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Old 23rd July 2008, 15:00
cstanciu cstanciu is offline
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Default BGP company: Reverse PTR records created with the same domain name

I configured for my company , a BGP protocol since we have our own block of IP addresses from ARIN, so now I have to register the PTR records for all my clients into my own DNS servers. I installed Centos5.2 with ISPConfig and I noticed that for two different zones like hypertec.ca and ciara-us.com that have records in the same subnet like 208.92.134.0 , the reverse zone automatically generated by ISPConfig is setting all the PTR records with the same domain name

If I put in the DNS Manager the SOA entry for two domains with two different IPs The Reverse zone file like "pri.134.92.208.in-addr.arpa" still has the PTRs with the right hostnames but with the same domain name.


In the following samples I have pc1.ciara-us.com with 208.92.134.15 and at a nslookup 208.92.134.15 the result is pc1.hypertec.ca which is wrong:

[root@ns1 named]# nslookup pc1.ciara-us.com
Server: 208.92.134.18
Address: 208.92.134.18#53
Name: pc1.ciara-us.com
Address: 208.92.134.15

[root@ns1 named]# nslookup 208.92.134.15
Server: 208.92.134.18
Address: 208.92.134.18#53
15.134.92.208.in-addr.arpa name = pc1.hypertec.ca.


The Real problem is with the MX records that need a PTR record with same name as in the MX records and ISPConfig seems to not generate the correct PTR records




Here is a config sample:

[root@ns1 named]# more pri.ciara-us.com
$TTL 3600
@ IN SOA ns1.hypertec.ca. postmaster.hypertec.ca. (
2008072205 ; serial, todays date + todays serial #
10 ; refresh, seconds
600 ; retry, seconds
86400 ; expire, seconds
3600 ) ; minimum, seconds
;
NS ns1.hypertec.ca. ; Inet Address of name
NS ns2.hypertec.ca. ; Inet Address of name

MX 10 mail.clients-ciara.com.

ciara-us.com. A 208.92.134.18
pc1 A 208.92.134.15
www A 209.104.84.250

;;;; MAKE MANUAL ENTRIES BELOW THIS LINE! ;;;;




[root@ns1 named]# more pri.hypertec.ca
$TTL 3600
@ IN SOA ns1.hypertec.ca. postmaster.hypertec.ca. (
2008071804 ; serial, todays date + todays serial #
900 ; refresh, seconds
600 ; retry, seconds
86400 ; expire, seconds
3600 ) ; minimum, seconds
;
NS ns1.hypertec.ca. ; Inet Address of name
NS ns2.hypertec.ca. ; Inet Address of name

hypertec.ca. A 208.92.134.18
ns2 A 208.92.134.19
ns1 A 208.92.134.18




[root@ns1 named]# more pri.example.com
$TTL 3600
@ IN SOA ns1.hypertec.ca. postmaster.hypertec.ca. (
2008071802 ; serial, todays date + todays serial #
10 ; refresh, seconds
600 ; retry, seconds
86400 ; expire, seconds
3600 ) ; minimum, seconds
;
NS ns1.hypertec.ca. ; Inet Address of name
NS ns2.hypertec.ca. ; Inet Address of n

MX 10 mail.clients-ciara.com.

example.com. A 208.92.134.18
hypertec-it A 208.92.134.10



[root@ns1 named]# more pri.134.92.208.in-addr.arpa
$TTL 86400
@ IN SOA ns1.hypertec.ca. hostmaster.hypertec.ca. (
2008072201 ; serial, todays date + todays
serial #
28800 ; Refresh
7200 ; Retry
604800 ; Expire
86400) ; Minimum TTL
NS ns1.hypertec.ca.
NS ns2.hypertec.ca.
18 PTR hypertec.ca.
19 PTR ns2.hypertec.ca.
15 PTR pc1.hypertec.ca.
10 PTR hypertec-it.hypertec.ca.

;;;; MAKE MANUAL ENTRIES BELOW THIS LINE! ;;;;



Please help, if there is a posibility
I was looking into the file reverse_zone.in-addr.arpa.master file to figure it out but there is only one Variable there.



thanks
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