Re: Excessive amount of dhcp requests

[Dan Williams <dcbw redhat com>]

On Thu, 2008-12-04 at 08:41 -0500, Nicolas Girard wrote:
> I'm seeing the same thing in my logs. This is a recent regression
> though as it was not happening just a few weeks ago... Dan, I could
> find out the exact svn revisions if you need. 

NM doesn't do anything with explicit lease times, that's all handled by
dhclient internally.  Could you do a few things to nail this down?

1) write a simple dispatcher script that just does "env > /tmp/foo" and
find the lease time that dhclient reports to NetworkManager

2) ensure you haven't got any overrides
in /etc/dhclient.conf, /etc/dhcp4/dhclient.conf, /etc/dhclient-eth0.conf, or whereever your distro stores config files.  NM will merge dhclient config files, and you may have done something with the lease time manually.

Dan

> Nicolas
> 
> 
> On Thu, Dec 4, 2008 at 5:09 AM, Dominique Leuenberger
> <Dominique Leuenberger tmf-group com> wrote:
>         Hi everybody,
>         
>         I remarked today that my system is requesting more often than
>         needed a
>         dhcp lease.
>         In fact, it get's it every 30  minutes.
>         
>         From the log files:
>         Dec  4 09:04:48 3120-2914 dhclient: Internet Systems
>         Consortium DHCP
>         Client V3.1.1
>         Dec  4 09:04:48 3120-2914 dhclient: Copyright 2004-2008
>         Internet
>         Systems Consortium.
>         Dec  4 09:04:48 3120-2914 dhclient: All rights reserved.
>         Dec  4 09:04:48 3120-2914 dhclient: For info, please visit
>         http://www.isc.org/sw/dhcp/
>         Dec  4 09:04:48 3120-2914 dhclient:
>         Dec  4 09:04:49 3120-2914 dhclient: Listening on
>         LPF/eth0/00:1d:09:db:9c:e1
>         Dec  4 09:04:49 3120-2914 dhclient: Sending on
>         LPF/eth0/00:1d:09:db:9c:e1
>         Dec  4 09:04:49 3120-2914 dhclient: Sending on
>         Socket/fallback
>         Dec  4 09:04:49 3120-2914 dhclient: DHCPDISCOVER on eth0 to
>         255.255.255.255 port 67 interval 3
>         Dec  4 09:04:49 3120-2914 dhclient: DHCPOFFER from 10.1.0.151
>         Dec  4 09:04:53 3120-2914 dhclient: DHCPREQUEST on eth0 to
>         255.255.255.255 port 67
>         Dec  4 09:04:53 3120-2914 dhclient: DHCPACK from 10.1.0.151
>         Dec  4 09:04:53 3120-2914 dhclient: bound to 10.1.12.149 --
>         renewal in
>         1705 seconds.
>         Dec  4 09:04:54 3120-2914 if-up.d/21-dhcpcd-hook-samba: No
>         dhcpcd info
>         nor dhclient leases file found for eth0.
>         Dec  4 09:33:18 3120-2914 dhclient: DHCPREQUEST on eth0 to
>         10.1.0.151
>         port 67
>         Dec  4 09:33:18 3120-2914 dhclient: DHCPACK from 10.1.0.151
>         Dec  4 09:33:18 3120-2914 dhclient: bound to 10.1.12.149 --
>         renewal in
>         1698 seconds.
>         Dec  4 10:01:36 3120-2914 dhclient: DHCPREQUEST on eth0 to
>         10.1.0.151
>         port 67
>         Dec  4 10:01:36 3120-2914 dhclient: DHCPACK from 10.1.0.151
>         Dec  4 10:01:36 3120-2914 dhclient: bound to 10.1.12.149 --
>         renewal in
>         1408 seconds.
>         Dec  4 10:25:04 3120-2914 dhclient: DHCPREQUEST on eth0 to
>         10.1.0.151
>         port 67
>         Dec  4 10:25:04 3120-2914 dhclient: DHCPACK from 10.1.0.151
>         Dec  4 10:25:04 3120-2914 dhclient: bound to 10.1.12.149 --
>         renewal in
>         1368 seconds.
>         Dec  4 10:47:52 3120-2914 dhclient: DHCPREQUEST on eth0 to
>         10.1.0.151
>         port 67
>         Dec  4 10:47:52 3120-2914 dhclient: DHCPACK from 10.1.0.151
>         Dec  4 10:47:52 3120-2914 dhclient: bound to 10.1.12.149 --
>         renewal in
>         1429 seconds.
>         
>         
>         The DHCP server is set to give out leases of 3 days.
>         This is also confirmed if I use dhcpcd-test eth0, the lease
>         time is set
>         to 259200
>         
>         I'm running
>         NetworkManager-0.7.0.r4323-1.8
>         NetworkManager-gnome-0.7.0.r1043-1.7
>         
>         on an openSUSE 11.1 box.
>         
>         How can this 'noise' on the network be reduced? Just imagine
>         all the
>         stations on the network doing this.
>         
>         Thanks for your support,
>         Dominique
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