[Snort-users] Best practices for setting HOME_NET

Kevin Ross kevross33 at ...14012...
Fri Jan 11 13:34:34 EST 2013


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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