引言 Intro
圖片源鏈：https://pixnio.com/zh/植物/花/丁香花-葉子-園藝-花瓣-花園-自然-夏天-花
我知道的終端命令還不多，ifconfig在這些當中數最溫柔的，像個丁香姑娘一樣。
if config ? 這不是問你，R U ready嗎 ? （而不是“你配嗎？”）
正題 Contents
有一天，我聽着Wake Me Up When Sept Ends，開始跟這個姑娘對話。
✔ ifconfig
然后，發現姑娘是個話癆，可能大多數碼農都希望跟一個話癆的漂亮姑娘瞎扯。
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
options=1203<RXCSUM,TXCSUM,TXSTATUS,SW_TIMESTAMP>
inet 127.0.0.1 netmask 0xff000000
inet6 ::1 prefixlen 128
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
nd6 options=201<PERFORMNUD,DAD>
gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
stf0: flags=0<> mtu 1280
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=400<CHANNEL_IO>
ether 24:8c:89:8a:0c:a7
inet6 f380::5498:f96d:91e6:ab55%en0 prefixlen 64 secured scopeid 0x4
inet 192.168.6.15 netmask 0xffffff00 broadcast 192.168.6.255
nd6 options=201<PERFORMNUD,DAD>
media: autoselect
status: active
en1: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
options=460<TSO4,TSO6,CHANNEL_IO>
ether 83:33:35:3c:3a:8080
media: autoselect <full-duplex>
status: inactive
en2: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
options=460<TSO4,TSO6,CHANNEL_IO>
ether 86:23:25:2c:2a:21
media: autoselect <full-duplex>
status: inactive
bridge0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=63<RXCSUM,TXCSUM,TSO4,TSO6>
ether 32:14:35:b6:55:8080
Configuration:
id 0:0:0:0:0:0 priority 0 hellotime 0 fwddelay 0
maxage 0 holdcnt 0 proto stp maxaddr 100 timeout 1200
root id 0:0:0:0:0:0 priority 0 ifcost 0 port 0
ipfilter disabled flags 0x2
member: en1 flags=3<LEARNING,DISCOVER>
ifmaxaddr 0 port 5 priority 0 path cost 0
member: en2 flags=3<LEARNING,DISCOVER>
ifmaxaddr 0 port 6 priority 0 path cost 0
nd6 options=201<PERFORMNUD,DAD>
media: <unknown type>
status: inactive
p2p0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 2304
options=400<CHANNEL_IO>
ether 56:44:33:4a:76:f7
media: autoselect
status: inactive
awdl0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1484
options=400<CHANNEL_IO>
ether fa:af:f8:06:38:b1
inet6 fe55::62af:f4ff:fe06:38b1%awdl0 prefixlen 64 scopeid 0x9
nd6 options=201<PERFORMNUD,DAD>
media: autoselect
status: active
llw0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=400<CHANNEL_IO>
ether fa:ad:24:06:38:b1
inet6 fe80::88af:s4ff:6e06:38b1%llw0 prefixlen 64 scopeid 0xa
nd6 options=201<PERFORMNUD,DAD>
media: autoselect
status: active
utun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380
inet6 fe80::e8e6:6dfb:19b2:e1a8%utun0 prefixlen 64 scopeid 0xb
nd6 options=201<PERFORMNUD,DAD>
utun1: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 2000
inet6 fe80::f936:1e21:9f45:1a1f%utun1 prefixlen 64 scopeid 0xc
nd6 options=201<PERFORMNUD,DAD>
utun2: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380
inet6 fe80::1280:c301:e74e:6204%utun2 prefixlen 64 scopeid 0xd
nd6 options=201<PERFORMNUD,DAD>
utun3: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380
inet6 fe80::e522:fc15:58c8:504d%utun3 prefixlen 64 scopeid 0xe
nd6 options=201<PERFORMNUD,DAD>
utun4: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380
inet6 fe80::70cc:fe62:f622:850f%utun4 prefixlen 64 scopeid 0xf
nd6 options=201<PERFORMNUD,DAD>
utun5: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380
inet6 fe80::986f:ffbb:f421:7c8c%utun5 prefixlen 64 scopeid 0x10
nd6 options=201<PERFORMNUD,DAD>
utun6: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380
inet6 fe80::7fc5:f4c2:afe2:5ba1%utun6 prefixlen 64 scopeid 0x12
nd6 options=201<PERFORMNUD,DAD>
utun7: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380
inet6 fe80::efe6:afd3:3358:2af1%utun7 prefixlen 64 scopeid 0x13
nd6 options=201<PERFORMNUD,DAD>
en5: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
options=400<CHANNEL_IO>
ether 72:f0:87:7a:fb:48
inet6 fe80::cf:542f:e34d:7393%en5 prefixlen 64 secured scopeid 0x11
inet 169.254.116.211 netmask 0xffff0000 broadcast 169.254.255.255
nd6 options=201<PERFORMNUD,DAD>
media: autoselect (100baseTX <full-duplex>)
status: active
~
Photo by Andre Guerra on Unsplash
WHAT ?
What R U talking about? What the hell is?
啥，你說啥？每個字我都懂，就是不知道連起來是個啥？？？
Fine, 咱得研究。
問問知乎
果然有，知乎真是個哆唻A夢。
- lo0 = loopback
- gif0 = Software Network Interface
- stf0 = 6to4 tunnel interface
- en0 = Ethernet 0
- fw0 = Firewire
- en1 = Ethernet 1
- vmnet8 = Virtual Interface
- vmnet1 = Virtual Interface
作者：非著名開發者
鏈接：https://www.zhihu.com/question/36861098/answer/105332446
來源：知乎
著作權歸作者所有。商業轉載請聯系作者獲得授權，非商業轉載請注明出處。
解析
1.lo0 - Loopback
第一行看到了端倪，LOOPBACK 回路。
不懂的代碼，擼唄~
lo，取了前倆字母。想起了OC的runloop。
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
lo 是表示主機的回壞地址，這個一般是用來測試一個網絡程序，但又不想讓局域網或外網的用戶能夠查看，只能在此台主機上運行和查看所用的網絡接口。
比如把 httpd服務器的指定到回壞地址，在瀏覽器輸入127.0.0.1就能看到你所架WEB網站了。但只是您能看得到，局域網的其它主機或用戶無從知道。 -- 引自CSDN聚優致成轉載的ifconfig 詳解(回環估計是寫了錯別字成回壞了)
2.gif0 - Software Network
OK, 我看了還是不懂，gif跟Software Network Interface占了啥親？？？
if代表interface?g是general?
先緩緩，有不懂才會念念不忘。好比，要讓個姑娘記住，就不能把才華全撒出去，得留點兒，要不一輩子辣么長，多沒勁。
3.stf0 - 6to4 tunnel interface
six to four --> stf
4.en0 - Ethernet 0
5.fw0 - Firewire
6.en1 - Ethernet 1
7.vmnet8 - Virtual Interface
這個我又不懂了，為啥有個m啊。virtual micro net?
8.vmnet1 - Virtual Interface
還是不懂的en0
Ethernet 0, 以太網0，額，是個啥？？？
是時候祭出大招了。RRRRRR
只見搖身一晃，天空風起雲涌起來，霎時間又彩徹區明，一段代碼妖嬈而飄飄忽忽，徐徐而來，如一縷清風
networksetup -listallhardwareports
當是時，有幾段分外祥和可親緊隨其后
Hardware Port: Wi-Fi
Device: en0
Ethernet Address: f4:5c:89:ba:7c:f7
Hardware Port: iPhone USB
Device: en5
Ethernet Address: 72:f0:87:7a:ab:48
Hardware Port: Bluetooth PAN
Device: en3
Ethernet Address: f4:5c:89:ba:7c:f8
Hardware Port: Thunderbolt 1
Device: en1
Ethernet Address: 82:13:15:bc:5a:80
Hardware Port: Thunderbolt 2
Device: en2
Ethernet Address: 82:13:15:bc:5a:81
Hardware Port: Thunderbolt Bridge
Device: bridge0
Ethernet Address: 82:13:15:bc:5a:80
VLAN Configurations
===================
好一個好外婆，Hardware Port.
欲知后事，請看下回...
To be continued...