half fuplex
Guys,
One of our servers is going to half duplex most of the time. It has 2 interfaces and other interface doesn't any problem. In network side it configured as full and I forced his cart to use it as full and still coming as half duplex. Also, I have switched the cable and have same issue. Our OS is linux, any help would be appreciated. |
If you force one side of the connection to be full duplex, you inherently break auto negotiation and this will likely be the reason that one side is falling back to half duplex.
You should either force both sides to be full duplex (under linux, you can use the 'ethtool' command to do this) or let autoneg do it's thing! |
Here is the out put. In the switch end set it to FUll duplex , so I forced it to full duplex and didn't fix. Also, I changed the network cable. Do you think the problem with network card? I have restarted eth0 as well didn't help.
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: Half Port: Twisted Pair PHYAD: 1 Transceiver: internal Auto-negotiation: on Supports Wake-on: g Wake-on: d Link detected: yes |
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To force this on your server you would do something like: ethtool -s eth0 speed 100 duplex full I'd advise you go read some documentation on networking basics to understand this. A good place to start on this topic would be some of the documents on Cisco's web site. |
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