Unless I'm mistaken or I've misinterpreted your post, NetBios over TCP (or
NBT as it's referred to) is passed via:
UDP port 137, which is used for nbname
UDP port 138, which is used for nbdatagram
TCP port 139, which is used for nbsession
Best Regards, Donald Kelloway
http://www.commodon.com
-----Original Message-----
From: Newlander, Craig (BAI-Wabash) <[EMAIL PROTECTED]>
To: 'Christopher J. Witter' <[EMAIL PROTECTED]>; pdmallya
<[EMAIL PROTECTED]>
Cc: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Thursday, April 08, 1999 12:36 PM
Subject: RE: Netbios
>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
> >
> >
> > -
> > [To unsubscribe, send mail to [EMAIL PROTECTED] with
> > "unsubscribe firewalls" in the body of the message.]
> >
>
> -
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>-
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