我的拓扑结构如下：
Fiber -> Modem --[PPPoE]--> WiFi Router --[Cable]--> Win Computer A
|
`-------[Cable]--> Mac Computer B
我的 WiFi 路由器是 RT-AC66R，它有最新的官方固件。我在调试此问题时更换了网线和路由器端口，但没有任何变化。
IP 为 192.168.1.217（A）和 192.168.1.164（B）。
我打开 Windows 电脑后，Mac 电脑的 ping 时间在几毫秒内。过了一会儿，它开始变差：
64 bytes from 192.168.1.217: icmp_seq=1277 ttl=128 time=4617.294 ms
64 bytes from 192.168.1.217: icmp_seq=1278 ttl=128 time=3614.986 ms
64 bytes from 192.168.1.217: icmp_seq=1279 ttl=128 time=8025.265 ms
64 bytes from 192.168.1.217: icmp_seq=1280 ttl=128 time=8024.973 ms
^C
--- 192.168.1.217 ping statistics ---
1289 packets transmitted, 1021 packets received, 20.8% packet loss
round-trip min/avg/max/stddev = 0.313/4254.498/9027.763/2814.197 ms
当我最终得到 100％ 数据包丢失时：
mbp13:~ $ ping 192.168.1.217
PING 192.168.1.217 (192.168.1.217): 56 data bytes
Request timeout for icmp_seq 0
Request timeout for icmp_seq 1
Request timeout for icmp_seq 2
Request timeout for icmp_seq 3
^C
--- 192.168.1.217 ping statistics ---
5 packets transmitted, 0 packets received, 100.0% packet loss
从 B 计算机到 A 计算机也是如此：
C:\Windows\System32>ping 192.168.1.164
Pinging 192.168.1.164 with 32 bytes of data:
Reply from 192.168.1.217: Destination host unreachable.
Reply from 192.168.1.217: Destination host unreachable.
Reply from 192.168.1.217: Destination host unreachable.
Reply from 192.168.1.217: Destination host unreachable.
Ping statistics for 192.168.1.164:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
我认为导致此问题的原因之一是我在 Windows 计算机上使用了 AT&T 的 VPN 程序。以下是 Windows 计算机的完整网络接口列表：
C:\Windows\System32>ipconfig /all
Windows IP Configuration
Host Name . . . . . . . . . . . . : ADMINIB-UMUK56L
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : br.ibm.com
br.ibm.com
ibm.com
br.ibm.com
ibm.com
br.ibm.com
ibm.com
br.ibm.com
ibm.com
br.ibm.com
ibm.com
Ethernet adapter Bluetooth Network Connection 2:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Bluetooth Device (Personal Area Network) #2
Physical Address. . . . . . . . . : 0C-84-DC-E7-EF-3E
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Ethernet adapter Local Area Connection 2:
Connection-specific DNS Suffix . : br.ibm.com
Description . . . . . . . . . . . : AGN Virtual Network Adapter
Physical Address. . . . . . . . . : 02-50-F2-00-00-05
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::e927:5878:a84b:6a93%16(Preferred)
IPv4 Address. . . . . . . . . . . : 9.18.197.97(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
IPv4 Address. . . . . . . . . . . : 9.78.134.254(Duplicate)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :
DHCPv6 IAID . . . . . . . . . . . : 654463218
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1A-7B-08-38-28-D2-44-48-BC-D6
DNS Servers . . . . . . . . . . . : 9.0.132.50
9.0.134.50
NetBIOS over Tcpip. . . . . . . . : Enabled
Wireless LAN adapter Wireless Network Connection:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) Centrino(R) Advanced-N 6205
Physical Address. . . . . . . . . : A4-4E-31-EC-A2-F8
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) 82579LM Gigabit Network Connection
Physical Address. . . . . . . . . : 28-D2-44-48-BC-D6
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::65db:7ae2:5eb0:df7c%12(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.217(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Friday, May 15, 2015 1:48:09 PM
Lease Expires . . . . . . . . . . : Saturday, May 16, 2015 1:48:09 PM
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 352330188
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1A-7B-08-38-28-D2-44-48-BC-D6
DNS Servers . . . . . . . . . . . : 192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Enabled
Tunnel adapter Local Area Connection* 11:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Teredo Tunneling Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2001:0:5cf2:8c43:c13:2c00:3f57:fe26(Preferred)
Link-local IPv6 Address . . . . . : fe80::c13:2c00:3f57:fe26%10(Preferred)
Default Gateway . . . . . . . . . :
NetBIOS over Tcpip. . . . . . . . : Disabled
Tunnel adapter isatap.{41161D7E-20EC-4444-A6DC-18861FEACA07}:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter isatap.br.ibm.com:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : br.ibm.com
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter isatap.{3ACCE85C-CBDA-4533-B4C5-BDCD00EEB1AD}:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #3
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter isatap.{5536D00D-DF99-4540-BAB6-B0A790A70A81}:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #4
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter 6TO4 Adapter:
Connection-specific DNS Suffix . : br.ibm.com
Description . . . . . . . . . . . : Microsoft 6to4 Adapter #2
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2002:912:c561::912:c561(Preferred)
IPv6 Address. . . . . . . . . . . : 2002:94e:86fe::94e:86fe(Preferred)
Default Gateway . . . . . . . . . :
DNS Servers . . . . . . . . . . . : 9.0.132.50
9.0.134.50
NetBIOS over Tcpip. . . . . . . . : Disabled