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我使用以下命令安装了 Cisco 兼容 VPN：
sudo apt install vpnc network-manager-vpnc network-manager-vpnc-gnome
我已经设置了凭据并尝试连接，但我只能通过 VPN 访问几个可用的网站。如果我尝试使用 Windows 上的 Cisco VPN 客户端进行连接，网站就可以正常工作。
你能帮我找出问题所在吗？我该如何解决这个问题？
Windows IP 配置
Host Name . . . . . . . . . . . . : DESKTOP-PCM1MKP
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
Ethernet adapter vEthernet (DockerNAT):
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Hyper-V Virtual Ethernet Adapter #2
Physical Address. . . . . . . . . : 00-15-5D-DE-E9-00
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::60c2:d3ee:63ce:7279%23(Preferred)
IPv4 Address. . . . . . . . . . . : 10.0.75.1(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :
DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Enabled
Wireless LAN adapter Local Area Connection* 1:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Wi-Fi Direct Virtual Adapter
Physical Address. . . . . . . . . : 98-3B-8F-77-20-5F
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Wireless LAN adapter Local Area Connection* 2:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Wi-Fi Direct Virtual Adapter #2
Physical Address. . . . . . . . . : 9A-3B-8F-77-20-5E
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Ethernet adapter Ethernet 3:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Cisco Systems VPN Adapter for 64-bit Windows
Physical Address. . . . . . . . . : 00-05-9A-3C-78-00
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::c400:bb69:cdab:6249%16(Preferred)
IPv4 Address. . . . . . . . . . . : 172.17.2.192(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . : 172.17.0.1
DHCPv6 IAID . . . . . . . . . . . : 738198938
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-24-15-96-AB-9C-EB-E8-39-2E-14
DNS Servers . . . . . . . . . . . : 62.217.251.212
62.217.251.199
NetBIOS over Tcpip. . . . . . . . : Enabled
Wireless LAN adapter Wi-Fi:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) Wireless-AC 9560
Physical Address. . . . . . . . . : 98-3B-8F-77-20-5E
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2a02:2f04:131:7700:e559:5591:1190:f544(Preferred)
Temporary IPv6 Address. . . . . . : 2a02:2f04:131:7700:58b3:3010:83a1:2de9(Preferred)
Link-local IPv6 Address . . . . . : fe80::e559:5591:1190:f544%5(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.100.19(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Tuesday, May 28, 2019 3:52:39 PM
Lease Expires . . . . . . . . . . : Friday, May 31, 2019 3:53:32 PM
Default Gateway . . . . . . . . . : fe80::1%5
192.168.100.1
DHCP Server . . . . . . . . . . . : 192.168.100.1
DHCPv6 IAID . . . . . . . . . . . : 77085583
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-24-15-96-AB-9C-EB-E8-39-2E-14
DNS Servers . . . . . . . . . . . : fe80::1%5
192.168.100.1
NetBIOS over Tcpip. . . . . . . . : Enabled
Ethernet adapter vEthernet (Default Switch):
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Hyper-V Virtual Ethernet Adapter
Physical Address. . . . . . . . . : 02-15-5D-9E-C2-29
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::a1b0:ce:329:fce2%29(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.168.129(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.240
Default Gateway . . . . . . . . . :
DHCPv6 IAID . . . . . . . . . . . : 486544733
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-24-15-96-AB-9C-EB-E8-39-2E-14
DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Enabled
输出 ifconfig 输出：
tun0:
GENERAL.DEVICE: tun0
GENERAL.TYPE: tun
GENERAL.HWADDR: (unknown)
GENERAL.MTU: 1412
GENERAL.STATE: 100 (connected)
GENERAL.CONNECTION: tun0
GENERAL.CON-PATH: /org/freedesktop/NetworkManager/ActiveConnection/10
IP4.ADDRESS[1]: 172.17.2.198/24
IP4.GATEWAY: 0.0.0.0
IP4.ROUTE[1]: dst = 0.0.0.0/0, nh = 0.0.0.0, mt = 50
IP4.ROUTE[2]: dst = 172.17.2.0/24, nh = 0.0.0.0, mt = 50
IP6.ADDRESS[1]: fe80::7ceb:42f2:1066:ec61/64
IP6.GATEWAY: --
IP6.ROUTE[1]: dst = ff00::/8, nh = ::, mt = 256, table=255
IP6.ROUTE[2]: dst = fe80::/64, nh = ::, mt = 256
docker0:
GENERAL.DEVICE: docker0
GENERAL.TYPE: bridge
GENERAL.HWADDR: 02:42:4E:63:79:6E
GENERAL.MTU: 1500
GENERAL.STATE: 100 (connected)
GENERAL.CONNECTION: docker0
GENERAL.CON-PATH: /org/freedesktop/NetworkManager/ActiveConnection/2
IP4.ADDRESS[1]: 172.17.0.1/16
IP4.GATEWAY: --
IP4.ROUTE[1]: dst = 172.17.0.0/16, nh = 0.0.0.0, mt = 0
IP6.ADDRESS[1]: fe80::42:4eff:fe63:796e/64
IP6.GATEWAY: --
IP6.ROUTE[1]: dst = ff00::/8, nh = ::, mt = 256, table=255
IP6.ROUTE[2]: dst = fe80::/64, nh = ::, mt = 256
wlp2s0
GENERAL.DEVICE: wlp2s0
GENERAL.TYPE: wifi
GENERAL.HWADDR: 9C:B6:D0:D9:1A:E9
GENERAL.MTU: 1500
GENERAL.STATE: 100 (connected)
GENERAL.CONNECTION: Wifi Home
GENERAL.CON-PATH: /org/freedesktop/NetworkManager/ActiveConnection/1
IP4.ADDRESS[1]: 192.168.0.104/24
IP4.GATEWAY: 192.168.0.1
IP4.ROUTE[1]: dst = 192.168.0.1/32, nh = 0.0.0.0, mt = 600
IP4.ROUTE[2]: dst = 62.217.213.233/32, nh = 192.168.0.1, mt = 600
IP4.ROUTE[3]: dst = 0.0.0.0/0, nh = 192.168.0.1, mt = 600
IP4.ROUTE[4]: dst = 192.168.0.0/24, nh = 0.0.0.0, mt = 600
IP4.ROUTE[5]: dst = 169.254.0.0/16, nh = 0.0.0.0, mt = 1000
IP4.DNS[1]: 192.168.0.1
IP6.ADDRESS[1]: fe80::7493:61eb:a777:afde/64
IP6.GATEWAY: --
IP6.ROUTE[1]: dst = ff00::/8, nh = ::, mt = 256, table=255
IP6.ROUTE[2]: dst = fe80::/64, nh = ::, mt = 256
IP6.ROUTE[3]: dst = fe80::/64, nh = ::, mt = 600
veth9b0ca8a
GENERAL.DEVICE: veth9b0ca8a
GENERAL.TYPE: ethernet
GENERAL.HWADDR: D2:C4:A5:AC:C3:17
GENERAL.MTU: 1500
GENERAL.STATE: 10 (unmanaged)
GENERAL.CONNECTION: --
GENERAL.CON-PATH: --
WIRED-PROPERTIES.CARRIER: on
谢谢