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Article #537

Re: "Shields UP!" - Port 139 & NetBIOS

#537
From: John Underwood
Date: Sat, 12 Feb 2000 00:00
48 lines
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On Sat, 12 Feb 2000 at 00:08:23, Dave Mason <dave@lowjobs.co.uk> wrote
in demon.tech.pc:
(Reference: <Xv1p4.7268$uc.156137@nnrp4.clara.net>)

>On Fri, 11 Feb 2000 20:13:33 +0000, Andy Mabbett
><andy@pigsonthewing.demon.co.uk> wrote:
>
>>What do the panel think of the advice at:
>>
>>     http://grc.com/su-rebinding9x.htm
>>
>>about protecting Port 139
>
>Not much.
>
>I only use TCP/IP on my home network, the rest is not needed.
>Some people may disagree but it works for me. 'e' me if you want.
>
If you only use TCP/IP on your home network, how do you communicate with
the Internet which doesn't use anything else?

For those needing clarification on this point, if you run TCP/IP on your
home network, Steve Gibson's advice is irrelevant. You can unbind
sharing from your Dial-up Adapter, but you will still have NetBIOS
implemented on it.

There are limited circumstances in which you need to run TCP/IP on your
local network. In most cases, NetBEUI is more than adequate and is
Steve's recommendation - use that on your local network and unbind all
services from TCP/IP and you are pretty safe.

If you do have to share files across the Internet or have to use TCP/IP
on your local network [1], then you really need a decent Firewall to be
safe.

I realise that writing this is sticking my neck out into a new flame
war, but the author of this piece of advice is not only wrong, but has
yet to demonstrate any knowledge of the subject. Here his recommendation
is not only misleading but positively dangerous.

And no, Mason, I won't respond to a challenge from you to attack your
system and if you issue one and I don't respond it proves nothing other
than that you are an even bigger fool than you have appeared to be so
far in this group.

[1] I do, for example, in order to run Sygate.
-- 
John Underwood
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From: John Underwood <john@jsunderwood.demon.co.uk>
Subject: Re: "Shields UP!" - Port 139 & NetBIOS
Date: 2000/02/12
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