$ ethtool eth0 | grep Duplex
 Duplex: Half

ise farklı sunucularla iletişirken sorun yaşanabiliyor. Benim sorun yaşadığım durumda sunucu 1’den sunucu 2’ye giden isteklerin bazılarında iletişim problemleri oluştu.

SUNUCU A (ubuntu 14.04)

$ ethtool eth0
 Settings for eth0:
 Supported ports: [ TP ]
 Supported link modes: 10baseT/Half 10baseT/Full
 100baseT/Half 100baseT/Full
 1000baseT/Full
 Supported pause frame use: No
 Supports auto-negotiation: Yes
 Advertised link modes: 10baseT/Half 10baseT/Full
 100baseT/Half 100baseT/Full
 1000baseT/Full
 Advertised pause frame use: No
 Advertised auto-negotiation: Yes
 Speed: 100Mb/s
 Duplex: Half
 Port: Twisted Pair
 PHYAD: 1
 Transceiver: internal
 Auto-negotiation: on
 MDI-X: Unknown
 Supports Wake-on: g
 Wake-on: d
 Link detected: yes

SUNUCU B (ubuntu 14.04)
$ ethtool eth0

$ ethtool eth0
 Settings for eth0:
 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: Symmetric
 Advertised auto-negotiation: Yes
 Link partner advertised link modes: 10baseT/Half 10baseT/Full
 100baseT/Half 100baseT/Full
 1000baseT/Full
 Link partner advertised pause frame use: Symmetric
 Link partner advertised auto-negotiation: Yes
 Speed: 1000Mb/s
 Duplex: Full
 Port: Twisted Pair
 PHYAD: 1
 Transceiver: internal
 Auto-negotiation: on
 MDI-X: off
 Supports Wake-on: g
 Wake-on: d
 Current message level: 0x000000ff (255)
 drv probe link timer ifdown ifup rx_err tx_err
 Link detected: yes

Sunucu A’nın Duplex’i Full yaptıktan sonra sorunlar düzeldi. Bunu yapmak için sunucu a’da izlenmesi gereken adımlar şunlar

$ vim /etc/network/interfaces

iface eth0 inet static

altına

post-up /sbin/ethtool -s eth0 speed 100 duplex full autoneg off

ekleyin ve reboot yapın.

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