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8.6

nbtstat -C gives me strange IPs...normal?

Asked by 8mathieu8 in Windows Network Security

Tags: jspnrmptgsbssdi

If I do a nbtstat -C on my pdc, it'll give me

              NetBIOS Remote Cache Name Table

    Name                  Type                   Host Address          Life [sec]
------------------------------------------------------------
218.106.114.212     <00>  UNIQUE     218.106.114.212     420
222.47.94.18          <00>  UNIQUE      222.47.94.18          540
MS-100                  <00>  UNIQUE      10.0.0.246              300
JSPNRMPTGSBSSDI<52>   UNIQUE      10.0.0.2                  -1
DDP3G741             <00>   UNIQUE      10.0.0.244              240
MTLACCOUNTING  <03>   UNIQUE      10.0.0.3                 540
RECKZIEGELK         <03>   UNIQUE      10.0.0.247             300


I noticed a entry for JSPNRMPTGSBSSDI for the 10.0.0.2 IP address in the lmhosts file with a #PRE flag.  If I look at the modified date, it is a long time ago when the network was built and I was not the administrator of this network.  Why would the old guy put a strange name-to-IP like that?...for testing? 10.0.0.2 is the IP address of my PDC, which has another name.

I don't know were 218.106.114.212 and 222.47.94.18 comes from though.  All other name are fine, they are client/server names in my network.

Is it normal to see outside IPs in the cache?  In what situation would I see that?

My server is configured as an Exchange 5.5 serer, proxy server, dns server file/print server... I know, it is not good to have all the services in there, but this is a Small Business version of NT.
It was also upgraded to Terminal Server Edition... the terminal services are obviously disabled because it was not secure.

In my firewall logs, I can see that requests on port 25 (SMTP) are made throught the day for those 2 external IP... so my mail server connects to their mail server on port 25. I know that my users don't send messages in the night.

I did a WhoIs on those IPs and it gives me something that is located in China for both...

Makes me think that it is a Spam problem... but again, my mail server is not open relay.

Hope you can clarify things for me!!!
[+][-]05/11/04 02:29 PM, ID: 11044864Accepted Solution

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Zone: Windows Network Security
Tags: jspnrmptgsbssdi
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Solution Provided By: trywaredk
Participating Experts: 2
Solution Grade: A
 
[+][-]05/11/04 02:27 PM, ID: 11044853Expert Comment

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