Re: Unclear on active response MAC address

[Research <research () nativemethods com>]

On Mar 3, 2015, at 10:18 AM, Al Lewis (allewi) <allewi () cisco com> wrote:

> Hello,
>
> The manual also lists:
>
> "dst_mac will change response destination MAC address, if the device is eth0, eth1, eth2 etc.
> Otherwise, response destination MAC address is derived from packet."
>
>
> Think about it like this:
>
> Suppose you were sending the packet to a host on another segment. Or needed to reset from out a different 
> interface.... How would the traffic get to them? 
>
> When snort injects the packet  it will use the MAC from the packet as the return. But you can send the resets out of 
> another interface if need be as well. Some users "don't like" the idea of inline so they monitor on one interface in 
> passive mode then inject traffic out another interface. 
>
> Hope this helps.
>
>
>
> Albert Lewis
> QA Software Engineer
> SOURCEfire, Inc. now part of Cisco
> 9780 Patuxent Woods Drive
> Columbia, MD 21046 
> Phone: (office) 443.430.7112
> Email: allewi () cisco com

Hi Albert,

Ah, ok, the part about monitoring passively on one NIC and injecting on another makes sense to me.

Thanks for your reply.
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