Option 82 and dhcpd. "No free leases" for second computer

Posted by SaveTheRbtz on Server Fault See other posts from Server Fault or by SaveTheRbtz
Published on 2009-06-19T00:24:33Z Indexed on 2010/04/06 9:23 UTC
Read the original article Hit count: 658

Filed under:

freebsd

|

dhcp

|

isc-dhcpd

|

option82

There is DHCP server in network (isc-dhcpd-server-3.0 on FreeBSD 7.2) than gives one IP per switch port to every user via Option 82

The problem appears when user disconnects one of his computers and connects another(i.e notebook with different MAC address) then DHCPD puts to log "...network net1: no free leases", because there is record in leases file that this IP is already owned by another MAC. That second computer will have his IP only after default-lease-time (that is IIRC minimum 10min, and after 3min he usually calling support) or after deletion of dhcpd.leases file and restart of dhcpd.

Is there a way to turn leases off at all, because we have strict binding between switch-port-ip?

© Server Fault or respective owner

Related posts about freebsd

FreeBSD performance tuning. Sysctls, loader.conf, kernel

as seen on Server Fault - Search for 'Server Fault'
I wanted to share knowledge of tuning FreeBSD via sysctl.conf/loader.conf/KENCONF. It was initially based on Igor Sysoev's (author of nginx) presentation about FreeBSD tuning up to 100,000-200,000 active connections. Tunings are for FreeBSD-CURRENT. Since 7.2 amd64 some of them are tuned well by… >>> More
Boot FreeBSD/FreeNAS (their bootloader) from isolinux?

as seen on Super User - Search for 'Super User'
I'm creating a multiboot cd but have trouble with the FreeNAS/FreeBSD boot loader. If the image has isolinux, its just basically to copy & paste their config, but with the FreeBSD loader its different. Can someone please help me with this one? :) Thanks! >>> More
FreeBSD 8 Kernel Configuration Error Using the VESA Option

as seen on Server Fault - Search for 'Server Fault'
I'm trying to reconfigure FreeBSD 8 (amd64) to allow for a high resolution terminal by following these instructions. The problem is that when I add the two lines: options VESA options SC_PIXEL_MODE and try to build: make buildkernel KERNCONF=VESAKERN I get the following error: /usr/src/sys/amd64/conf/VESAKERN:… >>> More
Ierrs on Network Interface - Pfsense/Freebsd

as seen on Server Fault - Search for 'Server Fault'
Hello all, We're using PfSense as an internal router/firewall (no connection to WAN). Using the Web-GUI, under Status --- Interfaces, there's one particular interface where I have some errors: In/out errors 3513/0 I then SSHed to the firewall to validate the info provided by the WebGUI and… >>> More
Mounting a share with spaces in FreeBSD fstab

as seen on Server Fault - Search for 'Server Fault'
I'm trying to mount a smb network share in fstab on FreeBSD, which works fine for a share without spaces, but fails if a space is in the name. I have replaced the space with \040 which is what everything on google has said, but that didn't help. Share name I'm trying to mount is "Data Backups". Share… >>> More

Related posts about dhcp

nokia cell phone not accepting IP from dnsmasq dhcp server

as seen on Server Fault - Search for 'Server Fault'
Hello, I having problem connecting a NOkia cell phone to my home wifi network. The wifi network is provided by a wireless card in a machine running Debian Testing and 2.6.26-2-686 kernel. The cars is D-Link DWL-G520 working in ap mode and has WPA encryption enabled. The wireless network is provided… >>> More
dhcp-snooping option 82 drops valid dhcp requests on 2610 series Procurve switches

as seen on Server Fault - Search for 'Server Fault'
We are slowly starting to implement dhcp-snooping on our HP ProCurve 2610 series switches, all running the R.11.72 firmware. I'm seeing some strange behavior where dhcp-request or dhcp-renew packets are dropped when originating from "downstream" switches due "untrusted relay information from client"… >>> More
Windows Vista DHCP bug, arp authorize, isc dhcp, workaround

as seen on Server Fault - Search for 'Server Fault'
I am trying to find a workaround for the Windows Vista Force Broadcast bug with ISC DHCP and a Cisco Router. The problem is not windows vista trying to obtain an IP address from us that works fine (with or without the flag enabled). THe problem is we are using a cisco router and the command 'arp… >>> More
DHCP Relay V DHCP Local Cisco v 3com

as seen on Server Fault - Search for 'Server Fault'
Howdy, I have a client who has a WAN with 7 sites. At one site in particular, randomly about 4-5 clients do not get an IP address. The local gateway is a cisco 871 and relay's to a windows server in a Data Center running a valid scope for the subnet. If I put in a cisco 1800 and configure a dhcp… >>> More
DHCP Relay V DHCP Local Cisoc v 3com

as seen on Server Fault - Search for 'Server Fault'
Howdy, I have a client who has a WAN with 7 sites. At one site in particular, randomly about 4-5 clients do not get an IP address. The local gateway is a cisco 871 and relay's to a windows server in a Data Center running a valid scope for the subnet. If I put in a cisco 1800 and configure a dhcp… >>> More