Monitoring DHCP usage

If you want to know what leases are active, and who are using them. There seems to be no utility for doing this. Instead, You have to manually look thru the '/var/lib/dhcpd/dhcpd.leases' file. But difficult to all pc monitor IP adress, status, mac address, and host name. which connect to dhcp ip.

Today I wrote the following script which will parse the dhcpd.leases file and create a single line of information for each IP address in the format like:

IP Addr                Status                 MAC                     Host Name
172.16.10.100      active        00:15:58:db:40:c9            "Linux20"
172.16.10.101       free          00:1c:25:c3:4d:0d             "Linux07"
172.16.10.102       free          00:16:e6:78:51:14             "Linux01"
172.16.10.103      active        00:e0:4c:73:05:24             "Linux98"
172.16.10.104       free          00:17:a4:13:bb:c1             "Linux71"

This tells you the status of each IP address. The current (or last) MAC address assigned, and a host name, if available.

Here is the script: [root@linux ~]# vim monitor_dhcp.sh