[Snort-users] Best practices for setting HOME_NET

Mike Miller mike at ...16027...
Fri Jan 11 18:03:17 EST 2013


 Not necessarily. 

Your IDS won't alert on an internal range attacking another internal range. 

I've seen:

ipvar EXTERNAL_NET any

to be more expansive. 

On Jan 11, 2013, at 11:34 AM, Kevin Ross <kevross33 at ...14012...> wrote:

> It should be your internal network ranges or specifically the IPs or subnets you are trying to protect if you want to refine it further and consider even more to be "external". If you are really unsure you can set it as RFC 1918 addresses and then set EXTERNAL_NET to be anything not HOME_NET.
> 
> i.e
> ipvar HOME_NET [ 10.0.0.0/8,172.16.0.0/12, 192.168.1.0/16 ]
> ipvar EXTERNAL_NET !$HOME_NET
> 
> It is important to try and get this right so the rules are applied properly.
> 
> Hope that helps,
> Kevin
> 
> 
> On 11 January 2013 04:02, Craig Merchant <cmerchant at ...16022...> wrote:
> What are the best practices for setting the HOME_NET variable in an environment where multiple sensors exist at different sites or datacenters?  Is it considered best to set it to a network range that encompasses all of the sites, or generally is it considered best to treat intra-site traffic as external?
> 
>  
> 
> Thx.
> 
>  
> 
> Craig
> 
> 
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