Unix & Linux: Command to list assigned dhcp addresses (6 Solutions!!)
Unix & Linux: Command to list assigned dhcp addresses
The Question: Is there a command I can use to ask the dhcpd server which addresses have been
assigned?
Solutions: Please watch the whole video to see all solutions, in order of how many people found them helpful
== This solution helped 21 people ==
No, you can only get this information server side from the DHCP server. This
information is contained in the DHCP server’s .lease file: /var/lib/dhcpd/
dhcpd.leases, if you’re using ISC’s DHCP server.
**** Example ****
$ more /var/lib/dhcpd/dhcpd.leases
# All times in this file are in UTC (GMT), not your local timezone. This is
# not a bug, so please don’t ask about it. There is no portable way to
# store leases in the local timezone, so please don’t request this as a
# feature. If this is inconvenient or confusing to you, we sincerely
# apologize. Seriously, though – don’t ask.
# The format of this file is documented in the dhcpd.leases(5) manual page.
# This lease file was written by isc-dhcp-V3.0.5-RedHat
lease 192.168.1.100 {
starts 4 2011/09/22 20:27:28;
ends 1 2011/09/26 20:27:28;
tstp 1 2011/09/26 20:27:28;
binding state free;
hardware ethernet 00:1b:77:93:a1:69;
uid “001000033w223241i”;
}
…
…
== This solution helped 9 people ==
egrep command can be used to get an output:
egrep “lease|hostname|hardware|}” /var/lib/dhcpd/dhcpd.leases
Output:
lease 192.168.11.10 {
hardware ethernet 20:6a:8a:55:19:0a;
client-hostname “Maryam-PC”;
}
lease 192.168.11.7 {
hardware ethernet 00:16:ea:51:d3:12;
client-hostname “parsoon”;
}
lease 192.168.11.3 {
hardware ethernet 00:17:c4:3f:84:e3;
client-hostname “zahra-ubuntu”;
}
lease 192.168.11.5 {
hardware ethernet 58:b0:35:f1:31:2f;
}
== This solution helped 23 people ==
isc-dhcpd package version 4.3.1 has this command to list leases:
dhcp-lease-list –lease PATH_TO_LEASE_FILE
This is a simple perl script script that also supports older DHCP releases. You
can see a copy in the http://sources.debian.net/src/isc-dhcp/4.3.3-5/contrib/
dhcp-lease-list.pl/ or in the official_DHCP_distribution (in contrib/) as well.
The output is pretty:
$ perl contrib/dhcp-lease-list.pl –lease /var/db/dhcpd/dhcpd.leases
To get manufacturer names please download http://standards.ieee.org/regauth/
oui/oui.txt to /usr/local/etc/oui.txt
MAC IP hostname valid until
manufacturer
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by Roel Van de Paar
linux dhcp server
