mac ifconfig详解
lo
# loopback 本机主机地址
# flag=8049:网络设备状态标识
# UP:网卡处于启动状态
# LOOPBACK:IP数据包回送到本机上,通常用于测试网络配置和本地程序之间通信用
# RUNNING:代表网卡的网线被接上
# MULTICAS:网卡可以发送多播包
# mtu:最大传输单元(这里设置的16384是否以太网设置的？)
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAS> mtu 16384
# 参数? 可以设置值
options=1203<RXCSUM,TXCSUM,TXSTATUS,SW_TIMESTAMP>
# ipv4地址 127.0.0.1 子网掩码 255.0.0.0
inet 127.0.0.1 netmask 0xff000000
inet6 ::1 prefixlen 128
# ipv6地址
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
nd6 options=201<PERFORMNUD,DAD>
gif
# software network interface 网络接口
# POINTOPOINT: 允许2台机器点对点直连
# MULTICAS:网卡可以发送多播包
# mtu:最大传输单元(这里设置的1280是否以太网设置的？)
gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
stf
# stf 6to4 tunnel interface 配置隧道
stf0: flags=0<> mtu 1280
XHC20
# XHC20
XHC20: flags=0<> mtu 0
en0
# en0: 以太网0
# flags=8863:网络状态标识
# BROADCAST:有广播地址，支持发广播包
# SMART:
# RUNNING:代表网卡的网线被接上
# MULTICAS:网卡可以发送多播包
# mtu: 最大传输单元
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
ether c4:b3:01:ce:06:11
# ipv4地址 子网掩码 广播地址
inet 192.168.1.11 netmask 0xffffff00 broadcast 192.168.1.255
# 网络媒介类型 (可手动指定)
media: autoselect
# 激活状态
status: active
p2p0
# p2p0:Point-to-Point 协议
p2p0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 2304
ether 06:b3:01:ce:06:11
# 网络媒介类型
media: autoselect
# 闲置的
status: inactive
awdl0
# awdl0: airdrop peer to peer(一种mesh network)，apple airdrop设备特有
# Apple: 无线直接链接
# PROMISC: 允许混杂的模式(全部的数据会被接口接收)
awdl0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1484
ether a6:04:50:c4:66:92
inet6 fe80::a404:50ff:fec4:6692%awdl0 prefixlen 64 scopeid 0x7
nd6 options=201<PERFORMNUD,DAD>
# 网络媒介类型
media: autoselect
# 激活状态
status: active
en1 en2
此处为何这么多en接口呢 运行命令行networksetup -listallhardwareports 可查看具体接口是做何操作的 具体结果
Hardware Port: Wi-Fi
Device: en0
Ethernet Address: c4:b3:01:ce:06:11
Hardware Port: Bluetooth PAN
Device: en3
Ethernet Address: c4:b3:01:ce:06:12
Hardware Port: Thunderbolt 1
Device: en1
Ethernet Address: 4a:00:07:5c:bd:00
Hardware Port: Thunderbolt 2
Device: en2
Ethernet Address: 4a:00:07:5c:bd:01
Hardware Port: Thunderbolt Bridge
Device: bridge0
Ethernet Address: 4a:00:07:5c:bd:00
VLAN Configurations
===================
# en1: 以太网1 雷电口1
en1: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
options=60<TSO4,TSO6>
ether 4a:00:07:5c:bd:00
media: autoselect <full-duplex>
status: inactive
en2: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
options=60<TSO4,TSO6>
ether 4a:00:07:5c:bd:01
media: autoselect <full-duplex>
status: inactive
bridge0
# 具体google下桥接知识
bridge0: flags=8822<BROADCAST,SMART,SIMPLEX,MULTICAST> mtu 1500
options=63<RXCSUM,TXCSUM,TSO4,TSO6>
ether 4a:00:07:5c:bd:00
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 8 priority 0 path cost 0
member: en2 flags=3<LEARNING,DISCOVER>
ifmaxaddr 0 port 9 priority 0 path cost 0
media: <unknown type>
status: inactive
