[root@szm X11]# ifconfig --help

Usage:

  ifconfig [-a] [-v] [-s] <interface> [[<AF>] <address>]

  [add <address>[/<prefixlen>]]

  [del <address>[/<prefixlen>]]

  [[-]broadcast [<address>]]  [[-]pointopoint [<address>]]

  [netmask <address>]  [dstaddr <address>]  [tunnel <address>]

  [outfill <NN>] [keepalive <NN>]

  [hw <HW> <address>]  [metric <NN>]  [mtu <NN>]

  [[-]trailers]  [[-]arp]  [[-]allmulti]

  [multicast]  [[-]promisc]

  [mem_start <NN>]  [io_addr <NN>]  [irq <NN>]  [media <type>]

  [txqueuelen <NN>]

  [[-]dynamic]

  [up|down] ...

  <HW>=Hardware Type.

  List of possible hardware types:

    loop (Local Loopback) slip (Serial Line IP) cslip (VJ Serial Line IP) 

    slip6 (6-bit Serial Line IP) cslip6 (VJ 6-bit Serial Line IP) adaptive (Adaptive Serial Line IP) 

    strip (Metricom Starmode IP) ash (Ash) ether (Ethernet) 

    tr (16/4 Mbps Token Ring) tr (16/4 Mbps Token Ring (New)) ax25 (AMPR AX.25) 

    netrom (AMPR NET/ROM) rose (AMPR ROSE) tunnel (IPIP Tunnel) 

    ppp (Point-to-Point Protocol) hdlc ((Cisco)-HDLC) lapb (LAPB) 

    arcnet (ARCnet) dlci (Frame Relay DLCI) frad (Frame Relay Access Device) 

    sit (IPv6-in-IPv4) fddi (Fiber Distributed Data Interface) hippi (HIPPI) 

    irda (IrLAP) ec (Econet) x25 (generic X.25) 

    infiniband (InfiniBand) 

  <AF>=Address family. Default: inet

  List of possible address families:

    unix (UNIX Domain) inet (DARPA Internet) inet6 (IPv6) 

    ax25 (AMPR AX.25) netrom (AMPR NET/ROM) rose (AMPR ROSE) 

    ipx (Novell IPX) ddp (Appletalk DDP) ec (Econet) 

    ash (Ash) x25 (CCITT X.25) 

[root@szm X11]# 

[root@szm X11]# 

[root@szm X11]# ifdown eth0

Device state: 3 (disconnected)

[root@szm X11]# ifup eth0

Active connection state: activating

Active connection path: /org/freedesktop/NetworkManager/ActiveConnection/1

state: activated

Connection activated

[root@szm X11]# ip --help

Usage: ip [ OPTIONS ] OBJECT { COMMAND | help }

       ip [ -force ] -batch filename

where  OBJECT := { link | addr | addrlabel | route | rule | neigh | ntable |

                   tunnel | maddr | mroute | mrule | monitor | xfrm }

       OPTIONS := { -V[ersion] | -s[tatistics]（詳細） | -d[etails] | -r[esolve] |

                    -f[amily]（特定協議信息） { inet | inet6 | ipx | dnet | link } |

                    -o[neline] | -t[imestamp] | -b[atch] [filename] |

                    -rc[vbuf] [size]}

[root@szm X11]#