mac 上的 ifconfig 查看多出来了很多网卡，这是怎么回事？？

查看 ifconfig 的时候，多出来很多网卡，而且 google 上我没有搜索到答案啊（中文 google ），这是怎么回事？能删么？怎么删？

我知道开了 6to4 那个，会获得 ipv6 的地址，但我这个是内网的吧？而且怎么这么多个？？其他的呢？？？因为现在开机上网速度很慢，我觉得会不会跟这个网卡的事情有关系所以来问问。

我的网络配置如下：

ifconfig 命令如下：

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=1<UP> mtu 1280
	nd6 options=209<PERFORMNUD,IFDISABLED,DAD>
EHC29: flags=0<> mtu 0
EHC26: flags=0<> mtu 0
XHC20: flags=0<> mtu 0
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
	ether b8:f6:b1:18:50:81 
	inet6 fe80::105d:38e9:2c8a:a6%en0 prefixlen 64 secured scopeid 0x7 
	inet 192.168.31.226 netmask 0xffffff00 broadcast 192.168.31.255
	nd6 options=201<PERFORMNUD,DAD>
	media: autoselect
	status: active
p2p0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 2304
	ether 0a:f6:b1:18:50:81 
	media: autoselect
	status: inactive
awdl0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1484
	ether f6:2a:1c:84:d4:4b 
	inet6 fe80::f42a:1cff:fe84:d44b%awdl0 prefixlen 64 scopeid 0x9 
	nd6 options=201<PERFORMNUD,DAD>
	media: autoselect
	status: active
en1: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
	options=60<TSO4,TSO6>
	ether 32:00:11:cf:7c:00 
	media: autoselect <full-duplex>
	status: inactive
en2: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
	options=60<TSO4,TSO6>
	ether 32:00:11:cf:7c:01 
	media: autoselect <full-duplex>
	status: inactive
bbptp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1356
	ether 7e:dd:51:e4:6b:40 
	inet6 fe80::7cdd:51ff:fee4:6b40%bbptp0 prefixlen 64 scopeid 0xc 
	inet6 fd30:f1fe:d3b2:b025:107e:5501:7fd6:7070 prefixlen 64 
	nd6 options=201<PERFORMNUD,DAD>
	status: active
bridge0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
	options=63<RXCSUM,TXCSUM,TSO4,TSO6>
	ether 32:00:11:cf:7c: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 10 priority 0 path cost 0
	member: en2 flags=3<LEARNING,DISCOVER>
	        ifmaxaddr 0 port 11 priority 0 path cost 0
	nd6 options=201<PERFORMNUD,DAD>
	media: <unknown type>
	status: inactive
utun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 2000
	inet6 fe80::1eb8:cbe:38f1:bf18%utun0 prefixlen 64 scopeid 0xe 
	nd6 options=201<PERFORMNUD,DAD>
utun1: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380
	inet6 fe80::bc0:72a1:4429:b8a%utun1 prefixlen 64 scopeid 0xf 
	nd6 options=201<PERFORMNUD,DAD>
utun2: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380
	inet6 fe80::3764:e844:80a3:7a98%utun2 prefixlen 64 scopeid 0x10 
	nd6 options=201<PERFORMNUD,DAD>
utun3: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380
	inet6 fe80::197:f2e0:67ea:ccaf%utun3 prefixlen 64 scopeid 0x11 
	nd6 options=201<PERFORMNUD,DAD>
utun4: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380
	inet6 fe80::a8d6:27ef:583:34e5%utun4 prefixlen 64 scopeid 0x12 
	nd6 options=201<PERFORMNUD,DAD>