Nic’in özelliklerinin elde edilmesi
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
Duplex: Full
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: d
Wake-on: d
Link detected: yes
Duplex değeri için 3 olasılık vardır
- Full duplex : Enables sending and receiving of packets at the same time. This mode is used when the ethernet device is connected to a switch.
- Half duplex : Enables either sending or receiving of packets at a single point of time. This mode is used when the ethernet device is connected to a hub.
- Auto-negotiation : If enabled, the ethernet device itself decides whether to use either full duplex or half duplex based on the network the ethernet device attached to.
ethtool -s ile nic özellikleri değiştirilebilir.
autoneg özelliğini değiştirelim.
ifdown eth0
eth0 device: Broadcom Corporation NetXtreme II BCM5709 Gigabit Ethernet (rev 20)
eth0 configuration: eth-bus-pci-0000:0b:00.0
ethtool -s eth0 autoneg off
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: Not reported
Advertised auto-negotiation: No
Speed: Unknown! (65535)
Duplex: Unknown! (255)
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: off
Supports Wake-on: g
Wake-on: g
Link detected: no
# ifup eth0
Nic’in speed değerini sabitlemek için:
ethtool -s eth0 speed 100 autoneg off
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: Not reported
Advertised auto-negotiation: No
Speed: Unknown! (65535)
Duplex: Unknown! (255)
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: off
Supports Wake-on: g
Wake-on: g
Link detected: no
ethtool -i ile firmware ve driver özellikleri öğrenilebilir.
# ethtool -i eth0 driver: bnx2 version: 2.0.1-suse firmware-version: 1.9.3 bus-info: 0000:04:00.0
Nic’in ağ istatistiklerini öğrenmek için ethtool -S kullanılabilir
# ethtool -S eth0
NIC statistics:
rx_bytes: 74356477841
rx_error_bytes: 0
tx_bytes: 110725861146
tx_error_bytes: 0
rx_ucast_packets: 104169941
rx_mcast_packets: 138831
rx_bcast_packets: 59543904
tx_ucast_packets: 118118510
tx_mcast_packets: 10137453
tx_bcast_packets: 2221841
tx_mac_errors: 0
tx_carrier_errors: 0
rx_crc_errors: 0
rx_align_errors: 0
tx_single_collisions: 0
tx_multi_collisions: 0
tx_deferred: 0
tx_excess_collisions: 0
tx_late_collisions: 0
tx_total_collisions: 0
rx_fragments: 0
rx_jabbers: 0
rx_undersize_packets: 0
rx_oversize_packets: 0
rx_64_byte_packets: 61154057
rx_65_to_127_byte_packets: 55038726
rx_128_to_255_byte_packets: 426962
rx_256_to_511_byte_packets: 3573763
rx_512_to_1023_byte_packets: 893173
rx_1024_to_1522_byte_packets: 42765995
rx_1523_to_9022_byte_packets: 0
tx_64_byte_packets: 3633165
tx_65_to_127_byte_packets: 51169838
tx_128_to_255_byte_packets: 3812067
tx_256_to_511_byte_packets: 113766
tx_512_to_1023_byte_packets: 104081
tx_1024_to_1522_byte_packets: 71644887
tx_1523_to_9022_byte_packets: 0
rx_xon_frames: 0
rx_xoff_frames: 0
tx_xon_frames: 0
tx_xoff_frames: 0
rx_mac_ctrl_frames: 0
rx_filtered_packets: 14596600
rx_discards: 0
rx_fw_discards: 0
Network düzgün çalışmıyorsa
- Speed ve Duplex değerlerinin “Unknown” olmasına
- Link detection değerinin No olmasına
bakılabilir.
Nic’in ledini yakmak için -p kullanılabilir
ethtool -p eth0
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