Mar 25 22:09:03 jiehan-laptop kernel: [11723.790147] usb 2-1: new high speed USB device using ehci_hcd and address 4
Mar 25 22:09:04 jiehan-laptop kernel: [11724.223551] ipheth 2-1:4.2: Apple iPhone USB Ethernet device attached
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]:    SCPlugin-Ifupdown: devices added (path: /sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:4.2/net/eth1, iface: eth1)
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]:    SCPlugin-Ifupdown: device added (path: /sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:4.2/net/eth1, iface: eth1): no ifupdown configuration found.
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <error> [1301062145.293049] [nm-device-ethernet.c:763] real_update_permanent_hw_address(): (eth1): unable to read permanent MAC address (error 0)
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> (eth1): carrier is OFF
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> (eth1): new Ethernet device (driver: 'ipheth' ifindex: 12)
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> (eth1): exported as /org/freedesktop/NetworkManager/Devices/2
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> (eth1): now managed
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> (eth1): device state change: 1 -> 2 (reason 2)
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> (eth1): bringing up device.
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> (eth1): preparing device.
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> (eth1): deactivating device (reason: 2).
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> (eth1): carrier now ON (device state 2)
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> (eth1): device state change: 2 -> 3 (reason 40)
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> Activation (eth1) starting connection 'Auto Ethernet'
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> (eth1): device state change: 3 -> 4 (reason 0)
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> Activation (eth1) Stage 1 of 5 (Device Prepare) scheduled...
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> Activation (eth1) Stage 1 of 5 (Device Prepare) started...
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> Activation (eth1) Stage 2 of 5 (Device Configure) scheduled...
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> Activation (eth1) Stage 1 of 5 (Device Prepare) complete.
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> Activation (eth1) Stage 2 of 5 (Device Configure) starting...
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> (eth1): device state change: 4 -> 5 (reason 0)
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> Activation (eth1) Stage 2 of 5 (Device Configure) successful.
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> Activation (eth1) Stage 3 of 5 (IP Configure Start) scheduled.
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> Activation (eth1) Stage 2 of 5 (Device Configure) complete.
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> Activation (eth1) Stage 3 of 5 (IP Configure Start) started...
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> (eth1): device state change: 5 -> 7 (reason 0)
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> Activation (eth1) Beginning DHCPv4 transaction (timeout in 45 seconds)
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> dhclient started with pid 6454
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> Activation (eth1) Stage 3 of 5 (IP Configure Start) complete.
Mar 25 22:09:05 jiehan-laptop dhclient: Internet Systems Consortium DHCP Client 4.1.1-P1
Mar 25 22:09:05 jiehan-laptop dhclient: Copyright 2004-2010 Internet Systems Consortium.
Mar 25 22:09:05 jiehan-laptop dhclient: All rights reserved.
Mar 25 22:09:05 jiehan-laptop dhclient: For info, please visit https://www.isc.org/software/dhcp/
Mar 25 22:09:05 jiehan-laptop dhclient: 
Mar 25 22:09:05 jiehan-laptop NetworkManager[482]: <info> (eth1): DHCPv4 state changed nbi -> preinit
Mar 25 22:09:05 jiehan-laptop dhclient: Listening on LPF/eth1/06:1e:64:0c:76:d9
Mar 25 22:09:05 jiehan-laptop dhclient: Sending on   LPF/eth1/06:1e:64:0c:76:d9
Mar 25 22:09:05 jiehan-laptop dhclient: Sending on   Socket/fallback
Mar 25 22:09:05 jiehan-laptop dhclient: DHCPDISCOVER on eth1 to 255.255.255.255 port 67 interval 3
Mar 25 22:09:08 jiehan-laptop dhclient: DHCPDISCOVER on eth1 to 255.255.255.255 port 67 interval 3
Mar 25 22:09:11 jiehan-laptop dhclient: DHCPDISCOVER on eth1 to 255.255.255.255 port 67 interval 6
Mar 25 22:09:15 jiehan-laptop kernel: [11735.390047] eth1: no IPv6 routers present
Mar 25 22:09:17 jiehan-laptop dhclient: DHCPDISCOVER on eth1 to 255.255.255.255 port 67 interval 10
Mar 25 22:09:27 jiehan-laptop dhclient: DHCPDISCOVER on eth1 to 255.255.255.255 port 67 interval 12
Mar 25 22:09:39 jiehan-laptop dhclient: DHCPDISCOVER on eth1 to 255.255.255.255 port 67 interval 13
Mar 25 22:09:50 jiehan-laptop NetworkManager[482]: <warn> (eth1): DHCPv4 request timed out.
Mar 25 22:09:51 jiehan-laptop NetworkManager[482]: <info> (eth1): canceled DHCP transaction, DHCP client pid 6454
Mar 25 22:09:51 jiehan-laptop NetworkManager[482]: <info> Activation (eth1) Stage 4 of 5 (IP4 Configure Timeout) scheduled...
Mar 25 22:09:51 jiehan-laptop NetworkManager[482]: <info> Activation (eth1) Stage 4 of 5 (IP4 Configure Timeout) started...
Mar 25 22:09:51 jiehan-laptop NetworkManager[482]: <info> Activation (eth1) Stage 5 of 5 (IP Configure Commit) scheduled...
Mar 25 22:09:51 jiehan-laptop NetworkManager[482]: <info> Activation (eth1) Stage 4 of 5 (IP4 Configure Timeout) complete.
Mar 25 22:09:51 jiehan-laptop NetworkManager[482]: <info> Activation (eth1) Stage 5 of 5 (IP Configure Commit) started...
Mar 25 22:09:51 jiehan-laptop NetworkManager[482]: <info> Activation (eth1) Stage 5 of 5 (IP Configure Commit) failed (no IP configuration found)
Mar 25 22:09:51 jiehan-laptop NetworkManager[482]: <info> (eth1): device state change: 7 -> 9 (reason 5)
Mar 25 22:09:51 jiehan-laptop NetworkManager[482]: <info> Marking connection 'Auto Ethernet' invalid.
Mar 25 22:09:51 jiehan-laptop NetworkManager[482]: <warn> Activation (eth1) failed.
Mar 25 22:09:51 jiehan-laptop NetworkManager[482]: <info> Activation (eth1) Stage 5 of 5 (IP Configure Commit) complete.
Mar 25 22:09:51 jiehan-laptop NetworkManager[482]: <info> (eth1): device state change: 9 -> 3 (reason 0)
Mar 25 22:09:51 jiehan-laptop NetworkManager[482]: <info> (eth1): deactivating device (reason: 0).