Manual Chapter :
Creating virtual servers to process DNS queries
Applies To:
Show Versions
BIG-IP LTM
- 14.0.1, 14.0.0
BIG-IP DNS
- 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.
- ClickFinished.
Create another virtual server with the same IPv4 address and configuration, but select
TCP
from the Protocol
list. 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.
