Re: securing a segment of a network

["Adam Pal" <pal_adam () gmx net>]

Hi Roger,

First point: what you described bellow is nice, but it is one special scenario. 
What is the most likely threat you want to mitigate? 
Try to keep in mind, that mitigating exitic threats can lead you to higher costs and that is what you wanted to avoid 
acording to your first email.
Also another question you can take in consideration: what would be your acceptable risks?

If the requirement is:
"Keep the same, maintain the accounting PCs unreachable from the other
PCs in the network."
then i read it as unreachable from the other PCs. 
A rule (ACL) can be applied on the respective PC which will deny all connections requests to it (inbound). 
That way you wont need to maintain 2 different domain controler while the requirement specifies PCs and not Servers. 

That way you can build your argumentation, if it doesnt help then you have no other choice than maintain 2 different 
networks or give up the business (as mentioned in the list)


Cheers,
Adam Pal

-------- Original-Nachricht --------
> Datum: Sun, 07 Mar 2010 09:37:55 +0000
> Von: Roger D Vargas <roger () ehtsc co cu>
> An: security-basics () securityfocus com
> Betreff: Re: securing a segment of a network

> Adam Pal escribió:
> > Hello Roger,
> >
> > What exactly was your security gain from physicaly split the network?
> >   
> That makes the acocutning PC inaccesible from the other network. In
> theory, if you gain access to the gateway PC (with 2 network cars, one
> for each network segment) you could do something, but that would take a
> very skilled guy who can break into a Linux server and get the info from
> Windows shares.
> > It would also help if you can specify what security requirement should
> > be satisfied.
> >   
>
> Keep the same, maintain the accounting PCs unreachable from the other
> PCs in the network.
>
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Securing Apache Web Server with thawte Digital Certificate
In this guide we examine the importance of Apache-SSL and who needs an SSL certificate.  We look at how SSL works, how 
it benefits your company and how your customers can tell if a site is secure. You will find out how to test, purchase, 
install and use a thawte Digital Certificate on your Apache web server. Throughout, best practices for set-up are 
highlighted to help you ensure efficient ongoing management of your encryption keys and digital certificates.

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