I am given to understand that NETBIOS is itself not a protocol at all.
NETBEUI is a very fast and efficient protocol, but it is not routable and
does not scale. For a small network like most small offices and small
businesses, this is one of the fastest protocols available. In order to be
able to scale and support backwards compatibility along comes NBT. This
protocol allows NETBIOS calls from workstations and servers to traverse a
network with more than one physical segment. Layer 3 devices will forward
NBT packets and you can also configure most layer 3 devices to forward
broadcast traffic for functions like DHCP and WINS.
In Cisco, this is the helper address when configuring IP interfaces.
Just MHO ...
Lance.
Lance Ecklesdafer, CNP
Senior Network Engineer
re:Sources, Inc.
[EMAIL PROTECTED]
http://members.tripod.com/ecklesd
"My God ... It's full of stars"
-----Original Message-----
From: Kafil Din <[EMAIL PROTECTED]>
To: Christopher J. Witter <[EMAIL PROTECTED]>
Cc: pdmallya <[EMAIL PROTECTED]>; [EMAIL PROTECTED]
<[EMAIL PROTECTED]>
Date: Thursday, April 08, 1999 12:22 AM
Subject: Re: Netbios
>
>
>
>NetBIOS itself certainly can't be routed but they will be using NBT which
>is NetBIOS encapsulated in IP. This certainly can be routed and is how
>they have been passing NetBIOS around on IP networks for years.
>
>If you are using NT DNS in the picture and have Enable DNS for WINS
>resolution turned on you can actually resolve NetBIOS names to IP
>addresses.
>
>Provided your firewal does not allow inbound connection and the
>userid/password used to connect to the external share is not one you use
>internally then you should not have an exposure.
>
>Kafil.
>
>
>
>
>
>"Christopher J. Witter" <[EMAIL PROTECTED]> on 08/04/99 03:16:27
>
>
>To: pdmallya <[EMAIL PROTECTED]>
>cc: [EMAIL PROTECTED]
>Subject: Re: Netbios
>
>
>
>
>Netbios can't be routed so unless you are using a VPN to bridge the two
>networks together than and they are then on the same IP subnet then this
>isn't possible.
>
>Christopher Witter
>MCSE, MCP +Internet, ICIS, IIAE
>
>Windows NT Crashed.
>I am the Blue Screen of Death.
>No one hears your screams.
>
>On Wed, 7 Apr 1999, pdmallya wrote:
>
>> Hi,
>>
>> A department in my company wants to permit PC's in our network to access
>> files in machines on an external network using Netbios file-sharing. I'm
>> being told that this does not open any loopholes in our security,
>because:
>> (a) we can connect our network to the external one using a Checkpoint
>> Firewall, with a rule permitting NBT connections from our internal PCs to
>> the external machines containing the files. There will be no rule
>permitting
>> a reverse connection.
>> (b) there will be no shared disks on our network, and the Checkpoint
>rules
>> will enforce this.
>> (c) ergo, our network is not exposed in any way.
>>
>> I am not quite convinced - can anyone give me some more information or
>> pointers on this?
>>
>> TIA & Regards
>>
>> Prabhakar D. Mallya
>>
>>
>> -
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>>
>
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