ping of netbios name does not resolve to correct IP address

try adding the line
   192.168.1.6 ERP1
in the winxp client
    c:\WINDOWS\system32\drivers\etc\hosts

Do you have an internal DNS server? If so add its IP to the network adapter as the first DNS server rather than the ISP's DNS. If this is a 2000/2003 domain (you mentioned NT) you should only use your DNS server, and the ISP only added as a Forwarder in the server's DNS.

LMHosts is usually used for NetBIOS names as you have done. Hosts is usually for DNS names. Odd that it would loose that, unless you have antispyware that is overwriting the LMhosts and Hosts files.

eulac,  I don't think adding the line
   192.168.1.6 ERP1
in the winxp client
    c:\WINDOWS\system32\drivers\etc\hosts
will help.  Hosts is usually for DNS names.

RobWill,

I do use Spybot, but it did NOT overwrite my LMHosts file.  It still contains:  192.168.1.6 ERP1 #PRE.

From an earlier post of mine:
To check your LMHosts file entries are accepted at a command prompt enter
  nbtstat  -R
which will purge and reload the local name cache
then enter
  nbtstat  -c
to display the current name cache which should include your LMHosts file entries.
Note; the nbtstat "switches" R & c are case sensitive.
The names will only show up if you used the 'PRE' option, or if not, if you have used the name with a ping or similar command enabling them to be cached

There are a few oddities with the file, have a look at the following:
-Lmhosts file is useful for NetBIOS name resolution where other solutions are not available.
-LMHosts is located in the Windows directory under c:\Windows (or WINNT)\System32\Drivers\Etc\LMHosts.sam , instructions are included within the file. Any line starting with # is just a comment and is ignored. Open the file with Notepad and add entries for your computers as below;
192.168.0.101      CompName       #PRE
-Hit enter when each line is complete (important), then save the file without a file extension. To be sure there is no extension ,when saving enclose in quotations like "LMHosts".
-PRE has to be capitalized, however you do not need it, though should give you faster resolution where it is "pre-loaded"
-use a Tab between entries in a line rather than spaces (recommended but not necessary)
-if adding the domain and or domain controller the # of spaces used is even critical. See:
http://support.microsoft.com/kb/q180094/

RobWill,  I ran your commands.  Here are the results of nbtstat -c

Local Area Connection 2:
Node IpAddress: [192.168.1.101] Scope Id: []

                  NetBIOS Remote Cache Name Table

        Name              Type       Host Address    Life [sec]
    ------------------------------------------------------------
    DB02           <00>  UNIQUE          192.168.1.2         2
    ERP1           <03>  UNIQUE          192.168.1.6         -1
    ERP1           <00>  UNIQUE          192.168.1.6         -1
    ERP1           <20>  UNIQUE          192.168.1.6         -1
    SDP            <1C>  GROUP           192.168.1.2         600

I can see ERP1 but when I ping it it still resolves to a 65.x.x.x.
Any ideas?

Thanks yeller. I hope you were able to get it sorted.
Cheers !
--Rob