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What would cause netbios to "apparently" stop working even though ping works?

Posted on 2008-10-23
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Last Modified: 2013-11-25
This has me stumped.  I have two Netgear FVS318 VPN routers at two offices.  I have them configured to make a VPN connection both ways to connect the two networks via cable internet on either side.  Everything was working fine when suddenly it just stopped working.  I can ping either way and I can even remotely access either router configuration pages using their LAN IP addresses.  So at the network level everything is fine.  But I can no longer view network shares by windows NETBIOS names. (e.g. \\computername).

The connection dropped when I was trying to do a database syncronization process over the VPN connection.  That was the first time I've ever tried that and it was taking quite a long time.

What's even weirder is that I can browse some of the remote clients using \\"IP Address", but not all of them.

Netbios over IP is enabled on the VPN settings and I have not changed any settings since it was working before.

Any help is greatly appreciated.
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Question by:sideout92
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by:ChiefIT
ID: 22820298
Your ISP may be refusing traffic on those ports. The default protocol to network shares and printers these days is SMB on port 445. Some ISPs are blocking these because of the violations and vulnerabilities to these shares.

http://ourworld.compuserve.com/homepages/timothydevans/browse.htm
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ChiefIT earned 125 total points
ID: 22820359
Old school way
http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/Q_23652843.html

New school way is to get SMB shares going through the tunnel on port 445 and Netbios datagram port 137. Now some ISP's block port 445 due to the vulnerabilities of that data. Also, some routers are now encrypting port 445 to secure the shared traffic. So, this setup depends upon what is offered to you.
http://ourworld.compuserve.com/homepages/timothydevans/browse.htm
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Author Closing Comment

by:sideout92
ID: 31509546
Thanks for the feedback.  I'll check if my ISP made any changes to that effect.
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