Thursday, October 17, 2013

Mac OS X (all ver) has issues with DNS resolution IPv6 with SBS-2008

Some time back, the SBS-2008 my client has in their office is causing some DNS resolution issues with IPv6 reverse lookup. As such, some times the MAC OS X'es are unable to resolve DNS entries to get connected to the mail server.

A work-around my colleague gave was to set-up VPN connection as PPTP VPN using RAS gives out a separate IPv4 address, and is able to resolve IPv4 DNS requests without using the IPv6. 

While this is an easy work-around, the easier method is to simply set-up hosts file to perform the mapping.

Unfortunately for him, he was unable to locate the hosts file to edit in the mac os X. I did some search in the web and encounter this blog post... (here) I don't wish to re-invent the wheel, but I thought I'll post it here anyway, with some pictures to guide my readers and my team how to make the changes.

Follow my print-screens below. It should be self-explanatory.







just press CTRL+o (Omega) to save.

press Enter to save the changes.


You are good to go! 

Now for the biggie.. the server needs to be fixed with the IPv6 issue.

This is the issue:

I ensured that all settings are right:

After hunting through different blogs, i found one here and I realize this guy faced the similar problem and fixed the issue!

the mistake i made was to create 8.c.2.f.0 where I should have done it like this:
 Once added with an AAA record, the PTR can be added.
  
Resolution now works.. but the problem still persists!

Shucks! 
 




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