Port 2156 is registered to TRP — the Talari Reliable Protocol, the core tunneling mechanism of Talari Networks' SD-WAN product. If you saw UDP 2156 in your firewall logs, a Talari appliance was on one end of that connection.
What TRP Does
SD-WAN — software-defined wide area networking — solves a real problem: businesses have multiple WAN links (MPLS, broadband, LTE), and they want to use all of them intelligently without traffic falling into a black hole when one fails.
Talari's approach was to wrap all traffic between sites in UDP tunnels. Every packet crossing the WAN became a TRP packet on port 2156. From the outside, it all looked like UDP traffic to a single port. Inside, TRP was doing the real work: measuring each WAN path continuously, detecting packet loss and latency in near-real-time, and steering traffic away from degraded links before applications noticed anything wrong.
The name "Talari" comes from the winged sandals of Hermes — the messenger god. Appropriate for a protocol whose entire job was making sure messages arrived reliably regardless of which path they took.1
The Company Behind the Port
Talari Networks was founded in San Jose, California. It was early to SD-WAN when SD-WAN was still being explained to CIOs.
In November 2018, Oracle acquired Talari.2 The product became Oracle SD-WAN. The technology folded into Oracle's Communications portfolio alongside session border controllers and other enterprise networking infrastructure.
Talari was the third major SD-WAN vendor to be acquired in quick succession — Cisco took Viptela, VMware took VeloCloud, Oracle took Talari. The SD-WAN market was consolidating fast.
What Range This Port Belongs To
Port 2156 sits in the registered port range (1024–49151). These ports are assigned by IANA to specific services on request, but unlike well-known ports (0–1023), they don't require root privileges to bind. Any process can listen on a registered port.
Registered doesn't mean famous. Thousands of ports in this range belong to products most people have never heard of. TRP is one of them — known to network engineers who deployed Talari appliances, invisible to everyone else.
Who Still Uses This Port
Any organization running Oracle SD-WAN appliances (formerly Talari) still generates UDP 2156 traffic between their sites. Firewall rules at these companies specifically allow UDP 2156 between appliance endpoints.
If you're seeing port 2156 in traffic you don't recognize, and you have SD-WAN infrastructure, it's almost certainly Oracle SD-WAN tunnel traffic.
How to Check What's Listening on This Port
On Linux or macOS:
On Windows:
If nothing is listening locally, but you're seeing port 2156 in network captures, the traffic is transiting your network — not originating from your machine.
Frequently Asked Questions
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