Re: 'nmap -S <src_addr>' does not use 'iproute2' alternate routing table

[starlight.2012q3 () binnacle cx]

At 01:55 PM 9/10/2012 -0700, David Fifield wrote:
> On Mon, Sep 10, 2012 at 04:47:43PM -0400, 
>
> I'm not sure what to do here, because in --send-ip
> mode (the default on Linux), Nmap just builds the
> packets and lets the kernel send them. Does
>       ncat -s 172.29.86.4 69.160.42.66 80
> also route over the wrong interface?

Curious.  I thought --send-eth was the default
when running as 'root'.

Anyway 

# nmap -e eth4 -S 172.29.86.4 --send-eth -Pn 69.160.42.66

Does send the packets out 'eth4', but it
sends the to the MAC address of 172.29.87.2
which is not present on the 'eth4' network
and is only present on the 'eth5' network'.
Therefore the packets go nowhere.

SO

My earlier suggestion for a command-line
option that forces the gateway applies
regardless.

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