Manual Chapter : Creating virtual servers to process DNS queries
Applies To:Show Versions
- 14.0.1, 14.0.0
- 14.0.1, 14.0.0
Creating virtual servers to process DNS queries
Create virtual servers to process the DNS queries that DNS Express handles. When DNS Express is only answering DNS queries, only two virtual servers are required: one with an IPv4 address that handles UDP traffic and one with an IPv6 address that handles UDP traffic.
However, the best practice is to create four listeners, which allows DNS Express to handle zone transfers, should you decide to use this feature. DNS zone transfers use TCP port
53. With this configuration, you create one virtual server with an IPv4 address that handles UDP traffic, and one with the same IPv4 address that handles TCP traffic. You also create one virtual server with an IPv6 address that handles UDP traffic, and one with the same IPv6 address that handles TCP traffic.
These steps apply only to LTM-provisioned systems.
- On the Main tab, click.The Virtual Server List screen opens.
- Click theCreatebutton.The New Virtual Server screen opens.
- In theNamefield, type a unique name for the virtual server.
- In theDestination Address/Maskfield, type the IP address in CIDR format.The supported format is address/prefix, where the prefix length is in bits. For example, an IPv4 address/prefix is10.0.0.1or10.0.0.0/24, and an IPv6 address/prefix isffe1::0020/64or2001:ed8:77b5:2:10:10:100:42/64. When you use an IPv4 address without specifying a prefix, the BIG-IP system automatically uses a/32prefix.The IP address for this field needs to be on the same subnet as the external self-IP.
- In theService Portfield, type53.
- From theProtocollist, selectUDP.
- Optional: If you are using SNATs on your network, from theSource Address Translationlist, selectSNAT.
- Optional: From theSNAT poollist, select the name of an existing SNAT pool.
- From theConfigurationlist, selectAdvanced.
- From theDNS Profilelist, select eitherdnsor the custom DNS profile you created for DNS Express.
Create another virtual server with the same IPv4 address and configuration, but select
Protocollist. Then, create two more virtual servers, configuring both with the same IPv6 address, but one with the UDP protocol and one with the TCP protocol.