query-source address * port 53;
        directory "/var/named";
        dump-file "/var/named/data/cache_dump.db";
        statistics-file "/var/named/data/named_stats.txt";
        forwarders { 24.226.1.93; 24.226.10.193; };
};
include "/etc/bind/rndc.key";
zone "mydomain.com" {
        type master;
        file "/var/named/db.mydomain.com";
};

/var/named/db.mydomain.com:

Code:

;
; BIND data file for mydomain.com
;
$TTL    604800
@       IN      SOA     mydomain.com. scott.mydomain.com. (
                         070729         ; Serial
                         604800         ; Refresh
                          86400         ; Retry
                        2419200         ; Expire
                         604800 )       ; Negative Cache TTL
;
@       IN      NS      192.168.7.101
        IN      A       192.168.7.101
        IN      MX      10 mailserv.mydomain.com
mailserv        IN      A       192.168.7.101

nslookup:

Code:

Server:         192.168.7.101
Address:        192.168.7.101#53

Name:   mailserv.mydomain.com
Address: 192.168.7.101

Any help would be greatly appreciated.

Regards,
Scott

strafford · #2 (**permalink**) 04-09-2010, 01:44 PM

Ok. I have been playing around and have modified this line of my /var/named/db.mydomain.com file:

Code:

IN      MX      10 mailserv.mydomain.com

to:

Code:

 IN      MX      10 mailserv

This seems to work better. How can I tell if this is working for sure? I can do an nslookup on both the fake domain and external domains, and dig commands now show (what I think is) properly:

Code:

user@mailserv:~$sudo dig +short mydomain.com mx
10 mailserv.mydomain.com

strafford · #3 (**permalink**) 04-09-2010, 01:58 PM

When logged in to the Admin GUI, I click on 'Check MX Record' for my server and get this error:

Failed to retrieve MX records for domain mailserv.rci.ca

phoenix · #4 (**permalink**) 04-09-2010, 11:18 PM

You're missing some vital information from the DNS config files, there's a period "." missing from some of the lines hence the 'double domain name'.

The following lines:

Code:

        IN      MX      10 mailserv.mydomain.com
mailserv        IN      A       192.168.7.101

should look like this:

Code:

mydomain.com.        IN      MX      10 mailserv.mydomain.com.
mailserv.mydomain.com.        IN      A       192.168.7.101

Note the addition of the period at the end of each instance of the domain name. The configuration of a Split DNS is detailed in the wiki article.

uxbod · #5 (**permalink**) 04-09-2010, 11:59 PM

Have the zone file like

Code:

        IN      MX      10 mailserv
mailserv        IN      A       192.168.7.101

if completely fine as it will use the domain name from the zone to complete each short name. Lets start from the top again and see what is happening

Code:

cat /etc/hosts
cat /etc/resolv.conf
dig +short yourdomain mx
dig +short yourdomain any
host `hostname` <- note backticks and not singles quote

Would you also please post your named.conf and zonefiles again.

strafford · #6 (**permalink**) 04-12-2010, 06:35 AM

Both seem equally correct solutions. However, neither allows the host command to work:

Code:

rci@mailserv:~$ host `hostname`
Host mailserv not found: 3(NXDOMAIN)

Code:

rci@mailserv:~$ cat /etc/hosts
127.0.0.1       localhost.localdomain localhost
192.168.7.101   mailserv.mydomain.com mailserv

rci@mailserv:~$ cat /etc/resolv.conf
nameserver 192.168.7.101

rci@mailserv:~$ dig +short mydomain.com mx
10 mailserv.mydomain.com.

rci@mailserv:~$ dig +short mydomain.com any
mydomain.com. scott.mydomain.com. 70732 604800 86400 2419200 604800
192.168.7.101.mydomain.com.
192.168.7.101
10 mailserv.mydomain.com.

Zone file:

Code:

;
; BIND data file for mydomain.com
;
$TTL    604800
@       IN      SOA     mydomain.com. scott.mydomain.com. (
                         070732         ; Serial
                         604800         ; Refresh
                          86400         ; Retry
                        2419200         ; Expire
                         604800 )       ; Negative Cache TTL
;
@       IN      NS      192.168.7.101
        IN      A       192.168.7.101
        IN      MX      10 mailserv
mailserv        IN      A       192.168.7.101

named.conf.options:

Code:

options {
        auth-nxdomain no;    # conform to RFC1035
        query-source address * port 53;
        directory "/var/named";
        dump-file "/var/named/data/cache_dump.db";
        statistics-file "/var/named/data/named_stats.txt";
        forwarders { 24.226.1.93; 24.226.10.193; };
};
include "/etc/bind/rndc.key";
zone "mydomain.com" {
        type master;
        file "/var/named/db.mydomain.com";
};