What is the exact meaning of "On Commit" in ISC DHCP server configuration?
by Elon20 from LinuxQuestions.org on (#5K2V3)
Hi everyone,
I know there are three kinds of events we can use for scripting in ISC dhcpd --> commit, expire and lease. My problem is, I am having a little problem in understanding the "commit" event. I know "commit" event means when the server has made a commitment of a certain lease to a client. But it would be easier to understand this in DORA context.
That means, when the Commit event will trigger ? Is it when the dhcpd is ready to offer a lease to a client? or after it has leased IP to a client?
For example, in the following configuration -
Code:on commit {
set ClientIP = binary-to-ascii(10, 8, ".", leased-address);
set ClientMac = binary-to-ascii(16, 8, ":", substring(hardware, 1, 6));
log(concat("Commit: IP: ", ClientIP, " Mac: ", ClientMac));
execute("/usr/sbin/test.py", "commit", ClientIP, ClientMac);
}when exactly will the test.py script will execute? Before the DHCP ACK packet exits from DHCP server or after DHCP ACK packet exits from DHCP server?
Thanks in advance. Cheers.
I know there are three kinds of events we can use for scripting in ISC dhcpd --> commit, expire and lease. My problem is, I am having a little problem in understanding the "commit" event. I know "commit" event means when the server has made a commitment of a certain lease to a client. But it would be easier to understand this in DORA context.
That means, when the Commit event will trigger ? Is it when the dhcpd is ready to offer a lease to a client? or after it has leased IP to a client?
For example, in the following configuration -
Code:on commit {
set ClientIP = binary-to-ascii(10, 8, ".", leased-address);
set ClientMac = binary-to-ascii(16, 8, ":", substring(hardware, 1, 6));
log(concat("Commit: IP: ", ClientIP, " Mac: ", ClientMac));
execute("/usr/sbin/test.py", "commit", ClientIP, ClientMac);
}when exactly will the test.py script will execute? Before the DHCP ACK packet exits from DHCP server or after DHCP ACK packet exits from DHCP server?
Thanks in advance. Cheers.