IPv6 - can't get rDNS to work!

Nick57

Well-Known Member
Jul 19, 2005
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Dear cPanel,

I have followed your instructions exactly in creating this rDNS for a few IPv6 addresses, but it is not working for me.

There is a new zone file, called ipv6.arpa
This zone file is loaded on all my four cPanel DNSonly servers.
This zone file is more then four days old and really should be propagated on the Internet by now.
I have for privacy reasons masked the last nibbles.

IPv6 works on the server.

dig -x 2002::xxxx:xxxx @localhost +short
output: domain name.

ping6 domain
output: as expected.

ping::1
output as expected.
Any suggestions what could be wrong?

run: /usr/local/cpanel/scripts/configure_rh_ipv6_firewall_for_cpanel

Using CSF as firewall.

Attached Image with content of the zone file.
 

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Last edited:

cPanelMichael

Administrator
Staff member
Apr 11, 2011
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Hello :)

It's important to keep in mind that native support for RDNS with IPv6 is not yet included with cPanel. You can open a feature request for this via:

Submit A Feature Request

In the meantime, you can manually create the zone via the command line using the following as a template:
Code:
;
; 2001:db8::/48
;
$TTL 1h	; Default TTL
@	IN	SOA	ns1.example.com.	admin.example.com. (
	2014010801	; serial
	1h		; slave refresh interval
	15m		; slave retry interval
	1w		; slave copy expire time
	1h		; NXDOMAIN cache time
	)

;
; domain name servers
;
@	IN	NS	ns1.example.com.


; IPv6 PTR entries
1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa.    IN    PTR    host1.example.com.
Note that you can generate a zone using a zone generator such as RDNS IPv6 Zone Generator if necessary.

Thank you.
 

cPanelMichael

Administrator
Staff member
Apr 11, 2011
47,913
2,201
363
There are no references to IPv6 on the document you referenced. There were in the past, but those references were removed about a month ago per internal case 79061. You may want to try clearing your browser cache if you still see references to IPv6 on that document.

You can simply create a zone using the template from my last response in the /var/named directory, ensure ownership and permissions match the other zone files (0600 permissions and "Named" ownership) and then rebuild the /etc/named.conf file after that via:

Code:
/scripts/rebuilddnsconfig
The zone file name would be 1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa.db in the example posted in my last response.

Thank you.
 

cPanelMichael

Administrator
Staff member
Apr 11, 2011
47,913
2,201
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Thank you for pointing that out. In the past, there was an entire section on that document devoted to IPv6. It has since been removed because it's not supported at this time.

Were you able to create the record successfully using the manual instructions provided on this thread?

Thank you.
 

Nick57

Well-Known Member
Jul 19, 2005
102
0
166
cPanel Access Level
Root Administrator
Hi, yes able to create the zone file, but working, no, this is really frustrating, cPanel is so far behind the facts, many customers want IPv6.
 

cPanelMichael

Administrator
Staff member
Apr 11, 2011
47,913
2,201
363
Hi, yes able to create the zone file, but working, no, this is really frustrating, cPanel is so far behind the facts, many customers want IPv6.
Could you open a support ticket using the link in my signature so we can review the entries you created and determine why they are not working? You can post the ticket number here so we can update this thread with the outcome.

Thank you.