dhcp no free leases

brownwrap · 03-24-2015, 10:04 PM

I have seen this error here, and elsewhere. I tried deleting /var/lib/dhcpd/dhcpd.leases and restarting dhcpd, same problem. So I am hoping someone has a better set of eyes than I do.

Code:

Mar 24 19:47:50 tsui dhcpd: DHCPDISCOVER from f0:4d:a2:40:a0:5a via em1: network 10.1.1.0/24: no free leases
Mar 24 19:47:54 tsui dhcpd: DHCPDISCOVER from f0:4d:a2:40:a0:5a via em1: network 10.1.1.0/24: no free leases
Mar 24 19:48:02 tsui dhcpd: DHCPDISCOVER from f0:4d:a2:40:a0:5a via em1: network 10.1.1.0/24: no free leases
Mar 24 19:48:18 tsui dhcpd: DHCPDISCOVER from f0:4d:a2:40:a0:5a via em1: network 10.1.1.0/24: no free leases
Mar 24 19:48:50 tsui dhcpd: DHCPDISCOVER from f0:4d:a2:40:a0:5a via em1: network 10.1.1.0/24: no free leases

Code:

[root@tsui dhcp]# more /etc/dhcp/dhcpd.conf
ddns-update-style none;
subnet 10.1.1.0 netmask 255.255.255.0 {
	default-lease-time 1200;
	max-lease-time 1200;
	option routers 10.1.1.1;
	option subnet-mask 255.255.255.0;
	option domain-name "local";
	option domain-name-servers 10.1.1.1;
	option broadcast-address 10.1.1.255;
	option interface-mtu 1500;
	group "local" {
		host tsui-em1 {
			hardware ethernet F0:4D:A2:40:9B:26;
			option host-name "tsui";
			fixed-address 10.1.1.1;
			filename "pxelinux.0";
			next-server 10.1.1.1;
		}
	}
}

The address in the messages is from the machine I am trying to PXE boot. I have a Netgear8 port switch between the two machines. Pretty simple setup for testing, but even this isn't working. Maybe I missed something in the config file.

TenTenths · 03-25-2015, 03:04 AM

A quick looks shows that you have no range directive, so your dhcp server doesn't know what range of IPs to give out, so you'll never get one.

brownwrap · 03-25-2015, 12:28 PM

Giving it a range statement solved the problem, but we have several machines set up using ROCKS which installs a dhcp server. They are all working, and none have a range statement, but at least it offered the client an IP. Still, the client is not booting. On the client side I received:

No bootfile name received

Installing the head node, which has the dhcp server is all canned, so I don't know why I am having all these issues.

Kydd · 09-04-2016, 10:07 PM

We're having the same problem did you ever find a solution?

clsgis · 05-29-2017, 03:14 PM

@brownwrap (03-24-15) There are no free leases, because there are no ranges defined where they might apply.

You need a range statement inside each subnet{} block. EG

Code:

range 10.1.1.129 10.1.1.199;

Add that line following your max-lease-time line.

Notice the dhcpd.conf(5) manpage says "For any subnet on which addresses will be assigned dynamically, there must be at least one range statement." This is in ISC DHCPd which is the DHCP daemon in many open source distributions.

TenTenths · 05-30-2017, 04:36 AM

Quote:

Originally Posted by clsgis

@brownwrap (03-24-15) There are no free leases, because there are no ranges defined where they might apply.

lol, wow, congratulations on repeating the answer that was given 2 years ago and acknowledged by the OP!

clsgis · 06-01-2017, 10:59 AM

OP left out the part where the range declaration has to be inside the subnet block braces. I found seven different threads on Linuxquestions and the CentOS and Ubuntu forums where people were asking about that same error message and getting no answer. About half of them had no range statement at all, and the other half had the range statement outside the braces where it no longer has any effect.