Frequently Asked Questions - DHCP
DHCP Frequently asked questions
Configuration and Setup Questions
Yes; if you're using the concat() syntax, the additional option
numbers are represented in hex.
This is because of the way that dhcpd.conf is parsed. As an example
17,18 would get options 23 (default-ip-ttl) and 24
(path-mtu-aging-timeout).
At this time, the dhcpd server doesn't have any reload mechanism. It doesn't handle HUP signal nor have a 'soft' reconfiguration method. The server has to be stopped and restarted, for example:
kill `cat /var/run/dhcpd.pid`
/usr/local/sbin/dhcpd
If you have a startup script for dhcpd, you may be able to reload the configuration (by restarting) such as:
/etc/init.d/dhcpd restart
Depending on the use, this is usually not a problem in terms of service outages because clients retransmit and it is hard for anyone to notice a problem in the time it takes the server to start back up again.
Operating System Specific Questions
AIX
The ISC DHCP distribution does not include a dhclient-script for AIX--
AIX comes with a DHCP client. Contribution of a working dhclient-script
for AIX would be welcome.
Please see this page for actual Links
Documentation for the ISC DHCP software includes the README file, the RELNOTES file, and the manual pages. The README file includes late-breaking operational and system-specific information that you should read even if you don't want to read the manual pages, and that you should *certainly* read if you run into trouble. Internet standards relating to the DHCP protocol are stored in the doc subdirectory (included with the source). You will have the best luck reading the manual pages if you build this software and then install it, although you can read them directly out of the distribution if you need to.
DHCP server documentation is in the dhcpd man page. Information about the DHCP server lease database is in the dhcpd.leases man page. Server configuration documentation is in the dhcpd.conf man page as well as the dhcp-options man page. A sample DHCP server configuration is in the file server/dhcpd.conf (in the source).
DHCP Client documentation is in the dhclient man page. DHCP client configuration documentation is in the dhclient.conf man page and the dhcp-options man page. The DHCP client configuration script is documented in the dhclient-script man page. The format of the DHCP client lease database is documented in the dhclient.leases man page. In addition, the dhcp-options man page should be referred to for information about DHCP options.
DHCP relay agent documentation is in the dhcrelay man page.
To read installed manual pages, use the man command. Type "man page" where page is the name of the manual page.
