Alternate access mapping & Registry settings.

To configure alternate access mapping follow the below steps

-          Open Central Administration

-          Click on Configure Alternate Access mappings link on right navigation

Now click on Site URL for which you want to configure alternate access mapping.

You will see below screen. Here you need to enter the required name for the site to access and select zone that you want to in order to configure alternate access mapping.

If you have configured alternate access mapping then you also need to do following registry entries.

Refer :

 http://technet.microsoft.com/en-us/library/cc261814(office.12).aspx
 http://www.mssharepointtips.com/tip.asp?id=1102&page=2

There are 3 Registry settings:

 1)     BackConnectionHostNames

>Go to Run

>Type Regedit

>Path: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0

> Right-click MSV1_0, point to New, and then click Multi-String Value.

Type BackConnectionHostNames, and then press ENTER.

                Right-click BackConnectionHostNames and then click Modify.

  >In the Value data box, type the host name and then click OK.

eg: Host name manoj.

  >Quit Registry Editor

 2)     DisableLoopBackCheck

>Go to Run

>Type Regedit

>Path: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\

> Right-click Lsa, point to New, and then click DWORD Value.

Type DisableLoopBackCheck, and then press ENTER.

                Right-click DisableLoopBackCheck, and then click Modify.

  >In the Value data box, type 1, and then click OK.

  >Quit Registry Editor

  3)     DisableStrictNameChecking

>Go to Run

>Type Regedit

>Path: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanmanServer\Parameters

>Edit  menu, click Add Value, and then add the following registry value:

Value name: DisableStrictNameChecking
Data type: REG_DWORD
Value: 1

>Quit Registry Editor

Refer:
http://technet.microsoft.com/en-us/library/ff660057(v=ws.10).aspx
http://support.microsoft.com/kb/926642
http://www.harbar.net/archive/2010/02/12/groundhog-day-configuring-back-connection-host-names-using-group-policy.aspx
http://www.happysysadm.com/2011/11/setting-disablestrictnamechecking-in.html