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Once dhcpd (IPv4) is started, is there any way to check its internal pool status? e.g how many addresses are available?

I checked man(8) dhcpd, there's no signals/files available for that info.

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2 Answers 2

up vote 4 down vote accepted

On Ubuntu there is the file /var/lib/dhcp/dhcpd.leases, but it is rather verbose and you probably need a little script if you want more high level statistics. I am unaware of existing tools to do this.

There is a separate man page for this file man dhcpd.leases describing the database format.

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Thanks for the filename , on arch linux I find it was located at /var/state/dhcp/dhcpd.leases –  warl0ck May 27 '12 at 7:57
    
On X random linux distro, the location of the lease file is probably defined in the dhcpd.conf file. It might possibly use the compiled-in default though. The config file usually lives under /etc (although perhaps in a subdirectory; red hat puts it in /etc/dhcp/dhcpd.conf). –  Dan Pritts Jul 9 '13 at 16:12
    
@DanPritts The parameter is called lease-file-name in dhcpd.conf IIRC. –  jippie Jul 9 '13 at 17:37

Checking status of leases is easiest with analysis tool.

http://dhcpd-pools.sourceforge.net/

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