Enable persistent NAT for DIPP when applications behind the firewall that use NAT and
require STUN.
Many real-time communication applications, like VoIP and video conferencing, rely on
Session Traversal Utilities for NAT (STUN) to establish and maintain stable
connections. However, when these applications are deployed with Dynamic IP and Port
(DIPP) source NAT, they can experience connectivity issues. This happens because
DIPP uses a symmetric NAT approach, which can change the translated IP address and
port for each new session. This frequent change can cause compatibility problems
with STUN, often resulting in dropped calls or one-way audio for users.
Persistent NAT for DIPP solves this
problem by ensuring a consistent and predictable translation for a given internal
source IP and port. When you enable this feature, the mapping between a private
source IP address and port and its public translated address and port persists for
subsequent sessions. This stable binding is crucial for maintaining seamless,
uninterrupted communication, providing the reliable connectivity that real-time
applications demand.