Christopher,
Prabhakar's company is using NBT (NetBios Transport). NBT is routable
because TCP transports it!.
Netbios packets are transported via TCP or datagramed by UDP Ports 139.
Regards,
Craig
-----Original Message-----
From: Christopher J. Witter [SMTP:[EMAIL PROTECTED]]
Sent: Wednesday, April 07, 1999 12:16 PM
To: pdmallya
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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