I recently installed Intel Gigabit CT Network Adapter on my Windows 7 64-bit machine. Previously, I was using wireless connection and Cisco AnyConnect VPN client ver 3.1.0165. When trying connect to VPN at work, I am connecting successfully first, but then I get disconnected and fail to reconnect. This is a known issue with our Cisco server. It always disconnects and then reconnects within first couple minutes. If I am connected to my router at home using wireless connection, everything works fine. It gets disconnected and then reconnects automatically and stays connected. But if I am connecting using new Intel adapter, it fails to reconnect. I traced this problem to the fact that when Cisco client disconnects, it removes my default gateway route. I cannot figure out why it doing this only if I am connected through the Ethernet adapter and not through wireless. I already tried uninstalling and reinstalling drivers for the network card. The only thing that helps afterwards is disabling and then enabling back adapter, but it's not helping with re-connecting to VPN. Here is configuration and routes before connecting to VPN:
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
routes:
===========================================================================
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
After it connects to VPN (briefly) the VPN adapter is added:
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
and routes look like this:
===========================================================================
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
===========================================================================
and routes look like this:
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
At this point I already lost default gateway and connection to Internet. Again, if I connect using wireless adapter default gateway is not lost after disconnecting from VPN. Here are setting for wireless adapter:
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
Any ideas on what configuration setting is causing this?