在ASA 9.X上配置AnyConnect VPN客户端U-turn流量

输入URL后，浏览器会连接到该接口并显示登录屏幕。

如果用户满足登录和身份验证要求，并且安全设备将用户识别为需要客户端，则它会下载与远程计算机的操作系统匹配的客户端。

下载后，客户端将自行安装和配置，建立安全SSL连接，并在连接终止时保留或卸载自身（这取决于安全设备配置）。

如果以前安装了客户端，则当用户验证身份时，安全设备将会检查客户端的版本，并根据需要升级客户端。

当客户端与安全设备协商SSL VPN连接时，它会与传输层安全(TLS)连接，并且还会使用数据报传输层安全(DTLS)。

DTLS可避免与某些SSL连接相关的延迟和带宽问题，并提高对数据包延迟敏感的实时应用的性能。

AnyConnect 客户端可以从安全设备下载，或者可以由系统管理员手动安装到远程 PC 上。

有关如何手动安装客户端的详细信息，请参阅Cisco AnyConnect安全移动客户端管理员指南。

安全设备根据建立连接的用户的组策略或用户名属性下载客户端。

您可以配置安全设备自动下载客户端，或者将其配置为提示远程用户选择是否下载客户端。

在后一种情况下，如果用户不响应，您可以配置安全设备在超时时间后下载客户端或显示登录页。

注：本文档中使用的示例使用IPv4。对于IPv6 U-turn流量，步骤相同，但使用IPv6地址而不是IPv4。

配置U型远程访问流量

本部分提供有关如何配置本文档所述功能的信息。

注意：使用命令参考指南获取有关本节中使用的命令的详细信息。

公共 Internet VPN 的单接口 AnyConnect VPN 客户端的配置示例

网络图

本文档使用以下网络设置：

ASA 9.1(2)版本配置与ASDM 7.1(6)版本

本文档假设基本配置（如接口配置）已经完成并正常运行。

注：请参阅配置管理访问以允许ASDM配置ASA。

注意：在8.0(2)及更高版本中，ASA在外部接口的端口443上同时支持无客户端SSL VPN(WebVPN)会话和ASDM管理会话。在8.0(2)之前的版本中，除非更改端口号，否则不能在同一个ASA接口上启用WebVPN和ASDM。有关详细信息，请参阅在ASA的同一接口上启用ASDM和WebVPN。

要在 ASA 的单接口上配置 SSL VPN，请执行以下步骤：

1. 选择 Configuration > Device Setup > Interfaces 并查看 Enable traffic between two or more hosts connected to the same interface 复选框以允许SSL VPN流量进入和退出同一接口。点击 Apply.

   

   等效 CLI 配置：

   ciscoasa(config)#same-security-traffic permit intra-interface

2. 选择 Configuration > Remote Access VPN > Network (Client) Access > Address Assignment > Address Pools > Add 创建IP地址池 vpnpool.

   

3. 点击 Apply.

   等效 CLI 配置：

   ciscoasa(config)#ip local pool vpnpool 192.168.10.1-192.168.10.254 mask 255.255.255.0

4. 启用 Webvpn。
   1. 选择 Configuration > Remote Access VPN > Network (Client) Access > SSL VPN Connection Profiles 和 Access Interfaces，单击复选框 Allow Access 和 Enable DTLS 外部接口。查看 Enable Cisco AnyConnect VPN Client access on the interfaces selected in the table below 复选框以在外部接口上启用SSL VPN。

      

   2. 点击 Apply.
   3. 选择 Configuration > Remote Access VPN > Network (Client) Access > Anyconnect Client Software > Add 以便从ASA的闪存中添加Cisco AnyConnect VPN客户端映像，如下所示。
      

      

      

      等效 CLI 配置：

      ciscoasa(config)#webvpn
      ciscoasa(config-webvpn)#enable outside
      ciscoasa(config-webvpn)#anyconnect image disk0:/anyconnect-win-3.1.05152-k9.pkg 1
      ciscoasa(config-webvpn)#tunnel-group-list enable
      ciscoasa(config-webvpn)#anyconnect enable

5. 配置组策略。
   1. 选择 Configuration > Remote Access VPN > Network (Client) Access > Group Policies 创建内部组策略 clientgroup.在 General 选项卡，选择 SSL VPN Client 复选框以启用WebVPN作为隧道协议。

      

   2. 如果 Advanced > Split Tunneling 选项卡，选择 Tunnel All Networks 从策略的Policy下拉列表中，使来自远程PC的所有数据包通过安全隧道。

      

      等效 CLI 配置：

      ciscoasa(config)#group-policy clientgroup internal
      ciscoasa(config)#group-policyclientgroup attributes
      ciscoasa(config-group-policy)#vpn-tunnel-protocol ssl-client
      ciscoasa(config-group-policy)#split-tunnel-policy tunnelall

6. 选择 Configuration > Remote Access VPN > AAA/Local Users > Local Users > Add 创建新用户帐户 ssluser1.点击 OK 然后 Apply.

   

   等效 CLI 配置：

   ciscoasa(config)#username ssluser1 password asdmASA@

7. 配置隧道组。
   1. 选择 Configuration > Remote Access VPN > Network (Client) Access > Anyconnect Connection Profiles > Add 以创建新的隧道组 sslgroup.
   2. 如果 Basic 选项卡中，您可以按如下所示执行配置列表：
      • 将隧道组命名为 sslgroup.
      • 低于 Client Address Assignment，选择地址池 vpnpool 从 Client Address Pools 下拉列表。
      • 低于 Default Group Policy，选择组策略 clientgroup 从 Group Policy 下拉列表。

        

      • 在 Advanced  > Group Alias/Group URL 选项卡，将组别名指定为 sslgroup_users 并点击 OK.

        等效 CLI 配置：

        ciscoasa(config)#tunnel-group sslgroup type remote-access
        ciscoasa(config)#tunnel-group sslgroup general-attributes
        ciscoasa(config-tunnel-general)#address-pool vpnpool
        ciscoasa(config-tunnel-general)#default-group-policy clientgroup
        ciscoasa(config-tunnel-general)#exit
        ciscoasa(config)#tunnel-group sslgroup webvpn-attributes
        ciscoasa(config-tunnel-webvpn)#group-alias sslgroup_users enable

8. 配置 NAT
   1. 选择 Configuration > Firewall > NAT Rules > Add "Network Object" NAT Rule 以便来自内部网络的流量可以使用外部IP地址172.16.1.1进行转换。

      

      
   2. 选择 Configuration > Firewall > NAT Rules > Add "Network Object" NAT Rule 因此，来自外部网络的VPN流量可以使用外部IP地址172.16.1.1进行转换。

      

      等效 CLI 配置：

      ciscoasa(config)# object network obj-inside
      ciscoasa(config-network-object)# subnet 10.77.241.128 255.255.255.192
      ciscoasa(config-network-object)# nat (inside,outside) dynamic interface
      
      ciscoasa(config)# object network obj-AnyconnectPool
      ciscoasa(config-network-object)# subnet 192.168.10.0 255.255.255.0
      ciscoasa(config-network-object)# nat (outside,outside) dynamic interface

CLI中的ASA 9.1(2)版配置

ciscoasa(config)#show running-config
: Saved
:
ASA Version 9.1(2)
!
hostname ciscoasa
domain-name default.domain.invalid
enable password 8Ry2YjIyt7RRXU24 encrypted
names
!
interface GigabitEthernet0/0
 nameif outside
 security-level 0
 ip address 172.16.1.1 255.255.255.0
!
interface GigabitEthernet0/1
 nameif inside
 security-level 100
 ip address 10.77.241.142 255.255.255.192
!
interface Management0/0
 shutdown
 no nameif
 no security-level
 no ip address

!
passwd 2KFQnbNIdI.2KYOU encrypted
boot system disk0:/asa802-k8.bin
ftp mode passive
clock timezone IST 5 30
dns server-group DefaultDNS
 domain-name default.domain.invalid
same-security-traffic permit intra-interface

!--- Command that permits the SSL VPN traffic to enter and exit the same interface.

object network obj-AnyconnectPool
 subnet 192.168.10.0 255.255.255.0 
object network obj-inside
 subnet 10.77.241.128 255.255.255.192

!--- Commands that define the network objects we will use later on the NAT section.

pager lines 24
logging enable
logging asdm informational
mtu inside 1500
mtu outside 1500
ip local pool vpnpool 192.168.10.1-192.168.10.254 mask 255.255.255.0


!--- The address pool for the Cisco AnyConnect SSL VPN Clients


no failover
icmp unreachable rate-limit 1 burst-size 1
asdm image disk0:/asdm-602.bin
no asdm history enable
arp timeout 14400

nat (inside,outside) source static obj-inside obj-inside destination static
 obj-AnyconnectPool obj-AnyconnectPool

!--- The Manual NAT that prevents the inside network from getting translated
 when going to the Anyconnect Pool.

object network obj-AnyconnectPool
 nat (outside,outside) dynamic interface
object network obj-inside
 nat (inside,outside) dynamic interface

!--- The Object NAT statements for Internet access used by inside users and
 Anyconnect Clients. 
!--- Note: Uses an RFC 1918 range for lab setup. 

route outside 0.0.0.0 0.0.0.0 172.16.1.2 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout uauth 0:05:00 absolute
dynamic-access-policy-record DfltAccessPolicy
http server enable
http 0.0.0.0 0.0.0.0 inside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
no crypto isakmp nat-traversal
telnet timeout 5
ssh timeout 5
console timeout 0
threat-detection basic-threat
threat-detection statistics access-list
!
class-map inspection_default
 match default-inspection-traffic
!
!
policy-map type inspect dns preset_dns_map
 parameters
  message-length maximum 512
policy-map global_policy
 class inspection_default
  inspect dns preset_dns_map
  inspect ftp
  inspect h323 h225
  inspect h323 ras
  inspect netbios
  inspect rsh
  inspect rtsp
  inspect skinny
  inspect esmtp
  inspect sqlnet
  inspect sunrpc
  inspect tftp
  inspect sip
  inspect xdmcp
!
service-policy global_policy global
webvpn
 enable outside


!--- Enable WebVPN on the outside interface


 anyconnect image disk0:/anyconnect-win-3.1.05152-k9.pkg 1


!--- Assign an order to the AnyConnect SSL VPN Client image

 
anyconnect enable


!--- Enable the security appliance to download SVC images to remote computers

 
tunnel-group-list enable


!--- Enable the display of the tunnel-group list on the WebVPN Login page


group-policy clientgroup internal


!--- Create an internal group policy "clientgroup"


group-policy clientgroup attributes
 vpn-tunnel-protocol ssl-client


!--- Specify SSL as a permitted VPN tunneling protocol


split-tunnel-policy tunnelall


!--- Encrypt all the traffic from the SSL VPN Clients.

username ssluser1 password ZRhW85jZqEaVd5P. encrypted


!--- Create a user account "ssluser1"


tunnel-group sslgroup type remote-access


!--- Create a tunnel group "sslgroup" with type as remote access


tunnel-group sslgroup general-attributes
 address-pool vpnpool


!--- Associate the address pool vpnpool created


 default-group-policy clientgroup


!--- Associate the group policy "clientgroup" created


tunnel-group sslgroup webvpn-attributes
 group-alias sslgroup_users enable


!--- Configure the group alias as sslgroup-users

prompt hostname context
Cryptochecksum:af3c4bfc4ffc07414c4dfbd29c5262a9
: end
ciscoasa(config)#

使用已建立的TunnelAll配置允许AnyConnect VPN客户端之间的通信

网络图

如果需要Anyconnect客户端之间的通信，并且单臂公共互联网的NAT已经就位；还需要手动NAT以允许双向通信。

这是Anyconnect客户端使用电话服务且必须能够相互呼叫的常见情况。

ASA 9.1(2)版本配置与ASDM 7.1(6)版本

选择 Configuration > Firewall > NAT Rules > Add NAT Rule Before "Network Object" NAT Rules 以便从外部网络（Anyconnect池）发往来自同一池的另一个Anyconnect客户端的流量不会转换为外部IP地址172.16.1.1。

等效 CLI 配置：

nat (outside,outside) source static obj-AnyconnectPool obj-AnyconnectPool destination
 static obj-AnyconnectPool obj-AnyconnectPool

CLI中的ASA 9.1(2)版配置

ciscoasa(config)#show running-config
: Saved
:
ASA Version 9.1(2)
!
hostname ciscoasa
domain-name default.domain.invalid
enable password 8Ry2YjIyt7RRXU24 encrypted
names
!
interface GigabitEthernet0/0
 nameif outside
 security-level 0
 ip address 172.16.1.1 255.255.255.0
!
interface GigabitEthernet0/1
 nameif inside
 security-level 100
 ip address 10.77.241.142 255.255.255.192
!
interface Management0/0
 shutdown
 no nameif
 no security-level
 no ip address

!
passwd 2KFQnbNIdI.2KYOU encrypted
boot system disk0:/asa802-k8.bin
ftp mode passive
clock timezone IST 5 30
dns server-group DefaultDNS
 domain-name default.domain.invalid
same-security-traffic permit intra-interface

!--- Command that permits the SSL VPN traffic to enter and exit the same interface.

object network obj-AnyconnectPool
 subnet 192.168.10.0 255.255.255.0
object network obj-inside
 subnet 10.77.241.128 255.255.255.192

!--- Commands that define the network objects we will use later on the NAT section.

pager lines 24
logging enable
logging asdm informational
mtu inside 1500
mtu outside 1500
ip local pool vpnpool 192.168.10.1-192.168.10.254 mask 255.255.255.0


!--- The address pool for the Cisco AnyConnect SSL VPN Clients


no failover
icmp unreachable rate-limit 1 burst-size 1
asdm image disk0:/asdm-602.bin
no asdm history enable
arp timeout 14400

nat (inside,outside) source static obj-inside obj-inside destination static
 obj-AnyconnectPool obj-AnyconnectPool
nat (outside,outside) source static obj-AnyconnectPool obj-AnyconnectPool
 destination static obj-AnyconnectPool obj-AnyconnectPool 

!--- The Manual NAT statements used so that traffic from the inside network
 destined to the Anyconnect Pool and traffic from the Anyconnect Pool destined
 to another Client within the same pool does not get translated. 

object network obj-AnyconnectPool
 nat (outside,outside) dynamic interface
object network obj-inside
 nat (inside,outside) dynamic interface

!--- The Object NAT statements for Internet access used by inside users and
 Anyconnect Clients. 
!--- Note: Uses an RFC 1918 range for lab setup. 

route outside 0.0.0.0 0.0.0.0 172.16.1.2 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout uauth 0:05:00 absolute
dynamic-access-policy-record DfltAccessPolicy
http server enable
http 0.0.0.0 0.0.0.0 inside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
no crypto isakmp nat-traversal
telnet timeout 5
ssh timeout 5
console timeout 0
threat-detection basic-threat
threat-detection statistics access-list
!
class-map inspection_default
 match default-inspection-traffic
!
!
policy-map type inspect dns preset_dns_map
 parameters
  message-length maximum 512
policy-map global_policy
 class inspection_default
  inspect dns preset_dns_map
  inspect ftp
  inspect h323 h225
  inspect h323 ras
  inspect netbios
  inspect rsh
  inspect rtsp
  inspect skinny
  inspect esmtp
  inspect sqlnet
  inspect sunrpc
  inspect tftp
  inspect sip
  inspect xdmcp
!
service-policy global_policy global
webvpn
 enable outside


!--- Enable WebVPN on the outside interface


 anyconnect image disk0:/anyconnect-win-3.1.05152-k9.pkg 1


!--- Assign an order to the AnyConnect SSL VPN Client image

 
anyconnect enable


!--- Enable the security appliance to download SVC images to remote computers

 
tunnel-group-list enable


!--- Enable the display of the tunnel-group list on the WebVPN Login page


group-policy clientgroup internal


!--- Create an internal group policy "clientgroup"


group-policy clientgroup attributes
 vpn-tunnel-protocol ssl-client


!--- Specify SSL as a permitted VPN tunneling protocol


split-tunnel-policy tunnelall


!--- Encrypt all the traffic from the SSL VPN Clients.

username ssluser1 password ZRhW85jZqEaVd5P. encrypted


!--- Create a user account "ssluser1"


tunnel-group sslgroup type remote-access


!--- Create a tunnel group "sslgroup" with type as remote access


tunnel-group sslgroup general-attributes
 address-pool vpnpool


!--- Associate the address pool vpnpool created


 default-group-policy clientgroup


!--- Associate the group policy "clientgroup" created


tunnel-group sslgroup webvpn-attributes
 group-alias sslgroup_users enable


!--- Configure the group alias as sslgroup-users

prompt hostname context
Cryptochecksum:af3c4bfc4ffc07414c4dfbd29c5262a9
: end
ciscoasa(config)#

允许使用拆分隧道在AnyConnect VPN客户端之间进行通信

网络图

如果需要Anyconnect客户端之间的通信且使用了拆分隧道，则无需手动NAT即可允许双向通信，除非已配置影响此流量的NAT规则。

但是，Anyconnect VPN池必须包含在分割隧道ACL中。

这是Anyconnect客户端使用电话服务且必须能够相互呼叫的常见情况。

ASA 9.1(2)版本配置与ASDM 7.1(6)版本

1. 选择 Configuration > Remote Access VPN > Network (Client) Access > Address Assignment> Address Pools > Add 创建IP地址池 vpnpool.

   

2. 点击 Apply.

   等效 CLI 配置：

   ciscoasa(config)#ip local pool vpnpool 192.168.10.1-192.168.10.254 mask 255.255.255.0

3. 启用 Webvpn。
   1. 选择 Configuration > Remote Access VPN > Network (Client) Access > SSL VPN Connection Profiles 和 Access Interfaces，单击复选框 Allow Access 和 Enable DTLS 外部接口。此外，请查看 Enable Cisco AnyConnect VPN Client access on the interfaces selected in the table below 复选框以在外部接口上启用SSL VPN。

      

   2. 点击 Apply.
   3. 选择 Configuration > Remote Access VPN > Network (Client) Access > Anyconnect Client Software > Add 以便从ASA的闪存中添加Cisco AnyConnect VPN客户端映像，如下所示。
      
      

      

      
      
      

      

      等效 CLI 配置：

      ciscoasa(config)#webvpn
      ciscoasa(config-webvpn)#enable outside
      ciscoasa(config-webvpn)#anyconnect image disk0:/anyconnect-win-3.1.05152-k9.pkg 1
      ciscoasa(config-webvpn)#tunnel-group-list enable
      ciscoasa(config-webvpn)#anyconnect enable

4. 配置组策略。
   1. 选择 Configuration > Remote Access VPN > Network (Client) Access > Group Policies 创建内部组策略 clientgroup.在 General 选项卡，选择 SSL VPN Client 复选框以启用WebVPN作为允许的隧道协议。

      

   2. 如果 Advanced > Split Tunneling 选项卡，选择 Tunnel Network List Below 从策略(Policy)下拉列表中，使来自远程PC的所有数据包通过安全隧道。

      等效 CLI 配置：

      ciscoasa(config)#access-list SPLIt-ACL standard permit 10.77.241.0 255.255.255.0
      ciscoasa(config)#access-list SPLIt-ACL standard permit 192.168.10.0 255.255.255.0
      
      ciscoasa(config)#group-policy clientgroup internal
      ciscoasa(config)#group-policy clientgroup attributes
      ciscoasa(config-group-policy)#vpn-tunnel-protocol ssl-client
      ciscoasa(config-group-policy)#split-tunnel-policy tunnelspecified
      ciscoasa(config-group-policy)#split-tunnel-network-list SPLIt-ACL

5. 选择 Configuration > Remote Access VPN > AAA/Local Users > Local Users > Add 创建新用户帐户 ssluser1.点击 OK 然后 Apply.

   

   等效 CLI 配置：

   ciscoasa(config)#username ssluser1 password asdmASA@

6. 配置隧道组。
   1. 选择 Configuration > Remote Access VPN > Network (Client) Access > Anyconnect Connection Profiles > Add 以创建新的隧道组 sslgroup.
   2. 如果 Basic 选项卡中，您可以按如下所示执行配置列表：
      • 将隧道组命名为 sslgroup.
      • 低于 Client Address Assignment，选择地址池 vpnpool 从 Client Address Pools 下拉列表。
      • 低于 Default Group Policy，选择组策略 clientgroup 从 Group Policy 下拉列表。

        

      • 在 Advanced > Group Alias/Group URL 选项卡，将组别名指定为 sslgroup_users 并点击 OK.

        等效 CLI 配置：

        ciscoasa(config)#tunnel-group sslgroup type remote-access
        ciscoasa(config)#tunnel-group sslgroup general-attributes
        ciscoasa(config-tunnel-general)#address-pool vpnpool
        ciscoasa(config-tunnel-general)#default-group-policy clientgroup
        ciscoasa(config-tunnel-general)#exit
        ciscoasa(config)#tunnel-group sslgroup webvpn-attributes
        ciscoasa(config-tunnel-webvpn)#group-alias sslgroup_users enable

CLI中的ASA 9.1(2)版配置

ciscoasa(config)#show running-config
: Saved
:
ASA Version 9.1(2)
!
hostname ciscoasa
domain-name default.domain.invalid
enable password 8Ry2YjIyt7RRXU24 encrypted
names
!
interface GigabitEthernet0/0
 nameif outside
 security-level 0
 ip address 172.16.1.1 255.255.255.0
!
interface GigabitEthernet0/1
 nameif inside
 security-level 100
 ip address 10.77.241.142 255.255.255.192
!
interface Management0/0
 shutdown
 no nameif
 no security-level
 no ip address

!
passwd 2KFQnbNIdI.2KYOU encrypted
boot system disk0:/asa802-k8.bin
ftp mode passive
clock timezone IST 5 30
dns server-group DefaultDNS
 domain-name default.domain.invalid
same-security-traffic permit intra-interface

!--- Command that permits the SSL VPN traffic to enter and exit the same interface.

object network obj-inside
 subnet 10.77.241.128 255.255.255.192

!--- Commands that define the network objects we will use later on the NAT section.

access-list SPLIt-ACL standard permit 10.77.241.0 255.255.255.0
access-list SPLIt-ACL standard permit 192.168.10.0 255.255.255.0

!--- Standard Split-Tunnel ACL that determines the networks that should travel the
 Anyconnect tunnel.

pager lines 24
logging enable
logging asdm informational
mtu inside 1500
mtu outside 1500
ip local pool vpnpool 192.168.10.1-192.168.10.254 mask 255.255.255.0

!--- The address pool for the Cisco AnyConnect SSL VPN Clients

no failover
icmp unreachable rate-limit 1 burst-size 1
asdm image disk0:/asdm-602.bin
no asdm history enable
arp timeout 14400

nat (inside,outside) source static obj-inside obj-inside destination static
 obj-AnyconnectPool obj-AnyconnectPool

!--- The Manual NAT that prevents the inside network from getting translated when
 going to the Anyconnect Pool
 
object network obj-inside
 nat (inside,outside) dynamic interface

!--- The Object NAT statements for Internet access used by inside users. 
!--- Note: Uses an RFC 1918 range for lab setup. 

route outside 0.0.0.0 0.0.0.0 172.16.1.2 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout uauth 0:05:00 absolute
dynamic-access-policy-record DfltAccessPolicy
http server enable
http 0.0.0.0 0.0.0.0 inside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
no crypto isakmp nat-traversal
telnet timeout 5
ssh timeout 5
console timeout 0
threat-detection basic-threat
threat-detection statistics access-list
!
class-map inspection_default
 match default-inspection-traffic
!
!
policy-map type inspect dns preset_dns_map
 parameters
  message-length maximum 512
policy-map global_policy
 class inspection_default
  inspect dns preset_dns_map
  inspect ftp
  inspect h323 h225
  inspect h323 ras
  inspect netbios
  inspect rsh
  inspect rtsp
  inspect skinny
  inspect esmtp
  inspect sqlnet
  inspect sunrpc
  inspect tftp
  inspect sip
  inspect xdmcp
!
service-policy global_policy global
webvpn
 enable outside


!--- Enable WebVPN on the outside interface


 anyconnect image disk0:/anyconnect-win-3.1.05152-k9.pkg 1


!--- Assign an order to the AnyConnect SSL VPN Client image

 
anyconnect enable


!--- Enable the security appliance to download SVC images to remote computers

 
tunnel-group-list enable


!--- Enable the display of the tunnel-group list on the WebVPN Login page


group-policy clientgroup internal


!--- Create an internal group policy "clientgroup"


group-policy clientgroup attributes
 vpn-tunnel-protocol ssl-client


!--- Specify SSL as a permitted VPN tunneling protocol


split-tunnel-policy tunnelspecified


!--- Encrypt  only traffic specified on the split-tunnel ACL coming from the SSL
 VPN Clients.


split-tunnel-network-list value SPLIt-ACL


!--- Defines the previosly configured ACL to the split-tunnel policy.

username ssluser1 password ZRhW85jZqEaVd5P. encrypted


!--- Create a user account "ssluser1"


tunnel-group sslgroup type remote-access


!--- Create a tunnel group "sslgroup" with type as remote access


tunnel-group sslgroup general-attributes
 address-pool vpnpool


!--- Associate the address pool vpnpool created


 default-group-policy clientgroup


!--- Associate the group policy "clientgroup" created


tunnel-group sslgroup webvpn-attributes
 group-alias sslgroup_users enable


!--- Configure the group alias as sslgroup-users

prompt hostname context
Cryptochecksum:af3c4bfc4ffc07414c4dfbd29c5262a9
: end
ciscoasa(config)#

验证

使用本部分可确认配置能否正常运行。

• show vpn-sessiondb svc — 显示有关当前SSL连接的信息。

  ciscoasa#show vpn-sessiondb anyconnect
  
  Session Type: SVC
  
  Username     : ssluser1               Index        : 12
  Assigned IP  : 192.168.10.1           Public IP    : 192.168.1.1
  Protocol     : Clientless SSL-Tunnel DTLS-Tunnel
  Encryption   : RC4 AES128             Hashing      : SHA1
  Bytes Tx     : 194118                 Bytes Rx     : 197448
  Group Policy : clientgroup            Tunnel Group : sslgroup
  Login Time   : 17:12:23 IST Mon Mar 24 2008
  Duration     : 0h:12m:00s
  NAC Result   : Unknown
  VLAN Mapping : N/A                    VLAN         : none

• show webvpn group-alias — 显示各种组的已配置别名。

  ciscoasa#show webvpn group-alias
  Tunnel Group: sslgroup   Group Alias: sslgroup_users enabled

• 在ASDM中，选择 Monitoring > VPN > VPN Statistics > Sessions 以便了解ASA中的当前会话。

  

故障排除

本部分提供的信息可用于对配置进行故障排除。

• vpn-sessiondb logoff name — 命令注销特定用户名的SSL VPN会话。

  ciscoasa#vpn-sessiondb logoff name ssluser1
  Do you want to logoff the VPN session(s)? [confirm] Y
  INFO: Number of sessions with name "ssluser1" logged off : 1
  
  ciscoasa#Called vpn_remove_uauth: success!
  webvpn_svc_np_tear_down: no ACL
  webvpn_svc_np_tear_down: no IPv6 ACL
  np_svc_destroy_session(0xB000)

  同样，您可以使用 vpn-sessiondb logoff anyconnect 命令，以终止所有AnyConnect会话。

• debug webvpn anyconnect <1-255> — 提供实时webvpn事件以建立会话。

  Ciscoasa#debug webvpn anyconnect 7
  
  CSTP state = HEADER_PROCESSING
  http_parse_cstp_method()
  ...input: 'CONNECT /CSCOSSLC/tunnel HTTP/1.1'
  webvpn_cstp_parse_request_field()
  ...input: 'Host: 10.198.16.132'
  Processing CSTP header line: 'Host: 10.198.16.132'
  webvpn_cstp_parse_request_field()
  ...input: 'User-Agent: Cisco AnyConnect VPN Agent for Windows 3.1.05152'
  Processing CSTP header line: 'User-Agent: Cisco AnyConnect VPN Agent for Windows
  3.1.05152'
  Setting user-agent to: 'Cisco AnyConnect VPN Agent for Windows 3.1.05152'
  webvpn_cstp_parse_request_field()
  ...input: 'Cookie: webvpn=146E70@20480@567F@50A0DFF04AFC2411E0DD4F681D330922F4B21F60'
  Processing CSTP header line: 'Cookie: webvpn=
  146E70@20480@567F@50A0DFF04AFC2411E0DD4F681D330922F4B21F60'
  Found WebVPN cookie: 'webvpn=146E70@20480@567F@50A0DFF04AFC2411E0DD4F681D330922F4B21F60'
  WebVPN Cookie: 'webvpn=146E70@20480@567F@50A0DFF04AFC2411E0DD4F681D330922F4B21F60'
  webvpn_cstp_parse_request_field()
  ...input: 'X-CSTP-Version: 1'
  Processing CSTP header line: 'X-CSTP-Version: 1'
  Setting version to '1'
  webvpn_cstp_parse_request_field()
  ...input: 'X-CSTP-Hostname: WCRSJOW7Pnbc038'
  Processing CSTP header line: 'X-CSTP-Hostname: WCRSJOW7Pnbc038'
  Setting hostname to: 'WCRSJOW7Pnbc038'
  webvpn_cstp_parse_request_field()
  ...input: 'X-CSTP-MTU: 1280'
  Processing CSTP header line: 'X-CSTP-MTU: 1280'
  webvpn_cstp_parse_request_field()
  ...input: 'X-CSTP-Address-Type: IPv6,IPv4'
  Processing CSTP header line: 'X-CSTP-Address-Type: IPv6,IPv4'
  webvpn_cstp_parse_request_field()
  webvpn_cstp_parse_request_field()
  ...input: 'X-CSTP-Base-MTU: 1300'
  Processing CSTP header line: 'X-CSTP-Base-MTU: 1300'
  webvpn_cstp_parse_request_field()
  webvpn_cstp_parse_request_field()
  ...input: 'X-CSTP-Full-IPv6-Capability: true'
  Processing CSTP header line: 'X-CSTP-Full-IPv6-Capability: true'
  webvpn_cstp_parse_request_field()
  ...input: 'X-DTLS-Master-Secret: F1810A764A0646376F7D254202A0A602CF075972F91EAD1
  9BB6BE387BB8C6F893BFB49886D47F9A4BE2EA2A030BF620D'
  Processing CSTP header line: 'X-DTLS-Master-Secret: F1810A764A0646376F7D254202A0
  A602CF075972F91EAD19BB6BE387BB8C6F893BFB49886D47F9A4BE2EA2A030BF620D'
  webvpn_cstp_parse_request_field()
  ...input: 'X-DTLS-CipherSuite: AES256-SHA:AES128-SHA:DES-CBC3-SHA:DES-CBC-SHA'
  Processing CSTP header line: 'X-DTLS-CipherSuite: AES256-SHA:AES128-SHA:DES-CBC3
   -SHA:DES-CBC-SHA'
  webvpn_cstp_parse_request_field()
  ...input: 'X-DTLS-Accept-Encoding: lzs'
  Processing CSTL header line: 'X-DTLS-Accept-Encoding: lzs'
  webvpn_cstp_parse_request_field()
  ...input: 'X-DTLS-Header-Pad-Length: 0'
  webvpn_cstp_parse_request_field()
  ...input: 'X-CSTP-Accept-Encoding: lzs,deflate'
  Processing CSTP header line: 'X-CSTP-Accept-Encoding: lzs,deflate'
  webvpn_cstp_parse_request_field()
  ...input: 'X-CSTP-Protocol: Copyright (c) 2004 Cisco Systems, Inc.'
  Processing CSTP header line: 'X-CSTP-Protocol: Copyright (c) 2004 Cisco Systems, Inc.'
  Validating address: 0.0.0.0
  CSTP state = WAIT_FOR_ADDRESS
  webvpn_cstp_accept_address: 192.168.10.1/255.255.255.0
  webvpn_cstp_accept_ipv6_address: No IPv6 Address
  CSTP state = HAVE_ADDRESS
  SVC: Sent gratuitous ARP for 192.168.10.1.
  SVC: NP setup
  np_svc_create_session(0x5000, 0xa930a180, TRUE)
  webvpn_svc_np_setup
  SVC ACL Name: NULL
  SVC ACL ID: -1
  vpn_put_uauth success for ip 192.168.10.1!
  No SVC ACL
  Iphdr=20 base-mtu=1300 def-mtu=1500 conf-mtu=1406
  tcp-mss = 1260
  path-mtu = 1260(mss)
  mtu = 1260(path-mtu) - 0(opts) - 5(ssl) - 8(cstp) = 1247
  tls-mtu = 1247(mtu) - 20(mac) = 1227
  DTLS Block size = 16
  mtu = 1300(base-mtu) - 20(ip) - 8(udp) - 13(dtlshdr) - 16(dtlsiv) = 1243
  mod-mtu = 1243(mtu) & 0xfff0(complement) = 1232
  dtls-mtu = 1232(mod-mtu) - 1(cdtp) - 20(mac) - 1(pad) = 1210
  computed tls-mtu=1227 dtls-mtu=1210 conf-mtu=1406
  DTLS enabled for intf=2 (outside)
  tls-mtu=1227 dtls-mtu=1210
  SVC: adding to sessmgmt
  
  Unable to initiate NAC, NAC might not be enabled or invalid policy
  CSTP state = CONNECTED
  webvpn_rx_data_cstp
  webvpn_rx_data_cstp: got internal message
  Unable to initiate NAC, NAC might not be enabled or invalid policy

• 在ASDM中，选择 Monitoring > Logging > Real-time Log Viewer > View 以便查看实时事件。此示例显示通过ASA 172.16.1.1在Internet中的AnyConnect 192.168.10.1和Telnet服务器10.2.2.2之间的会话信息。

  

相关信息

• Cisco ASA 5500-X系列防火墙
• 单臂路由器上用于公共 Internet 的 PIX/ASA 和 VPN 客户端配置示例
• 在 ASA 上用 ASDM 配置 SSL VPN Client (SVC) 的示例
• 技术支持和文档 - Cisco Systems