Re: Network Interface Conundrum

On Sat, 22 Sep 2012, Ottavio Caruso wrote:

> What's the output of "ifconfig -a" ?

   System booted with ethernet cable connected; boot process shows dhcpcd
trying to find a wireless ap and failing. Only relevant portions of dmesg
are:

[    8.927888] Intel(R) Wireless WiFi Link AGN driver for Linux, in-tree:
[    8.935151] Copyright(c) 2003-2011 Intel Corporation
[    8.942467] iwlwifi 0000:02:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ
16
[    8.949814] iwlwifi 0000:02:00.0: setting latency timer to 64
[    8.949846] iwlwifi 0000:02:00.0: pci_resource_len = 0x00002000
[    8.957157] iwlwifi 0000:02:00.0: pci_resource_base = ffffc90010084000
[    8.964517] iwlwifi 0000:02:00.0: HW Revision ID = 0x0
[    8.971861] iwlwifi 0000:02:00.0: irq 42 for MSI/MSI-X
[    8.971898] iwlwifi 0000:02:00.0: Detected Intel(R) Centrino(R)
Wireless-N 1000 BGN, REV=0x6C
[    8.979223] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S
[    9.007436] iwlwifi 0000:02:00.0: device EEPROM VER=0x15d, CALIB=0x6
[    9.014491] iwlwifi 0000:02:00.0: Device SKU: 0X50
[    9.021382] iwlwifi 0000:02:00.0: Valid Tx ant: 0X1, Valid Rx ant: 0X3
[    9.028213] iwlwifi 0000:02:00.0: Tunable channels: 13 802.11bg, 0
802.11a channels
[    9.035111] iwlwifi 0000:02:00.0: RF_KILL bit toggled to disable radio.

[    9.569155] iwlwifi 0000:02:00.0: loaded firmware version 39.31.5.1 build
35138

[  374.484715] Modules linked in: snd_seq_dummy snd_seq_oss
snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss ipv6
cpufreq_ondemand acpi_cpufreq freq_table mperf lp ppdev parport_pc parport
fuse uvcvideo videodev v4l2_compat_ioctl32 i915 drm_kms_helper drm
snd_hda_codec_hdmi acer_wmi snd_hda_codec_conexant joydev sparse_keymap
intel_agp iwlwifi mac80211 i2c_i801 cfg80211 mei(C) i2c_algo_bit intel_gtt
ehci_hcd i2c_core snd_hda_intel snd_hda_codec wmi snd_hwdep snd_pcm
snd_timer rts_pstor(C) snd sony_laptop processor soundcore video thermal
rfkill snd_page_alloc agpgart battery psmouse thermal_sys evdev button ac
atl1c hwmon serio_raw sg loop ext3 jbd mbcache

   Interface status with cat5 connected is:

[root@pachy ~]# ifconfig -a
eth0      Link encap:Ethernet  HWaddr 78:84:3c:aa:1e:63
           inet addr:192.168.55.5  Bcast:192.168.55.255  Mask:255.255.255.0
           inet6 addr: fe80::7a84:3cff:feaa:1e63/64 Scope:Link
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:156 errors:0 dropped:0 overruns:0 frame:0
           TX packets:71 errors:0 dropped:0 overruns:0 carrier:3
           collisions:0 txqueuelen:1000
           RX bytes:67198 (65.6 KiB)  TX bytes:12063 (11.7 KiB)
           Interrupt:45

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:50 errors:0 dropped:0 overruns:0 frame:0
           TX packets:50 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:0
           RX bytes:3732 (3.6 KiB)  TX bytes:3732 (3.6 KiB)

wlan0     Link encap:Ethernet  HWaddr 74:e5:0b:63:20:16
           BROADCAST MULTICAST  MTU:1500  Metric:1
           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

   Kernel routing table is:

Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         192.168.55.4    0.0.0.0         UG        0 0          0 eth0
127.0.0.0       0.0.0.0         255.0.0.0       U         0 0          0 lo
192.168.55.0    0.0.0.0         255.255.255.0   U         0 0          0 eth0

   Cable removed; /var/log/messages shows:

Sep 23 08:56:37 pachy kernel: [  359.026344] atl1c 0000:09:00.0: atl1c: eth0
NIC Link is Down

   Interface status now:

[root@pachy ~]# ifconfig -a
eth0      Link encap:Ethernet  HWaddr 78:84:3c:aa:1e:63
           inet addr:192.168.55.5  Bcast:192.168.55.255  Mask:255.255.255.0
           inet6 addr: fe80::7a84:3cff:feaa:1e63/64 Scope:Link
           UP BROADCAST MULTICAST  MTU:1500  Metric:1
           RX packets:188 errors:0 dropped:0 overruns:0 frame:0
           TX packets:74 errors:0 dropped:0 overruns:0 carrier:4
           collisions:0 txqueuelen:1000
           RX bytes:73473 (71.7 KiB)  TX bytes:12303 (12.0 KiB)
           Interrupt:45

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:50 errors:0 dropped:0 overruns:0 frame:0
           TX packets:50 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:0
           RX bytes:3732 (3.6 KiB)  TX bytes:3732 (3.6 KiB)

wlan0     Link encap:Ethernet  HWaddr 74:e5:0b:63:20:16
           BROADCAST MULTICAST  MTU:1500  Metric:1
           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

   ... and /var/log/messages shows:

Sep 23 08:56:46 pachy kernel: [  368.897876] atl1c 0000:09:00.0: atl1c: eth0
NIC Link is Up<100 Mbps Full Duplex>
Sep 23 08:56:52 pachy kernel: [  374.484711] NETDEV WATCHDOG: eth0 (atl1c):
transmit queue 0 timed out
Sep 23 08:56:52 pachy kernel: [  374.499217] atl1c 0000:09:00.0: atl1c: eth0
NIC Link is Up<100 Mbps Full Duplex>

   /etc/rc.d/init.d/ifplugd is invoked during the boot process.

Rich