dhcpd won't let go of old leases

Posted by Jakobud on Server Fault See other posts from Server Fault or by Jakobud
Published on 2010-06-14T21:49:40Z Indexed on 2010/06/14 21:53 UTC
Read the original article Hit count: 428

Filed under:

isc-dhcpd

We have DHCP setup to hand out leases in the following range:

192.168.10.190 - 192.168.10.254 (roughly 65 leases)

Our small business network only has about 30 computers that use DHCP. We noticed that dhcpd stopped handing out new dynamic leases to the computers, even though there are definitely not 65 computers on the network.

Why has it stopped handing out leases? Is it not releasing old un-used leases? How do we tell dhcpd to let go of old leases and start handing out fresh ones again?

Related posts about isc-dhcpd

When does ISC dhcpd expire leases

as seen on Server Fault - Search for 'Server Fault'
When exactly does ISC dhcpd forget a lease that is not explicitly freed by the client? Context: I am running an installation with many small pools (3 address) and it does not seem to cope well when all three leases are taken. Nevertheless I see entries in dhcpd.leases-file whose end date has passed… >>> More
ISC DHCPD IPv6 for multiple interfaces

as seen on Server Fault - Search for 'Server Fault'
I want to assign multiple IPv6 to a server with multiple NIC. As IPv6 RFC defines, each server has a unique DUID that can have one of the 3 formats (LL, LLT or enterprise). And each NIC has an IAID. So a request from NIC1 its the DUID and the IAID of the NIC1 and the request from NIC2 its the same… >>> More
Audit reserved IPs for UNIX/Linux ISC-DHCP

as seen on Server Fault - Search for 'Server Fault'
Are there any good FOSS tools to do an audit of reserved IPs used in a Linux/UNIX ISC DHCPd environment? I'm trying to ensure that we do not have stale IP addresses reserved when old MAC addresses are pulled. >>> More
Accessing DHCP Client's vendor-encapsulated-options

as seen on Server Fault - Search for 'Server Fault'
In the dhcpd.conf file for isc-dhcpd-V3.1.1, I have set up a vendor options space and defined several different options. I am able to use those definitions to send options from the server to the client in the vendor-encapsulated-options option (code 43). However, the client is also sending vendor… >>> More
Can ISC dhcpd operate as a proxy dhcp server for PXE boot?

as seen on Server Fault - Search for 'Server Fault'
I have an existing LAN with a DHCP server already dishing out IP addresses. For various reasons I cannot replace that server so it will still need to dish out IP addresses. I've been experimenting with dnsmasq in proxy mode to provide PXE boot filenames. Now I have dnsmasq chainloading iPXE ok,… >>> More

Developer IT

dhcpd won't let go of old leases - Developer IT

dhcpd won't let go of old leases

isc-dhcpd

Related posts about isc-dhcpd

When does ISC dhcpd expire leases

ISC DHCPD IPv6 for multiple interfaces

Audit reserved IPs for UNIX/Linux ISC-DHCP

Accessing DHCP Client's vendor-encapsulated-options

Can ISC dhcpd operate as a proxy dhcp server for PXE boot?

Categories cloud