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Is there a tool or something that can notify me whenever a local IP goes live on my network.

It could be that it continually ping that IP and display a notification to me whenever that IP return a packet.

I'm a programmer myself and I can write such a tool myself without a problem, but if there exist such a tool already that would be great (even if it is a command line tool)

Best Regards,

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What operating system? – Sven Apr 16 '11 at 17:19

If your network uses DHCP you may try arpwatch and filter for the specific MAC address of the host you're looking for.

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Arpwatch can be setup to automatically send an email when a new ip/mac address is seen on the network. As it's name suggests, it monitors arp requests so it should work in non-DHCP environments also. – kband Apr 17 '11 at 3:22

Smokeping probably does what you're looking for.

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You can try Zabbix! It's a tool that has many features including host ping and network discovery

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