前言

• CentOS6.5

關閉網卡

shell> ifconfig lo down

啟動網卡

shell> ifconfig lo up

示例

先禁用 lo 網卡，再啟動lo 網卡，再禁用 lo 網卡。觀察ifconfig -a的輸出的不同。

shell> ifconfig -a eth0 Link encap:Ethernet HWaddr 00:0C:29:04:0C:28inet addr:192.168.150.30 Bcast:192.168.150.255 Mask:255.255.255.0inet6 addr: fe80::20c:29ff:fe04:c28/64 Scope:LinkUP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1RX packets:221 errors:0 dropped:0 overruns:0 frame:0TX packets:165 errors:0 dropped:0 overruns:0 carrier:0collisions:0 txqueuelen:1000RX bytes:23624 (23.0 KiB) TX bytes:23767 (23.2 KiB)lo Link encap:Local Loopbackinet addr:127.0.0.1 Mask:255.0.0.0inet6 addr: ::1/128 Scope:HostUP LOOPBACK RUNNING MTU:16436 Metric:1RX packets:0 errors:0 dropped:0 overruns:0 frame:0TX packets:0 errors:0 dropped:0 overruns:0 carrier:0collisions:0 txqueuelen:0RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)shell> ifconfig lo down shell> ifconfig -a eth0 Link encap:Ethernet HWaddr 00:0C:29:04:0C:28inet addr:192.168.150.30 Bcast:192.168.150.255 Mask:255.255.255.0inet6 addr: fe80::20c:29ff:fe04:c28/64 Scope:LinkUP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1RX packets:252 errors:0 dropped:0 overruns:0 frame:0TX packets:183 errors:0 dropped:0 overruns:0 carrier:0collisions:0 txqueuelen:1000RX bytes:26370 (25.7 KiB) TX bytes:26867 (26.2 KiB)lo Link encap:Local Loopbackinet addr:127.0.0.1 Mask:255.0.0.0LOOPBACK MTU:16436 Metric:1RX packets:0 errors:0 dropped:0 overruns:0 frame:0TX packets:0 errors:0 dropped:0 overruns:0 carrier:0collisions:0 txqueuelen:0RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) shell> ifconfig lo up shell> ifconfig -a eth0 Link encap:Ethernet HWaddr 00:0C:29:04:0C:28inet addr:192.168.150.30 Bcast:192.168.150.255 Mask:255.255.255.0inet6 addr: fe80::20c:29ff:fe04:c28/64 Scope:LinkUP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1RX packets:316 errors:0 dropped:0 overruns:0 frame:0TX packets:218 errors:0 dropped:0 overruns:0 carrier:0collisions:0 txqueuelen:1000RX bytes:31892 (31.1 KiB) TX bytes:31669 (30.9 KiB)lo Link encap:Local Loopbackinet addr:127.0.0.1 Mask:255.0.0.0inet6 addr: ::1/128 Scope:HostUP LOOPBACK RUNNING MTU:16436 Metric:1RX packets:0 errors:0 dropped:0 overruns:0 frame:0TX packets:0 errors:0 dropped:0 overruns:0 carrier:0collisions:0 txqueuelen:0RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) 與50位技術專家面對面20年技術見證，附贈技術全景圖

總結

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