我最近在我的 Windows 7 64 位计算机上安装了 Intel Gigabit CT 网络适配器。以前，我使用的是无线连接和 Cisco AnyConnect VPN 客户端版本 3.1.0165。当我尝试在工作中连接到 VPN 时，我首先成功连接，但随后断开连接并无法重新连接。这是我们 Cisco 服务器的一个已知问题。它总是在最初几分钟内断开连接然后重新连接。如果我使用无线连接连接到家里的路由器，一切都会正常。它会断开连接然后自动重新连接并保持连接。但如果我使用新的 Intel 适配器进行连接，它就会无法重新连接。我将此问题追溯到 Cisco 客户端断开连接时，它会删除我的默认网关路由。我不明白为什么它只在我通过以太网适配器连接而不是通过无线连接时才会这样做。我已经尝试卸载并重新安装网卡驱动程序。之后唯一有帮助的就是禁用然后启用后置适配器，但这对重新连接到 VPN 没有帮助。以下是连接到 VPN 之前的配置和路由：
Ethernet adapter Local Area Connection 2:
Connection-specific DNS Suffix . : hsd1.ct.comcast.net
Description . . . . . . . . . . . : Intel(R) Gigabit CT Desktop Adapter
Physical Address. . . . . . . . . : 68-05-CA-24-F6-F9
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::a9c5:1e77:aa50:1ade%55(Preferred)
IPv4 Address. . . . . . . . . . . : 10.0.0.49(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Saturday, July 19, 2014 11:11:25 PM
Lease Expires . . . . . . . . . . : Saturday, July 26, 2014 11:11:25 PM
Default Gateway . . . . . . . . . : 10.0.0.1
DHCP Server . . . . . . . . . . . : 10.0.0.1
DHCPv6 IAID . . . . . . . . . . . : 929564106
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-15-C5-00-D6-18-03-73-AE-4A-21
DNS Servers . . . . . . . . . . . : 75.75.75.75
75.75.76.76
NetBIOS over Tcpip. . . . . . . . : Enabled
路线：
===========================================================================
Interface List
55...68 05 ca 24 f6 f9 ......Intel(R) Gigabit CT Desktop Adapter
26...38 59 f9 6a 55 59 ......Microsoft Virtual WiFi Miniport Adapter
12...38 59 f9 6a 55 59 ......DW1501 Wireless-N WLAN Half-Mini Card
1...........................Software Loopback Interface 1
23...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #4
56...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #3
42...00 00 00 00 00 00 00 e0 Teredo Tunneling Pseudo-Interface
===========================================================================
IPv4 Route Table
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 10.0.0.1 10.0.0.49 10
10.0.0.0 255.255.255.0 On-link 10.0.0.49 266
10.0.0.49 255.255.255.255 On-link 10.0.0.49 266
10.0.0.255 255.255.255.255 On-link 10.0.0.49 266
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
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 10.0.0.49 266
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 10.0.0.49 266
===========================================================================
Persistent Routes:
None
连接到 VPN 后（短暂），添加 VPN 适配器：
Ethernet adapter Local Area Connection 2:
Connection-specific DNS Suffix . : INS.INSURITY.NET
Description . . . . . . . . . . . : Cisco AnyConnect Secure Mobility Client V
irtual Miniport Adapter for Windows x64
Physical Address. . . . . . . . . : 00-05-9A-3C-7A-00
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::256f:91f:8caf:be2c%25(Preferred)
Link-local IPv6 Address . . . . . : fe80::2c78:328e:3048:7269%25(Preferred)
IPv4 Address. . . . . . . . . . . : 172.23.240.224(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.252.0
Default Gateway . . . . . . . . . : ::
172.23.240.1
DNS Servers . . . . . . . . . . . : 172.25.159.139
172.25.159.221
Primary WINS Server . . . . . . . : 172.25.159.220
Secondary WINS Server . . . . . . : 172.25.159.221
NetBIOS over Tcpip. . . . . . . . : Enabled
路线如下：
===========================================================================
Interface List
25...00 05 9a 3c 7a 00 ......Cisco AnyConnect Secure Mobility Client Virtual Mi
niport Adapter for Windows x64
55...68 05 ca 24 f6 f9 ......Intel(R) Gigabit CT Desktop Adapter
26...38 59 f9 6a 55 59 ......Microsoft Virtual WiFi Miniport Adapter
12...38 59 f9 6a 55 59 ......DW1501 Wireless-N WLAN Half-Mini Card
1...........................Software Loopback Interface 1
23...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #4
41...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #2
56...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #3
42...00 00 00 00 00 00 00 e0 Teredo Tunneling Pseudo-Interface
===========================================================================
IPv4 Route Table
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 10.0.0.1 10.0.0.49 10
0.0.0.0 0.0.0.0 172.23.240.1 172.23.240.224 2
4.30.219.65 255.255.255.255 10.0.0.1 10.0.0.49 11
10.0.0.1 255.255.255.255 On-link 10.0.0.49 11
10.0.0.49 255.255.255.255 On-link 10.0.0.49 266
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
172.23.240.0 255.255.252.0 On-link 172.23.240.224 257
172.23.240.224 255.255.255.255 On-link 172.23.240.224 257
172.23.243.255 255.255.255.255 On-link 172.23.240.224 257
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 10.0.0.49 266
224.0.0.0 240.0.0.0 On-link 172.23.240.224 257
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 10.0.0.49 266
255.255.255.255 255.255.255.255 On-link 172.23.240.224 257
===========================================================================
Persistent Routes:
Network Address Netmask Gateway Address Metric
0.0.0.0 0.0.0.0 172.23.240.1 1
===========================================================================
路线如下：
IPv4 Route Table
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
10.0.0.0 255.255.255.0 On-link 10.0.0.49 266
10.0.0.49 255.255.255.255 On-link 10.0.0.49 266
10.0.0.255 255.255.255.255 On-link 10.0.0.49 266
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
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 10.0.0.49 266
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 10.0.0.49 266
===========================================================================
Persistent Routes:
None
此时，我已经丢失了默认网关和 Internet 连接。同样，如果我使用无线适配器连接，则断开 VPN 连接后不会丢失默认网关。以下是无线适配器的设置：
Wireless LAN adapter Wireless Network Connection:
Connection-specific DNS Suffix . : hsd1.ct.comcast.net
Description . . . . . . . . . . . : DW1501 Wireless-N WLAN Half-Mini Card
Physical Address. . . . . . . . . : 38-59-F9-6A-55-59
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::5932:84c:e3f5:5eae%12(Preferred)
IPv4 Address. . . . . . . . . . . : 10.0.0.94(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Saturday, July 19, 2014 9:59:29 PM
Lease Expires . . . . . . . . . . : Sunday, July 27, 2014 12:09:21 AM
Default Gateway . . . . . . . . . : 10.0.0.1
DHCP Server . . . . . . . . . . . : 10.0.0.1
DHCPv6 IAID . . . . . . . . . . . : 221796857
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-15-C5-00-D6-18-03-73-AE-4A-21
DNS Servers . . . . . . . . . . . : 75.75.75.75
75.75.76.76
NetBIOS over Tcpip. . . . . . . . : Enabled
对于是什么配置设置导致了这种情况，您有什么想法吗？