[Tutor] get a list of all IPs on a lan

[Allyn Weaks]

On 27/5/2004, Marco wrote:

>> Ping the broadcast address and see who answers?
>
>Not "everybody" answers to broadcasts, usually even "lightly"
>firewalled machines avoid answering to some ICMP types.

On unix, if you have root access and can turn on promiscuous mode, and
if you aren't isolated behind a switch, install the excellent arpwatch.
It watches all traffic across the network card, collects pairs of IP vs
MAC address and logs it. On a complex enough network, it's worth
analyzing the log with a python script...
-- 
Allyn Weaks    allyn at tardigrade.net   Seattle, WA  Sunset zone 5
Pacific NW Native Wildlife Gardening: http://www.tardigrade.org/natives/
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