Most network cards now-a-days autonegotiate their speend based on what the other end of your network cable will do. To see the speed of your card, as root, run mii-tool (part of the net-tools rpm).

root@host]# /sbin/mii-tool
eth0: negotiated 100baseTx-FD, link ok

You can get better performace by hard coding the speed and duplex. Since most NICs are [...]

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