首先，这不是网络的问题，而是我的笔记本电脑的问题。
在过去的几个月里，我无法访问 172.xxx 子网中的任何计算机或本地内联网网站。我是一名 VoIP 顾问，经常在各种企业网络内工作，并且在多个单独的客户网络上遇到过此问题。
据我所知，我的笔记本电脑没有任何变化，我甚至重新安装了 Windows。
这是我的问题的一个例子，我无法访问 IP 为 172.23.232.22 或该子网中的任何其他 IP 地址的服务器 Web GUI。
- 我尝试创建到该子网的持久路由，但没有成功。
- 该问题似乎影响每个网络适配器，包括有线、无线，甚至 VPN。
- 我通过 Wireshark 监控了我的测试 ping，它们似乎进入了黑洞，在 ping 任何 172.xxx 子网时，我从未看到任何 ICMP 数据包
- 我已经能够通过启动虚拟机、将我的以太网连接桥接到虚拟机来成功访问 B 类网络，因此这是该操作系统特有的功能。
以下是一些详细信息和故障排除：
Ping 172.23.232.22
Pinging 172.23.232.22 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 172.23.232.22:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
Tracert 172.23.232.22
Tracing route to 172.23.232.22 over a maximum of 30 hops
1 * * * Request timed out.
2 * * * Request timed out.
3 * * * Request timed out.
Wireless LAN adapter Wi-Fi:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) Centrino(R) Advanced-N 6205
Physical Address. . . . . . . . . : 84-3A-4B-05-99-3A
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 10.23.75.136(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.254.0
Lease Obtained. . . . . . . . . . : Thursday, January 8, 2015 9:30:56 AM
Lease Expires . . . . . . . . . . : Friday, January 16, 2015 11:23:15 AM
Default Gateway . . . . . . . . . : 10.23.74.1
DHCP Server . . . . . . . . . . . : 1.1.1.1
DNS Servers . . . . . . . . . . . : 192.168.13.24
NetBIOS over Tcpip. . . . . . . . : Enabled
Route Print
Interface List
15...00 ff 88 18 04 70 ......TAP-Windows Adapter V9
13...54 2e 81 6f 94 10 ......Check Point Virtual Network Adapter For Endpo
PN Client
12...86 3a 4b 05 99 3a ......Microsoft Hosted Network Virtual Adapter
7...20 68 9d 2a d8 5e ......Bluetooth Device (Personal Area Network)
5...84 3a 4b 05 99 3b ......Microsoft Wi-Fi Direct Virtual Adapter
4...84 3a 4b 05 99 3a ......Intel(R) Centrino(R) Advanced-N 6205
3...3c 97 0e 58 ec 4d ......Intel(R) 82579LM Gigabit Network Connection
9...00 50 56 c0 00 01 ......VMware Virtual Ethernet Adapter for VMnet1
11...00 50 56 c0 00 08 ......VMware Virtual Ethernet Adapter for VMnet8
1...........................Software Loopback Interface 1
32...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #4
31...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #14
44...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #15
===========================================================================
IPv4 Route Table
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 10.23.74.1 10.23.75.136 25
10.23.74.0 255.255.254.0 On-link 10.23.75.136 281
10.23.75.136 255.255.255.255 On-link 10.23.75.136 281
10.23.75.255 255.255.255.255 On-link 10.23.75.136 281
127.0.0.0 255.0.0.0 On-link 127.0.0.1 306
127.0.0.1 255.255.255.255 On-link 127.0.0.1 306
127.255.255.255 255.255.255.255 On-link 127.0.0.1 306
192.168.26.0 255.255.255.0 On-link 192.168.26.1 276
192.168.26.1 255.255.255.255 On-link 192.168.26.1 276
192.168.26.255 255.255.255.255 On-link 192.168.26.1 276
192.168.164.0 255.255.255.0 On-link 192.168.164.1 276
192.168.164.1 255.255.255.255 On-link 192.168.164.1 276
192.168.164.255 255.255.255.255 On-link 192.168.164.1 276
224.0.0.0 240.0.0.0 On-link 127.0.0.1 306
224.0.0.0 240.0.0.0 On-link 10.23.75.136 281
224.0.0.0 240.0.0.0 On-link 192.168.26.1 276
224.0.0.0 240.0.0.0 On-link 192.168.164.1 276
255.255.255.255 255.255.255.255 On-link 127.0.0.1 306
255.255.255.255 255.255.255.255 On-link 10.23.75.136 281
255.255.255.255 255.255.255.255 On-link 192.168.26.1 276
255.255.255.255 255.255.255.255 On-link 192.168.164.1 276
===========================================================================
Persistent Routes:
None
IPv6 Route Table
Active Routes:
If Metric Network Destination Gateway
1 306 ::1/128 On-link
11 276 fe80::/64 On-link
9 276 fe80::/64 On-link
9 276 fe80::967:4aa2:ae4b:3c55/128
On-link
11 276 fe80::50c9:810b:5d06:c4a5/128
On-link
1 306 ff00::/8 On-link
9 276 ff00::/8 On-link
11 276 ff00::/8 On-link
===========================================================================
Persistent Routes:
None
有任何想法吗？