Clarissa is an attempt at replacing Pamela's scanner with something that does not rely on scanning the entire network every so often.
The design goals are an ability to run quietly (without sending out packets at all), have better time resolution (arp-scan can trigger rate limiting) and make the output available locally.
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Running quietly imposes a practical minimum timeout of the longest time between packets from any device you want to keep track of.
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Better time resolution can be obtained by nagging devices.
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The output is a unix domain socket (
/var/run/clar/[interface]_[subnet]-[mask]by default).
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When a MAC address is found in a frame on the listen interface, it is saved along with a timestamp as an entry in an internal list.
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If this entry is already on the list, the timestamp is updated.
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Clarissa uses their timestamp and a set timeout to determine when to nag entries.
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When an entry has been nagged a set number of times, it is removed from the list on the next interval.
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If an IPv4 or v6 address was found, an entry gets nagged via ARP or NDP respectively.
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The latest packages may be found here.