[CentOS] 3Com 3c940 moel only giving me 100 mb throughput to network switch
Eero Volotinen
eero.volotinen at iki.fi
Mon Nov 23 19:18:38 UTC 2009
>> ethtool eth0
>> Settings for eth0:
>> Supported ports: [ TP ]
>> Supported link modes: 10baseT/Half 10baseT/Full
>> 100baseT/Half 100baseT/Full
>> 1000baseT/Full
>> Supports auto-negotiation: Yes
>> Advertised link modes: 10baseT/Half 10baseT/Full
>> 100baseT/Half 100baseT/Full
>> 1000baseT/Full
>> Advertised auto-negotiation: Yes
>> Speed: 100Mb/s
>
> I'd expect that to mean that it was connected to a 100Mb switch port or
> a managed switch configured to force 100Mb.
>
>> But then I tried this. Typing:
>>
>> ethtool --change eth0 speed 1000 duplex full autoneg on
>>
>> DID work! But I wonder why it didn't pick up on that automagically.
>
> But then that wouldn't have worked either.
>
>> And thanks, Les, for the ethtool reminder/tip!
>
> Mii-tool does some of the same things but won't show/force 1000BaseT.
> Also, you can put ETHTOOL_OPTS=... in your ifcfg-eth? files if you need
> to force something odd.
>
Are you using cat 5e or cat 6 (gigabit certified) cable?
--
Eero
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