Buffer read error when reading leases file.

Neff, Glen glen.neff at emc.com
Thu Nov 14 13:16:06 UTC 2013

I haven't had your issue (but I might of had things continued), but I seem to remember something about the defaults for these values being problematically low & causing a lot of churn in the lease file.  These settings were recommended to me:

option dhcp-renewal-time 3600;
option dhcp-rebinding-time 7200;
allow leasequery;
option dhcp6.info-refresh-time 21600;


 * Glen R. J. Neff
 * USD Lab Operations Infrastructure Team
 * glen.neff at emc.com
 * EMC^2 == E^2
From: dhcp-users-bounces+glen.neff=emc.com at lists.isc.org [dhcp-users-bounces+glen.neff=emc.com at lists.isc.org] On Behalf Of Steve [steve at iwwd.com]
Sent: Wednesday, November 13, 2013 6:46 PM
To: dhcp-users at lists.isc.org
Subject: Buffer read error when reading leases file.

Hi All,

I’ve been trying to debug why our dhcp-v6 service wasn’t starting when this line appeared in syslog:

dhcpd: /var/lib/dhcp/dhcpd6.leases: file is too long to buffer.

Upon checking the file, I found it was a massive 6.2GB in file size!

This server handles a floating number of around 300-500 clients-devices, how on earth could the leases file grown this large?


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