DNS Support for the Responder Feature
您可以配置响应方特性来回应to DNS requests as it does to HTTP and TCP requests. For example, you could configure it to send DNS responses over UDP and ensure that the DNS requests from the client are sent over TCP. A number of Citrix ADC expressions support examination of the DNS header in the request. These expressions examine specific header fields and send an appropriate response.
DNS Expressions. In a responder configuration, you can use the following Citrix ADC expressions to refer to various portions of a DNS request:
| Expressions |
Descriptions |
| DNS.NEW_RESPONSE |
Creates a new empty DNS response based on the request. |
| DNS.NEW_RESPONSE |
Creates a new DNS response based on the specified parameters. |
DNS Bind Points. The following global bind points are available for policies that contain DNS expressions.
| Bind Points |
Descriptions |
| DNS_REQ_OVERRIDE |
Priority/override request policy queue. |
| DNS_REQ_DEFAULT |
Standard request policy queue. |
In addition to the default bind points, you can create policy labels of type DNS and bind DNS policies to them.
Configuring Responder Policies for DNS
The following procedure uses the Citrix ADC command line to configure a responder action and policy and bind the policy to a responder-specific global bind point.
To configure Responder to respond to a DNS request:
At the command prompt, type the following commands:
add responder action
For , substitute a name for your new action. The name can be 1 to 127 characters in length, and can contain letters, numbers, hyphen (-), and underscore (_) symbols. For , substitute a responder action type,respondWith.
add responder policy
For , substitute a name for your new policy. For , the name can be 1 to 127 characters in length, and can contain letters, numbers, hyphen (-), and underscore (_) symbols. For , substitute the name of the action that you just created.
bind responder policy -type
For , specify one of the responder-specific global bind points. For , substitute the name of the policy that you just created. For , specify the priority of the policy.
Sample configuration - Enforce all DNS request over TCP:
To enforce all the DNS requests over TCP, create a responder action that will set the TC bit and rcode as NOERROR.
>添加响应器动作resp_act_set_tc_bit回应with DNS.NEW_RESPONSE(true, true, NOERROR) Done > add responder policy enforce_tcp dns.REQ.TRANSPORT.EQ(udp) resp_act_set_tc_bit Done >bind lb vserver dns_udp –policyName enforce_tcp -type request –priority 100 Done
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