Re: newbie question about $HOME_NET

["Daniel Qian" <daniel.qian () supracanada com>]

Perhaps I did not make it clear. What I really want to detect is for those traffic between my network and the Internet, 
 and in both direction

A lot of times when a host is compromised it will be made to attach other people on the Internet and I want to detect 
this kind of activities as well. For traffic between my own hosts I am thinking to set up another snort box tapping on 
the inside VLAN protected by my Cisco ASA firewall. The Cisco ASA currently has an IPS module to protect that VLAN from 
outside.

Thanks,
Daniel

  ----- Original Message ----- 
  From: JJ Cummings 
  To: Daniel Qian 
  Cc: snort-users () lists sourceforge net 
  Sent: Monday, October 05, 2009 10:33 AM
  Subject: Re: [Snort-users] newbie question about $HOME_NET


  In that case, you still want your $HOME_NET variable set to your network block that you are "protecting".  But you 
should set your $EXTERNAL_NET to any.. this will let you see internal attacks against internal hosts (of course this 
assumes that you have your SPAN session / TAP setup to see this internal traffic).


  On Mon, Oct 5, 2009 at 8:11 AM, Daniel Qian <daniel.qian () supracanada com> wrote:

    I am implementing Snort on our hosting network at the point where our two
    IPS links are connected - all traffic flowing on the two VLANs for ISPs are
    SPANed to the snort sniffing port.

    Some documents recommend setting $HOME_NET to my network block and a lot of
    detection rules actually have reference to this variable. The question is,
    if I want to detect bad traffic originating from a compromised host on my
    network should this variable be set to the default ANY? or is it common and
    proper way in this situation?

    Thanks in advance
    Daniel


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