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Cannot access network through eth0

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Newbie user... do be gentle.

* I have almost zero-speed LAN and internet connectivity. (Max. 500 BPS, that too in short bursts)
* Very rarely, when I restart, LAN and Internet activates, and the connectivity is maintained till the next restart.

* My network settings detect eth0 and it is activated.
* The network connections icon on the top panel shows network not connected.
* In Menu>>System tools>>Network connections, the network device is shown as 'Loopback'. eth0 is available from the drop-down menu, but it again reverts to loopback the next time.
* I ran ethtool eth0, after manually turning auto-negotiation off: the o/p is as shown:

Quote:

Settings for eth0:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Advertised auto-negotiation: No
Speed: 100Mb/s
Duplex: Full
Port: MII
PHYAD: 1
Transceiver: internal
Auto-negotiation: off
Current message level: 0x00000037 (55)
Link detected: yes

* Following some advice, I turned off and blacklisted ipv6, to no avail.
* Having to use Windows to be online and post this message, please help !!

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Re: Cannot access network through eth0

Submitted by hildebrand_us on Tue, 2008-05-06 05:55.

Hi Manu
The first requirement is that your driver should be loaded properly.
The second is that your settings are put correctly for ip, gateway etc. (sometimes if one of these is not correct also you can have problem).
If net is detected properly after booting in running "dmesg|grep eth0" should give you results something like this:-
eth0: Broadcom 4400 10/100BaseT Ethernet 00:16:d4:d7:61:3a
ADDRCONF(NETDEV_UP): eth0: link is not ready
b44: eth0: Link is up at 100 Mbps, full duplex.
b44: eth0: Flow control is off for TX and off for RX.
ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready

Your module name maybe different from b44 though. Correct connection should be there like it shows up. Link shall be up if configured properly.
If he is going directly for loopback it seems to be an improper setting.
Use any graphical setting tool like kontrol panel or Settings->Networking and ensure these are set:-
1. IP
2. Default Gateway
3. Subnet mask
4. DNS Server Addresses.
If your isp is allowing you dhcp then you can do dhcp instead of manually setting these values.
once this is done correctly you shall be able to connect to internet.
Regards
Hildebrand

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