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BSD

FreeBSD

Forcing link speed

 ifconfig em0 media 100BaseFX mediaopt full-duplex

parameter	description
autoselect	Enables auto-negotiation for speed and duplex.
10baseT/UTP	Sets 10Mbps operation. Use the mediaopt option to select full-duplex mode.
100baseTX	Sets 100Mbps operation. Use the mediaopt option to select full-duplex mode.
1000baseSX	Sets 1000Mbps operation. Only full-duplex mode is supported at this speed.
1000baseTX	Sets 1000Mbps operation. Only full-duplex mode is supported at this speed.
full-duplex	Forces full-duplex operation
half-duplex	Forces half-duplex operation.

working with routes (print routing table)

 netstat -rn

creating interface vlans

ifconfig vlan0 create
ifconfig vlan0 vlan 4 vlandev fxp0
ifconfig vlan0 inet a.a.a.a netmask x.x.x.x up

Firewalling

ipfw list

Going through heavy developing phase …