我最近在我的 Windows 7 64 位元電腦上安裝了英特爾千兆位元 CT 網路介面卡。之前，我使用無線連線和 Cisco AnyConnect VPN 用戶端版本 3.1.0165。在工作中嘗試連接 VPN 時，我先連接成功，但隨後斷開連接並且無法重新連接。這是我們的 Cisco 伺服器的已知問題。它總是會斷開連接，然後在最初幾分鐘內重新連接。如果我使用無線連接連接到家中的路由器，則一切正常。它會斷開連接，然後自動重新連接並保持連接狀態。但如果我使用新的英特爾適配器進行連接，則無法重新連接。我追蹤到這個問題是因為當 Cisco 用戶端斷開連線時，它會刪除我的預設閘道路由。我無法弄清楚為什麼只有當我透過乙太網路適配器而不是透過無線連接時才會這樣做。我已經嘗試卸載並重新安裝網卡驅動程式。之後唯一有幫助的是停用然後啟用後置適配器，但這對重新連接到 VPN 沒有幫助。以下是連接 VPN 之前的設定和路由：
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
路線：
===========================================================================
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
連接到 VPN（短暫）後，將新增 VPN 適配器：
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
路線如下：
===========================================================================
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
===========================================================================
路線如下：
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
此時我已經失去了預設網關和網路連線。同樣，如果我使用無線適配器連接，則在與 VPN 斷開連接後，預設網關不會丟失。以下是無線適配器的設定：
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
關於什麼配置設定導致此問題的任何想法？