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Debian - Ethernet stuck in half duplex

My eth0 is stuck in half duplex.

When I run: ethtool -s eth0 duplex full the console pauses for 10 secs and returns to the prompt, but the nic is still in half duplex. This is a 1Gig full duplex card.

I even added this to the etc/host/interfaces
ETHTOOL_OPTS="autoneg off speed 10 duplex full"

Any ideas?

elmoredaniel

ASKER

correction: /etc/network/interfaces

Ibrahim Bazarwala

mii-tool -F 100baseTx-FD eth0

elmoredaniel

ASKER

That did not work for me. No madder what commands I use I can't change the duplex or the speed. Below is the ethtool output.

----------------------------
Settings for eth0:
Supported ports: [ MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Advertised auto-negotiation: Yes
Speed: 10Mb/s
Duplex: Half
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: g
Wake-on: d
Current message level: 0x000000ff (255)
Link detected: yes

Ibrahim Bazarwala

Try this
http://kbase.redhat.com/faq/FAQ_80_483.shtm

ASKER CERTIFIED SOLUTION

kyle_in_taiwan

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elmoredaniel

ASKER

Okay, the problem occured because autoneg was on, and the switch was broadcasting half duplex. I'll award points for the cyberciti.biz article because it mentioned that.

Thanks everyone.