C program to detect duplicate ip address if any after assigning ip address to ethernet interface

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LEARN ABOUT CENTOS

dhcp_release

DHCP_RELEASE(1) 					      General Commands Manual						   DHCP_RELEASE(1)

NAME

       dhcp_release - Release a DHCP lease on a the local dnsmasq DHCP server.

SYNOPSIS

       dhcp_release <interface> <address> <MAC address> <client_id>

DESCRIPTION

       A utility which forces the DHCP server running on this machine to release a DHCP lease.

       Send a DHCPRELEASE message via the specified interface to tell the local DHCP server to delete a particular lease.

       The  interface  argument  is  the interface in which a DHCP request _would_ be received if it was coming from the client, rather than being
       faked up here.

       The address argument is a dotted-quad IP addresses and mandatory.

       The MAC address is colon separated hex, and is mandatory. It may be prefixed by an address-type byte followed by -, eg

       10-11:22:33:44:55:66

       but if the address-type byte is missing it is assumed to be 1, the type for ethernet. This encoding is the one used in dnsmasq lease files.

       The client-id is optional. If it is "*" then it treated as being missing.

NOTES

       MUST be run as root - will fail otherwise.

LIMITATIONS

       Only usable on IPv4 DHCP leases.

SEE ALSO

       dnsmasq(8)

AUTHOR

       This manual page was written by Simon Kelley <simon@thekelleys.org.uk>.

																   DHCP_RELEASE(1)

UNIX for Advanced & Expert Users