[nycbug-talk] Finding a device's IP address

[Marc Spitzer]

On Thu, Mar 19, 2009 at 6:52 PM, Charles Sprickman <spork at bway.net> wrote:
> Perhaps a bit OT, but a general question...
>
> You have a device on a network that you do not have physical access to.
> It has an IP address which may or may not be on the subnet it's actually
> attached to.
>
> How do you find what IP is configured?  What magic ARP stuff can you spew
> in it's direction that would perhaps make it respond with something that
> would give away it's IP?
>

1: show arp on the router, even if it is misconfigured, ie wrong
subnet. , the ip should still be in the arp table

2: broadcast ping, ie ping 255.255.255.255  and then run arp befor
everything times out.  or capture w/tcpdump and look at later

marc

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