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facha
Asked: 2011-03-05 04:42:11 +0800 CST

ISC DHCP server: how many IPs are in use?

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I'm wondering what is the correct way to count how many IPs are in use in my network according to the dhcpd process.

Is it just a matter of counting "binding state active" lines in dhcpd.leases file? Or it is something more complicated?

Thanks in advance.

dhcp isc-dhcp

3 Answers

  1. You could use ReportDHCP which parses your dhcp.leases file and provides you with a report that should give you what you are looking for.

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  2. dhcpd-pools is probably what you want.

    Example: dhcpd-pools -c 'path-to-dhcpd.config' -l 'path-to-lease-file' -L11 -sp -r

    Explanation: It prints 'Range Headers' and 'Ranges' with '-L11' and then sorts recursively on 'percent' with '-sp -r'

    Man page: http://dhcpd-pools.sourceforge.net/man.html

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  3. use at the command-line: Netsh dhcp server scope 192.168.1.0 show clients

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