[Snort-users] Unclear on active response MAC address

Research research at ...17107...
Tue Mar 3 10:22:30 EST 2015


On Mar 3, 2015, at 10:18 AM, Al Lewis (allewi) <allewi at ...589...> 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 at ...589...

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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