Internet Protocol version 6 (IPv6)

A Citrix ADC appliance supports both server-side and client-side IPv6 and can therefore function as an IPv6 node. It can accept connections from IPv6 nodes (both hosts and routers) and from IPv4 nodes, and can perform Protocol Translation (RFC 2765) before sending traffic to the services.

The following table lists some of the IPv6 features that the Citrix ADC appliance supports.

Table 1. Some Supported IPv6 Features

Implementing IPv6 Support

You must enable IPv6 feature on a Citrix ADC appliance before you can use or configure it. If IPv6 is disabled, the Citrix ADC does not process IPv6 packets. It displays the following warning when you run an unsupported command:

"Warning: Feature(s) not enabled [IPv6PT]" 

Use either of the following procedures to enable or disable IPv6.

CLI procedures

来enable or disable IPv6 by using the CLI:

At the command prompt, type one of the following commands:

• enable ns feature ipv6pt

• disable ns feature ipv6pt

GUI procedures

来enable or disable IPv6 by using the GUI:

1. Navigate toSystem>Settings, in theModes and Featuresgroup, clickConfigure Advanced Features.
2. Select or clear theIPv6 Protocol Translationoption.

VLAN Support

If you need to send broadcast or multicast packets without identifying the VLAN (for example, during DAD for NSIP, or ND6 for the next hop of the route), you can configure the Citrix ADC appliance to send the packet on all the interfaces with appropriate tagging. The VLAN is identified by ND6, and a data packet is sent only on the VLAN. For more information about ND6 and VLANs, seeConfiguring Neighbor Discovery.

Port-based VLANs are common for IPv4 and IPv6. Prefix-based VLANs are supported for IPv6.

Simple Deployment Scenario

Following is an example of a simple load balancing set-up consisting of an IPv6 vserver and IPv4 services, as illustrated in the following topology diagram.

Figure 1. IPv6 Sample Topology

The following table summarizes the names and values of the entities that must be configured on the Citrix ADC.

Table 2. Sample Values for Creating Entities

The following figure shows the entities and values of the parameters to be configured on the Citrix ADC.

Figure 2. IPv6 Entity Diagram

来configure this deployment scenario, you need to do the following:

1. 创建一个IPv6服务。
2. Create an IPv6 LB vserver.
3. Bind the services to the vserver.

CLI procedures

来create IPv4 services by using the CLI:

At the command prompt, type:

• add service
• sh service

Example:

> add service SVC1 10.102.29.1 HTTP 80 Done >add service SVC2 10.102.29.2 HTTP 80 Done 

来create IPv6 vserver by using the CLI:

At the command prompt, type:

• add lb vserver
• sh lb vserver

Example:

> add lb vserver VS1_IPv6 2002::9 HTTP 80 Done 

来bind a service to an LB vserver by using the CLI:

At the command prompt, type:

• bind lb vserver
• sh lb vserver

Example:

> bind lb vserver VS1_IPv6 SVC1 Done 

GUI procedures

来create IPv4 services by using the GUI:

Navigate toTraffic Management>Load Balancing>Services, clickAdd, and then set the following parameters:

• Service Name
• IP Address
• Protocol
• Port

来create IPv6 vserver by using the GUI:

1. Navigate toTraffic Management>Load Balancing>Virtual Servers, clickAdd, and select theIPv6check box.
2. Set the following parameters:
   • Name
   • Protocol
   • IP Address Type
   • IP Address
   • Port

来bind a service to an LB vserver by using the GUI:

1. Navigate toTraffic Management>Load Balancing>Virtual Servers.
2. In theLoad Balancing Virtual Serverspage, select the vserver for which you want to bind the service (for example, VS1_IPv6).
3. ClickOpen.
4. In theConfigure Virtual Server (Load Balancing)dialog box, on theServicestab, select theActivecheck box corresponding to the service that you want to bind to the vserver (for example, SVC1).
5. ClickOK.
6. Repeat steps 1-4 to bind the service (for example, SVC2 to the vserver).

Host Header Modification

When an HTTP request has an IPv6 address in the host header, and the server does not understand the IPv6 address, you must map the IPv6 address to an IPv4 address. The IPv4 address is then used in the host header of the HTTP request sent to the vserver.

CLI procedures

来change the IPv6 address in the host header to an IPv4 address by using the CLI:

At the command prompt, type:

• set ns ip6 -map
• sh ns ip6

Example:

> set ns ip6 2002::9 -map 200.200.200.200 Done 

GUI procedures

来change the IPv6 address in the host header to an IPv4 address by using the GUI:

1. Navigate toSystem>Network>IPsand, on theIPV6stab, select the IP address for which you want to configure a mapped IP address, for example, 2002:0:0:0:0:0:0:9, and click Edit.
2. In theMapped IPtext box, type the mapped IP address that you want to configure, for example, 200.200.200.200.

VIP Insertion

If an IPv6 address is sent to an IPv4-based server, the server may not understand the IP address in the HTTP header, and may generate an error. To avoid this, you can map an IPv4 address to the IPv6 VIP. Then, you can enable VIP insertion to enable insertion of the IPv4 VIP address and port number in the HTTP requests sent to the servers.

CLI procedures

来configure a map IPv6 address by using the CLI:

At the command prompt, type:

set ns ip6 -map

Example:

> set ns ip6 2002::9 -map 200.200.200.200 Done 

来enable VIP insertion by using the CLI:

At the command prompt, type:

• set lb vserver -insertVserverIPPort
• sh lb vserver

Example:

> set lb vserver VS1_IPv6 -insertVserverIPPort ON Done 

GUI procedures

来configure a map IPv6 address by using the GUI:

1. Navigate toSystem>Network>IPs, on theIPV6stab, select the IP address for which you want to configure a map IP address, for example, 2002:0:0:0:0:0:0:9, and clickEdit.
2. In theMapped IPtext box, type the map IP address that you want to configure, for example, 200.200.200.200.

来enable VIP insertion by using the GUI:

1. Navigate toTraffic Management>Load Balancing>Virtual Servers, select the virtual server that you want to enable port insertion, and clickEdit.
2. In theAdvancedtab, underTraffic Settings, in theVserver IP Port Insertiondrop-down list box, selectVIPADDR.
3. In theVserver IP Port Insertiontext box, type the vip header.