/etc/init.d/networking restart

Listening on LPF/eth0/00:05:5d:f2:78:d7
Sending on   LPF/eth0/00:05:5d:f2:78:d7
Sending on   Socket/fallback
DHCPRELEASE on eth0 to 192.168.1.1 port 67
Error for wireless request "Set Mode" (8B06) :
    SET failed on device eth0 ; Operation not supported.
Internet Systems Consortium DHCP Client V3.0.4
Copyright 2004-2006 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

Listening on LPF/eth0/00:05:5d:f2:78:d7
Sending on   LPF/eth0/00:05:5d:f2:78:d7
Sending on   Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 6
DHCPOFFER from 192.168.1.1
DHCPREQUEST on eth0 to 255.255.255.255 port 67
DHCPACK from 192.168.1.1
bound to 192.168.1.102 -- renewal in 41830 seconds.
done.
# interfaces @ /etc/network/interfaces

# The primary network interface (wireless)
auto eth0
allow-hotplug eth0
iface eth0 inet dhcp
        hostname dual
        wireless-mode managed
        wireless-essid my essid
        wireless-key1 xxxxxxxxxx

# ifconnfig output
eth0      Link encap:Ethernet  HWaddr 00:05:5D:F2:78:D7
          inet addr:192.168.1.102  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::205:5dff:fef2:78d7/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:11173 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8252 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:12497042 (11.9 MiB)  TX bytes:1337721 (1.2 MiB)
          Interrupt:169 Base address:0xe100

eth1      Link encap:Ethernet  HWaddr 00:08:A1:20:2A:CC
          inet6 addr: fe80::208:a1ff:fe20:2acc/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:159 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
          Interrupt:185 Base address:0xec00

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:981 errors:0 dropped:0 overruns:0 frame:0
          TX packets:981 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:286757 (280.0 KiB)  TX bytes:286757 (280.0 KiB)