DHCP lease being renewed every 30 seconds!

[Sebastian Tennant <sebyte@smolny.plus.com>]

Hi all,

I'm running Debian GNU/Linux on an i686 platform.  I've recently
reinstalled from scratch and have since noticed that my DHCP lease
(correct terminology?) is being renewed every 30 seconds, causing the
following three lines to be written to my syslog every 30 seconds.
This was never the case before.

  Oct 25 23:58:08 localhost dhclient: DHCPREQUEST on eth0 to 192.168.1.1 port 67
  Oct 25 23:58:08 localhost dhclient: DHCPACK from 192.168.1.1
  Oct 25 23:58:08 localhost dhclient: bound to 82.155.151.120 -- renewal in 30
seconds.

Is this behaviour normal?  If so, what could have changed?  My ADSL
internet connection appears to be functioning normally.  How can I
configure dhclient or syslog not to record this level of information?

Yours with very little clue about DHCP and leases,

sebyte