You are not authoritative for that IP. Reverse addresses screw many people up. BIND ships in most distros with it prepared to give reverse answers, but the vast majority of public sites don't get to do their own reverse mappings. You can map a private network in reverse as you are authoritative for it, but just because you are given a public IP address doesn't make you authoritative for it. You generally need a full class C of public addresses (256 total addresses) before you can do reverse mappings for the public internet.
It works when you query on the LAN because you are the first DNS queried from the LAN. If you told your DNS server you're authoritative for google.co.uk (which you aren't), it would answer, although nobody outside of your LAN would ask you for google.co.uk addresses.
Here is who actually is responsible for the IP address in question -
Code:
jim@jimsworktop:~$ whois 89.106.176.158
% This is the RIPE Whois query server #2.
% The objects are in RPSL format.
%
% Rights restricted by copyright.
% See http://www.ripe.net/db/copyright.html
% Note: This output has been filtered.
% To receive output for a database update, use the "-B" flag
% Information related to '89.106.176.0 - 89.106.183.255'
inetnum: 89.106.176.0 - 89.106.183.255
netname: UK-ILAND-20060405
descr: iland Internet Solutions Inc.
country: GB
org: ORG-iISI1-RIPE
admin-c: HRR25-RIPE
tech-c: NOC91-RIPE
status: ALLOCATED PA
mnt-by: RIPE-NCC-HM-MNT
mnt-lower: MNT-HRR25-RIPE
mnt-routes: MNT-HRR25-RIPE
mnt-domains: MNT-HRR25-RIPE
source: RIPE # Filtered
organisation: ORG-iISI1-RIPE
org-name: iland Internet Solutions Inc.
org-type: LIR
address: 7 PRIMROSE HILL
address: CM1 2RQ
address: CHELMSFORD, ESSEX
address: United Kingdom
phone: +442070960149
fax-no: +17138682268
admin-c: HRR25-RIPE
admin-c: BU161-RIPE
admin-c: NOC91-RIPE
mnt-ref: MNT-HRR25-RIPE
mnt-ref: RIPE-NCC-HM-MNT
mnt-by: RIPE-NCC-HM-MNT
source: RIPE # Filtered
role: Network Operations
address: 7 PRIMROSE HILL CHELMSFORD ESSEX CM1 2RQ UNITED KINGDOM
abuse-mailbox: abuse@iland.com
admin-c: HRR25-RIPE
tech-c: HRR25-RIPE
nic-hdl: NOC91-RIPE
source: RIPE # Filtered
person: Hermes Rubio
address: 7 PRIMROSE HILL CHELMSFORD ESSEX CM1 2RQ UNITED KINGDOM
abuse-mailbox: abuse@iland.com
phone: +442070960149
nic-hdl: HRR25-RIPE
source: RIPE # Filtered
So those guys control all the reverse mappings for the addresses 89.106.176.0 - 89.106.183.255. You'd have to have them create the PTR for you, or authorize your server to answer authoritatively in reverse mappings for your IPs. I can promise you they won't do that. They have 8 class C addresses, and unless you had one of them in full, they won't forward PTR requests to you.
Peace,
JimBass
oh ye of little faith
