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Special Forums IP Networking DHCP client's IP release query Post 302693067 by Corona688 on Tuesday 28th of August 2012 02:17:36 PM
Old 08-28-2012
Quote:
Originally Posted by satish51392111
1. If a new client comes up and it needs an IP to be assigned by a DHCP server, how can it communicate with the DHCP server in the first case without any IP? The SUN doc says something about "BOOTP" agent but could not understand it. Can anyone enlighten me here??
Remember that ethernet can carry more than one kind of protocol; in the end it's just another level of frame. You can still broadcast without an IP, using your MAC address. The DHCP server can broadcast back.
Quote:
2. What would happen if the client was shutting down and it sent a 'IP release request' (to the DHCP server which provided its IP) but the DHCP server in question was unavailable?
Then the DHCP server wouldn't get the message, and would consider the IP to still be occupied.

Eventually it would time out, not being renewed, and be considered free again by the DHCP server, and possibly given to someone else should a request be made.
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dhcpmgr(1M)						  System Administration Commands					       dhcpmgr(1M)

NAME
dhcpmgr - graphical interface for managing DHCP service SYNOPSIS
/usr/sadm/admin/bin/dhcpmgr DESCRIPTION
dhcpmgr is a graphical user interface which enables you to manage the Dynamic Host Configuration Protocol (DHCP) service on the local sys- tem. It performs the functions of the dhcpconfig, dhtadm, and pntadm command line utilities. You must be root to use dhcpmgr. The dhcpmgr Help, available from the Help menu, contains detailed information about using the tool. USAGE
You can perform the following tasks using dhcpmgr: Configure DHCP service Use dhcpmgr to configure the DHCP daemon as a DHCP server, and select the data store to use for storing network configuration tables.. Configure BOOTP relay service Use dhcpmgr to configure the DHCP daemon as a BOOTP relay. Manage DHCP or BOOTP relay service Use dhcpmgr to start, stop, enable, disable or unconfigure the DHCP service or BOOTP relay service, or change DHCP server parameters. Manage DHCP addresses Use dhcpmgr to add, modify, or delete IP addresses leased by the DHCP service. Manage DHCP macros Use dhcpmgr to add, modify or delete macros used to supply configuration parameters to DHCP clients. Manage DHCP options Use dhcpmgr to add, modify or delete options used to define parameters deliverable through DHCP. Convert to a new DHCP data store Use dhcpmgr to configure the DHCP server to use a different data store, and convert the DHCP data to the format used by the new data store. Move DHCP data to another server Use dhcpmgr to export data from one Solaris DHCP server and import data onto another Solaris DHCP server. EXIT STATUS
The following exit values are returned: 0 Successful completion. non-zero An error occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWdhcm | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ SEE ALSO
dhcpconfig(1M), dhtadm(1M), pntadm(1M), in.dhcpd(1M), dhcpsvc.conf(4), dhcp_network(4), dhcptab(4), attributes(5), dhcp(5), dhcp_modules(5) Solaris DHCP Service Developer's Guide System Administration Guide: IP Services SunOS 5.10 13 Mar 2001 dhcpmgr(1M)
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