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jamiegarland8

join:2003-01-09
34344

NETBIOS Routable?

I'm just wondering, all this talk about NETBIOS being a threat... Well even if it is open on your computer/network, surely NETBIOS isn't a routable protocol? So the outside world /internet will not be able to see it?

Any feedback would be great

Jamie


PhiBerOptiCx

@65.101.x.x
Although we are talking about Netbios, we are also discussing TCP IP port 139 (which in itself, is Netbios.) Even though Netbios is non-routable, you are able to get in using the Transmission Control Protocol.

devonshire

join:2004-05-19
bm
reply to jamiegarland8
said by jamiegarland8:
I'm just wondering, all this talk about NETBIOS being a threat... Well even if it is open on your computer/network, surely NETBIOS isn't a routable protocol? So the outside world /internet will not be able to see it?
NetBios is an overloaded term. NetBios the orignial protocol, operated at the DataLink, Network, Transport, and Session layers of the OSI stack. It was not routable.

Two new variants were created to solve that problem NBIPX (NetBios over IPX) and NBT (NetBios over TCP/IP). All of the Netbios services that were available Non-Routable are now available Routable. NBT hangs out on TCP/UDP Ports, 137,138, and 139 and are fully available on the Internet.

I have not tested XP, but as of NT4 NBT was so embedded in the Protocol stack there was no effective way of shutting it off.

USE A Firewall