Can't change from half-duplex to full-duplex on a gigabit nic

brgsousa · 05-29-2010, 09:17 AM

Hi,
I'm trying to change duplex mode on a debian box without success:

Code:

root@k2:~# ethtool eth0
Settings for eth0:
        Supported ports: [ TP 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 pause frame use: No
        Advertised auto-negotiation: Yes
        Link partner advertised link modes:  10baseT/Half 10baseT/Full
                                             100baseT/Half 100baseT/Full
                                             1000baseT/Half 1000baseT/Full
        Link partner advertised pause frame use: No
        Link partner advertised auto-negotiation: Yes
        Speed: 1000Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
        Supports Wake-on: pumbg
        Wake-on: g
        Current message level: 0x00000033 (51)
        Link detected: yes
root@k2:~# mii-tool eth0
eth0: negotiated 1000baseT-HD flow-control, link ok
root@k2:~# ethtool -s eth0 speed 1000 duplex full autoneg on
root@k2:~# mii-tool eth0
eth0: negotiated 1000baseT-HD flow-control, link ok
root@k2:~# ethtool -s eth0 speed 1000 duplex full autoneg off
Cannot set new settings: Invalid argument
  not setting speed
  not setting duplex
  not setting autoneg
root@k2:~# mii-tool eth0
eth0: negotiated 1000baseT-HD flow-control, link ok

What can be the problem?

regards

dxqcanada · 05-29-2010, 10:20 AM

Did you check the man page to verify the parameters?

brgsousa · 05-29-2010, 10:44 AM

yes I did.

ethtool -s ethX speed N [duplex half|full] [port tp|aui|bnc|mii] [autoneg on|off] [advertise N] [phyad N]
[xcvr internal|external] [wol p|u|m|b|a|g|s|d...] [sopass xx:yy:zz:aa:bb:cc] [msglvl N]

timetraveler · 05-29-2010, 10:51 AM

Your first output of ethtool shows Duplex: Full

miitool is obsolete, right?

brgsousa · 05-29-2010, 11:03 AM

you're right timetraveler.
did a little search here, looks like mii-tool is indeed obsolete.