desculpe glilco ...
minha conexao e cabeada também igual a sua, estou usando a do trabalho.
em casa uso net 3g da oi, funciona normalmente.
não quero repetir meus problemas pois tudo que você menciona anteriormente também ocorre comigo, exatamente igual.
tenho certeza que não é a configuração da rede pois no windows funciona normalmente, então por ai já eliminamos a possibilidade de alguma falha na estrutura física ou lógica.
Após o reboot, a net funciona por algum período e ai tento modificar as configuração e veja o que ocorre...
diogo@diogo:~$ sudo ifconfig 192.168.0.104 netmask 255.255.255.0 up
SIOCSIFNETMASK: Dispositivo inexistente
192.168.0.104: ERRO ao obter marcadores da interface: Dispositivo inexistente
diogo@diogo:~$
diogo@diogo:~$ ifconfig
eth0 Link encap:Ethernet Endereço de HW f0:4d:a2:d5:d2:0d
endereço inet6: fe80::f24d:a2ff:fed5:d20d/64 Escopo:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Métrica:1
pacotes RX:4703 erros:0 descartados:707 excesso:707 quadro:707
Pacotes TX:2771 erros:1 descartados:0 excesso:1 portadora:9
colisões:0 txqueuelen:1000
RX bytes:5110305 (5.1 MB) TX bytes:334976 (334.9 KB)
IRQ:47
diogo@diogo:~$ lspci
00:00.0 Host bridge: Intel Corporation Core Processor DRAM Controller (rev 02)
00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 02)
00:16.0 Communication controller: Intel Corporation 5 Series/3400 Series Chipset HECI Controller (rev 06)
00:1a.0 USB Controller: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller (rev 05)
00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio (rev 05)
00:1c.0 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 1 (rev 05)
00:1c.1 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 2 (rev 05)
00:1c.2 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 3 (rev 05)
00:1c.4 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 5 (rev 05)
00:1d.0 USB Controller: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller (rev 05)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev a5)
00:1f.0 ISA bridge: Intel Corporation Mobile 5 Series Chipset LPC Interface Controller (rev 05)
00:1f.2 SATA controller: Intel Corporation 5 Series/3400 Series Chipset 6 port SATA AHCI Controller (rev 05)
00:1f.3 SMBus: Intel Corporation 5 Series/3400 Series Chipset SMBus Controller (rev 05)
00:1f.6 Signal processing controller: Intel Corporation 5 Series/3400 Series Chipset Thermal Subsystem (rev 05)
12:00.0 Network controller: Broadcom Corporation BCM4313 802.11b/g LP-PHY (rev 01)
13:00.0 Ethernet controller: Atheros Communications AR8152 v2.0 Fast Ethernet (rev c1)
diogo@diogo:~$
diogo@diogo:~$ lsmod
Module Size Used by
ath 10413 0
cfg80211 170293 1 ath
atl2 26364 0
atl1e 34420 0
atl1 33691 0
mii 5261 1 atl1
binfmt_misc 7984 1
parport_pc 30086 0
ppdev 6804 0
joydev 11363 0
snd_hda_codec_idt 64667 1
i915 330249 3
drm_kms_helper 32836 1 i915
drm 206161 4 i915,drm_kms_helper
snd_hda_intel 26019 2
snd_hda_codec 100919 2 snd_hda_codec_idt,snd_hda_intel
snd_hwdep 6660 1 snd_hda_codec
snd_pcm 89104 2 snd_hda_intel,snd_hda_codec
snd_seq_midi 5932 0
snd_rawmidi 22207 1 snd_seq_midi
snd_seq_midi_event 7291 1 snd_seq_midi
snd_seq 57512 2 snd_seq_midi,snd_seq_midi_event
uvcvideo 62379 0
videodev 49359 1 uvcvideo
v4l1_compat 15519 2 uvcvideo,videodev
v4l2_compat_ioctl32 12486 1 videodev
snd_timer 23850 2 snd_pcm,snd_seq
snd_seq_device 6912 3 snd_seq_midi,snd_rawmidi,snd_seq
dell_wmi 3372 0
i2c_algo_bit 6208 1 i915
video 22176 1 i915
dell_laptop 6722 0
output 2527 1 video
snd 64117 13 snd_hda_codec_idt,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
dcdbas 6910 1 dell_laptop
psmouse 62080 0
serio_raw 4910 0
intel_ips 13252 0
soundcore 1240 1 snd
snd_page_alloc 8588 2 snd_hda_intel,snd_pcm
intel_agp 32080 2 i915
lp 10201 0
parport 37032 3 parport_pc,ppdev,lp
usbhid 42062 0
hid 84678 1 usbhid
usb_storage 50372 0
ahci 21857 0
libahci 26167 4 ahci
atl1c 34955 0
diogo@diogo:~$