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Old 01-11-2015, 06:33 AM   #1
GunFighT
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Distribution: Debian/Ubuntu, Rocky Linux
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Question mii-tool print report


Hello all,

I`ve found out something that is anoing, when I use mii-tool. I`m using CentOS release 6.6 (Final) Linux gunfight 2.6.32-504.3.3.el6.x86_64 #1 SMP Wed Dec 17 01:55:02 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

Examples:
Code:
[root@gunfight ~]# mii-tool eth1
eth1: negotiated 100baseTx-FD flow-control, link ok
Far this way, looks fine, untill I type:
Code:
[root@gunfight ~]# dmesg | grep -i duplex
skge eth1: Link is up at 1000 Mbps, full duplex, flow control both
Code:
[root@gunfight ~]# ethtool eth1
Settings for eth1:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Half 1000baseT/Full
        Supported pause frame use: No
        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
        Speed: 1000Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
        MDI-X: Unknown
        Supports Wake-on: pg
        Wake-on: g
        Current message level: 0x00000037 (55)
                               drv probe link ifdown ifup
        Link detected: yes
Does anyone know why mii-tool reports 100Mbps, even if the interface haves 1000Mbps?
I`ve tested this in a Gbit router - and negociates 1000Mbps, same on my laptop.

Thank you!
 
Old 01-11-2015, 06:47 AM   #2
michaelk
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Do not use it. mii-tool is deprecated and does not support Gig ethernet adapters.
 
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Old 01-11-2015, 09:59 AM   #3
GunFighT
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If so , the topic can be closed.
Thank you!
 
Old 01-11-2015, 10:05 AM   #4
michaelk
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