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Top Forums UNIX for Beginners Questions & Answers DHCP Issue Possibly due to Hardware Clock? Post 303005095 by Scott on Thursday 12th of October 2017 04:00:46 PM
Old 10-12-2017
You could use a @reboot cron job to read the date at boot time, but of course that's only effective when the cron daemon is started, and you need something else to write the file before shutting down.

As you want to tightly couple it to the DHCP daemon as much as possible, not a great solution, but is modifying the dhcpd start / stop script an option? You could also just run ntp to update the time before it starts the DHCP daemon.

Changing the order services start in could be another option, but there's no guarantee that ntdp will update the time before it gets to dhcpd.

(edit, after Bakunin's reply): I presume also that assigning static address(es) to the client(s) is not an option?

Last edited by Scott; 10-12-2017 at 05:15 PM.. Reason: edit
This User Gave Thanks to Scott For This Post:
 

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dhcp(5) 						Standards, Environments, and Macros						   dhcp(5)

NAME
dhcp - Dynamic Host Configuration Protocol DESCRIPTION
Dynamic Host Configuration Protocol (DHCP) enables host systems in a TCP/IP network to be configured automatically for the network as they boot. DHCP uses a client/server mechanism: servers store configuration information for clients, and provide that information upon a client's request. The information can include the client's IP address and information about network services available to the client. This manual page provides a brief summary of the Solaris DHCP implementation. Solaris DHCP Client The Solaris DHCP client is implemented as background daemon, dhcpagent(1M). This daemon is started automatically during bootup if there exists at least one dhcp.interface file in /etc. Only interfaces with a corresponding /etc/dhcp.interface file are automatically configured during boot. Network parameters needed for system configuration during bootup are extracted from the information recieved by the daemon through the use of the dhcpinfo(1) command. The daemon's default behavior can be altered by changing the tunables in the /etc/default/dhc- pagent file. The daemon is controlled by the ifconfig(1M) utility. Check the status of the daemon using the netstat(1M) and ifconfig(1M) commands. Solaris DHCP Server The Solaris DHCP server is implemented as a background daemon, in.dhcpd(1M). This daemon can deliver network configuration information to either BOOTP or DHCP clients. The Solaris DHCP service can be managed using the dhcpmgr(1M) GUI or the command line utilities dhcpcon- fig(1M), dhtadm(1M), and pntadm(1M). DHCP Configuration Tables The Solaris DHCP server stores client configuration information in the following two types of tables: dhcptab tables Contain macros and options (also known as symbols), used to construct a package of configuration information to send to each DHCP client. There exists only one dhcptab for the DHCP service. The dhcptab(4) can be viewed and mod- ified using the dhtadm(1M) command or dhcpmgr(1M) graphical utility. See dhcptab(4) for more information about the syntax of dhcptab records. See dhcp_inittab(4) for more information about the DHCP options and symbols. DHCP network tables DHCP network tables, which contain mappings of client IDs to IP addresses and parameters associated with those addresses. Network tables are named with the IP address of the network, and can be created, viewed, and modified using the pntadm command or dhcpmgr graphical utility. See dhcp_network(4) for more information about network tables. SEE ALSO
dhcpinfo(1), dhcpagent(1M), dhcpconfig(1M), dhcpmgr(1M), dhtadm(1M), ifconfig(1M), in.dhcpd(1M), netstat(1M), pntadm(1M), syslog(3C), dhcp_network(4), dhcptab(4), dhcpsvc.conf(4), dhcp_inittab(4), dhcp_modules(5) Solaris DHCP Service Developer's Guide Alexander, S., and R. Droms. RFC 2132, DHCP Options and BOOTP Vendor Extensions. Silicon Graphics, Inc. Bucknell University. March 1997. Droms, R. RFC 1534, Interoperation Between DHCP and BOOTP. Bucknell University. October 1993. Droms, R. RFC 2131, Dynamic Host Configuration Protocol. Bucknell University. March 1997. Wimer, W. RFC 1542, Clarifications and Extensions for the Bootstrap Protocol. Carnegie Mellon University. October 1993. SunOS 5.10 13 Mar 2001 dhcp(5)
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