Public bug reported:
I run an up-to-date Gutsy Gibbon (7.10) on a no-name laptop. I use
wireless network with WPA supplicant almost exclusively.
Recently, after the latest round of updates, I have noticed that my
syslog is getting flooded with messages from dhclient. It appears that
every four minutes, dhclient is trying to obtain an IP address for eth0,
which is the wired interface, and is not connected. Each time dhclient
runs, it outputs between 5 and 7 lines into /var/log/syslog.
Running the command sudo ifdown eth0 stops the messages.
Previously (i.e. before the last couple of weeks or so), the system did
not continually try to obtain an IP on the unconnected wired interface
eth0.
Output of uname -a:
Linux gandalf 2.6.22-14-generic #1 SMP Fri Feb 1 04:59:50 UTC 2008 i686
GNU/Linux
Output of dpkg -S /sbin/dhclient:
dhcp3-client: /sbin/dhclient
>From /etc/network/interfaces
# loopback
auto lo
iface lo inet loopback
# wired interface
auto eth0
iface eth0 inet dhcp
# wireless interface
auto eth1
iface eth1 inet dhcp
wpa-driver wext
wpa-ssid <SNIP>
wpa-ap-scan 1
wpa-proto WPA
wpa-pairwise TKIP
wpa-group TKIP
wpa-key-mgmt WPA-PSK
wpa-psk <SNIP>
eth0 boot messages from /var/log/syslog
Feb 8 20:20:01 gandalf kernel: [ 3.588000] eth0: RTL8168b/8111b at
0xf8864000, 00:16:d4:b5:50:e3, XID 38000000 IRQ 19
Feb 8 20:20:01 gandalf kernel: [ 11.632000] r8169: eth0: link down
Feb 8 20:20:03 gandalf dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port
67 interval 6
Feb 8 20:20:09 gandalf dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port
67 interval 11
Feb 8 20:20:10 gandalf kernel: [ 26.728000] ADDRCONF(NETDEV_UP): eth0: link
is not ready
Feb 8 20:20:20 gandalf dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port
67 interval 8
Feb 8 20:20:28 gandalf avahi-autoipd(eth0)[6250]: Found user 'avahi-autoipd'
(UID 104) and group 'avahi-autoipd' (GID 110).
Feb 8 20:20:28 gandalf avahi-autoipd(eth0)[6250]: Successfully called chroot().
Feb 8 20:20:28 gandalf avahi-autoipd(eth0)[6250]: Successfully dropped root
privileges.
Feb 8 20:20:28 gandalf avahi-autoipd(eth0)[6250]: fopen() failed: Permission
denied
Feb 8 20:20:28 gandalf avahi-autoipd(eth0)[6250]: Starting with address
169.254.9.141
Feb 8 20:20:34 gandalf avahi-autoipd(eth0)[6250]: Callout BIND, address
169.254.9.141 on interface eth0
Feb 8 20:20:36 gandalf avahi-daemon[5659]: Joining mDNS multicast group on
interface eth0.IPv4 with address 169.254.9.141.
Feb 8 20:20:36 gandalf avahi-daemon[5659]: Registering new address record for
169.254.9.141 on eth0.IPv4.
Feb 8 20:20:38 gandalf avahi-autoipd(eth0)[6250]: Successfully claimed IP
address 169.254.9.141
Feb 8 20:20:38 gandalf avahi-autoipd(eth0)[6250]: fopen() failed: Permission
denied
Example log noise from /var/log/syslog
Feb 8 07:42:49 gandalf dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port
67 interval 3
Feb 8 07:42:52 gandalf dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port
67 interval 8
Feb 8 07:43:00 gandalf dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port
67 interval 20
Feb 8 07:43:20 gandalf dhclient: No DHCPOFFERS received.
Feb 8 07:43:20 gandalf dhclient: No working leases in persistent database -
sleeping.
Feb 8 07:46:50 gandalf dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port
67 interval 4
Feb 8 07:46:54 gandalf dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port
67 interval 5
Feb 8 07:46:59 gandalf dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port
67 interval 7
Feb 8 07:47:06 gandalf dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port
67 interval 8
Feb 8 07:47:14 gandalf dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port
67 interval 7
Feb 8 07:47:21 gandalf dhclient: No DHCPOFFERS received.
Feb 8 07:47:21 gandalf dhclient: No working leases in persistent database -
sleeping.
** Affects: dhcp3 (Ubuntu)
Importance: Undecided
Status: New
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dhclient continually seeks ip address on unconnected interface
https://bugs.launchpad.net/bugs/190359
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