ltm rule command UDP hold
iRule(1) BIG-IP TMSH Manual iRule(1)
UDP::hold
Hold client ingress until UDP::release is called.
SYNOPSIS
UDP::hold
DESCRIPTION
Hold back processing of input packets until UDP::release is called.
Syntax
UDP::hold
In certain use cases, it is desirable to delay processing of UDP input packets until after certain routing,
address translation, or load balancing determinations have occured. For example, certain media control
protocols embed IP addresses in the payload, which need to be translated from public IP to private IP inbound
through a firewall, and vice versa on the way out.
Since this command could introduce some delay, it is advisable to enable some amount of packet buffering in
the UDP profile. See the Max Buffer Packets and Max Buffer Bytes settings.
This command holds data back, so it is not compatible with other filters and event handlers that require data
to make load balancing decisions, and could find themselves blocked waiting on data that is being held.
RETURN VALUE
VALID DURING
CLIENT_ACCEPTED
EXAMPLES
when CLIENT_ACCEPTED {
UDP::hold
}
when SERVER_CONNECTED {
UDP::release
}
HINTS
SEE ALSO
UDP::release
CHANGE LOG
@BIGIP-14.1.0 --First introduced the command.
BIG-IP 2020-06-23 iRule(1)