This article describes the setup of an Ethernet network device.
To choose the right driver, first detect the used Ethernet controllers. Use lspci for this task:
lspci | grep --color Ethernet
The next step is to activate the kernel options appropriate to the Ethernet hardware in the machine. Open up a second terminal window in order to reference the output generated in the step above. The option to enable Ethernet drivers can be found in the following location:
Device Drivers ---> Networking support ---> [*] Network device support ---> [*] Ethernet driver support --->
Scan the drivers carefully. Compare the results of the lspci command above with the available drivers in the list. Enable the feature(s) that match the installed Ethernet device(s).
For more information on configuring the kernel see the kernel configuration article.
Physical interface settings
List eth0 physical interface settings using sys-apps/ethtool:
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: 1000Mb/s Duplex: Full Port: Twisted Pair PHYAD: 0 Transceiver: internal Auto-negotiation: on MDI-X: off (auto) Supports Wake-on: umbg Wake-on: g Current message level: 0x00000007 (7) drv probe link Link detected: yes
- Or using mii-tool from sys-apps/net-tools package:
mii-tool eth0 -v
eth0: negotiated 1000baseT-FD flow-control, link ok product info: vendor 23:58:00, model 42 rev 0 basic mode: autonegotiation enabled basic status: autonegotiation complete, link ok capabilities: 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD advertising: 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control link partner: 1000baseT-HD 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
The output of mii-tool sometimes does not work for certain network drivers.
Physical interface features (TCP offloading)
Sometimes NIC's have basic/partial TCP/IP stack implementation, and support offloading of certain networking routines/protocols to the NIC chip.
Example below shows network interface offloading features supported on device eth0:
ethtool --show-offload eth0
Features for eth0: rx-checksumming: off tx-checksumming: on tx-checksum-ipv4: off [fixed] tx-checksum-ip-generic: on tx-checksum-ipv6: off [fixed] tx-checksum-fcoe-crc: off [fixed] tx-checksum-sctp: off [fixed] scatter-gather: on tx-scatter-gather: on tx-scatter-gather-fraglist: off [fixed] tcp-segmentation-offload: on tx-tcp-segmentation: on tx-tcp-ecn-segmentation: off [fixed] tx-tcp6-segmentation: off [fixed] udp-fragmentation-offload: off [fixed] generic-segmentation-offload: on generic-receive-offload: on large-receive-offload: off [fixed] rx-vlan-offload: on tx-vlan-offload: on [fixed] ntuple-filters: off [fixed] receive-hashing: off [fixed] highdma: off [fixed] rx-vlan-filter: on [fixed] vlan-challenged: off [fixed] tx-lockless: off [fixed] netns-local: off [fixed] tx-gso-robust: off [fixed] tx-fcoe-segmentation: off [fixed] fcoe-mtu: off [fixed] tx-nocache-copy: on loopback: off [fixed] rx-fcs: off rx-all: off
- Network management — describes possibilities for managing the network stack.
- Power management/Ethernet — describes the setup of power management of Ethernet devices.