Working with Clusters and Match Rules
UDP Cluster Limitations
Layer 4 UDP clusters are appropriate for connectionless (stateless) applications, such as DNS,
TFTP, Voice over IP (VoIP), and streaming applications. UDP applications typically exchange short
packets with many clients, and typically provide faster network performance over TCP
applications, because UDP applications do not re-transmit dropped packets and do not performing
error checking.
Compared to Layer 7 clusters, UDP clusters share the same general limitations of Layer 4 TCP
clusters, the most important being:
1. SSL offload is not supported for UDP clusters. If you would like to use a secure UDP applic-
ation, you must install certificates directly on your physical servers rather than in the UDP
cluster.
2. IP-address based persistence is the only persistence type supported.
3. Match Rules are not supported.
There are also several limitations that apply only to UDP clusters and servers:
1. A UDP server can be used in exactly one UDP cluster. This means that all server pools
attached to all UDP clusters must contain UDP servers that each have a unique IP address.
2. UDP clusters can use only IPv4 addresses; all servers used by a UDP cluster must have IPv4
addresses.
3. You can't use ACV probes with UDP servers.
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