UT-3302 Encrypted Ethernet Tunnel

Tunnels All Ethernet Protocols Through Any IP Network

  • Ideal for LAN, voice, and video tunneling applications
  • UT Client software is available for PCs
  • Tunnels multicast + all other Ethernet protocols
  • UT-3302 temperature range of -20 to +70 C
  • Input voltage 10-18 VDC (12 Volt nominal), external 48 and 125 VDC power options
  • UT-3302 is a small, five ethernet port version with VLAN port functionality
  • Integral 4 port switch on the trusted interface
  • AC and DC power supply options
  • Multicast Unicast conversion/tunneling
  • Much simpler multicast tunnel than multicast GRE tunnel
  • Ethernet ports: 10/100BaseT, MDI/MDIX
  • One asynchronous serial port for setup, UDP or TCP Server functionality
  • Extensive security features for CIPS compliance
  • Can be set to either client mode or server mode
  • Server unit supports up to 8 remote client UTs
  • Extensive statistics logging and diagnostic tools
  • AES 128, 192 or 256 bit encryption
  • Can be used with or without encryption
  • Uses UDP as the transport protocol
  • Remote PC appears to be on the local network
  • Stand alone, rack mount, DIN clip mount
  • Bridges 802.1Q tagged V-LAN trunks or use VLAN tagging at the port level
  • Extensive filtering on MAC, IP, and Protocols
  • NAT friendly
UT-3302 Top View
UT-3302 Side View

The XT Family of encrypters released in 2017 offers increased throughput and is 100% compatible with all UT products. Check out the specs here!

Protocol Features
Application Notes and Manual
How To Order

Common Applications

  • VOIP dispatch terminals and consoles
  • Encrypted VOIP and encrypted ROIP
  • VOIP multicast applications
  • Encrypting video connections
  • Gas and oil production, pipelines
  • Alternative to GRE tunnel installations
  • Retail – Stores, credit card readers
  • Law Enforcement– Remote offices and multicast ROIP
  • Medical: Meets HIPAA encryption requirements for securely sending medical data
  • Secure remote sales and maintenance staff connections
  • NERC and CIPS compliant WAN connections
  • Support a remote office with one UT device
  • More security to sensitive locations within a corporate network
  • Securely bridge networks over the Internet for lower line costs
  • Remote network monitoring using the Internet for data transport


The UT-3302 is a compact, industrial temperature rated device (Internet Appliance) that tunnels all ethernet protocols (layer2 ethernet) through any UDP/IP connection. The tunnel can be encrypted with AES or non-encrypted. The UT-3302 features five Ethernet LAN ports, a 4 port switch on trusted interface and a serial setup port.

The UT-3302 encrypts data between private networks using the public Internet or any other network as the transport. This creates a flat, bridged network, a private network within public or private networks.

Each UT-3302 can be a client or server. All UT series products operate in server-client combinations (or using multiple clients and servers in a system). The UT-3302 can be a server unit for other UT-3302s, or PCs running UT-SOFT client software. The UT-3302 can also be a client device bridging it's local LAN to another UT-3302 or UT-6602 configured as a server. The UT-3302 supports up to 8 client UT locations, the UT-6602 supports 50 client UT units. Other models support 100 or more remote UT client locations.

The UT series uses AES 128, 192 or 256 bit encryption. AES is the US Government standard required for Critical Infrastructure Protection (CIPS) networks used in electrical power and utility communications. Additional features support the CIPS requirements such as password criteria, login banners, individual port enable/disable, and others.

Each of the four ethernet ports on the trusted side of the UT may be VLAN tagged (802.1q tagging) and interoperate with other VLAN equipment. Or, the UT connection can be configured as a VLAN trunk.

The UT-3302 network interfaces are Ethernet only. The UT-3302 has external 12, 24 and 48 volt options.

The UT series operates through firewalls with only one port of your choice opened. It bridges all Ethernet protocols including IPX, IP, NetBEUI, SIP, streaming, and other proprietary protocols. The UT series is straight-forward, easy to configure and maintain. The UT series has state-of-the-art AES encryption security without the configuration complexity of VPN.

The serial port of the UT-3302 functions as a TCP/IP or UDP/IP serial port "serial-server" or may be used for initial setup of IP address. The serial port may be used for initial IP address configuration. It interoperates with other DCB EtherPath or EtherPoll serial servers, and may be used to provide an AES encrypted serial link through any UDP/IP network.

For encryption of serial RS-232 links not involving ethernet or IP, see our SE-6600 product line.

The UT-3302 is also compatible with our newest XT encrypter series which offer increased throughput. See all XT options here.

Due to the encryption employed in these products, UT series products are export controlled items and are regulated by the Bureau of Industry and Security (BIS) of the U.S. Department of Commerce. The UT-6602 and UT-3302 are classified as mass market encryption devices and may not be exported or shipped for re-export to restricted countries in Country Group E:1. They are shippable to most other countries.



Protocol Features






How it works

The UT family products create an encrypted tunnel which passes Ethernet packets between two trusted LAN segments. All ethernet protocols are bridged between the UT units. The UT only operates in conjunction with other UT units. One unit is required for each location. Multiple client units may be connected to the same host unit, and a client may be connected to multiple host units (daisy-chained operation). A host unit may be configured to block client-unit to client-unit connections, or to allow them. All UT series units are compatible.

Download a copy of the manual.

The Facts, Please.

Read the encryptor FAQ for quick answers to questions others have asked. Just click here.

All DCB ethenet encryptors operate similarly, with differences being in the protocols, capabilities, and authentication methods. Since the topology is comparable for all of them, we show application notes for all these products together.

UT Product Security In Perspective
This document provides an overview of the UT security perspective as well as best practices for configuring UT encryptors.

Redundancy Techniques Using DCB Tunnel Devices and Software.
Users have come to rely on DCB tunnel products to implement secure networks for mission critical applications in which downtime must be kept to a minimum. Thus it is not unusual for customers to ask questions about techniques that may be applied to make the tunnel network more robust. This document describes some of those techniques with examples.

Quick-start guide to the XT-3306.
This application note guides the new XT-3306 user from opening the boxes to having a working encrypted tunnel between two XT-3306 units on a test bench. Step-by-step instructions make it quick and painless to learn the configuration process. One difference between the XT and the UT/ET families is that the XT allows the selection of TCP and UDP protocols for the tunnel path.

Troubleshooting guide for the above Quick-start.
If it didn't go well and doesn't immediately work, this guide offers some troubleshooting hints. Most people won't need this, but it's here if you do.

Encrypted Bridge Installation Option
An application note describing an appliance-like installation that allows the Tunnel to be located anywhere on the local LAN. Known around DCB as the "Single-Port Installation".

Using the UT Encrypted Bridges and UT-SOFT with IP Multicast.
Discusses applying the UT products to transport VOIP multicast via non-multicast wide area networks. Examples showing IP voice dispatch radios for public service agencies. The UT supports multi-cast IP over normal uni-cast networks and allows a private multi-cast network to span multiple IP networks. The UT-SOFT software client allows any PC to be a securely connected node on a remote network

Motorola MIP 5000 VoIP Radio Console VPN Solution Guide
This Motorola produced MIP 5000 VoIP Radio Console VPN Solution Guide features a virtual private network (VPN) solution that has been tested with MIP 5000 VoIP Radio Console. The VPN solution uses a pair of encrypted Ethernet bridges to provide a secure Ethernet tunnel between the dispatch center and a remote MIP 5000 console. The secure Ethernet tunnel supports a remote console operator receiving audio from and transmitting audio to radio channels and other MIP 5000 consoles using AES encryption.

UT Tunnel Installation Note - "Living On a Wild Feed... Safely"
This short application note summarizes the options and requirements for directly connecting the untrusted interface of UT encrypted tunnels to the Internet. Yes, the UT tunnels may be safely living on the wild side of your firewalls and if properly configured appear to be a "black hole" to your adversaries!

Using the UT for Remote Management Applications Since the UT along with UT-Soft enables a remote workstation to have a virtual presence on a remote LAN segment, it's quite useful for network monitoring and analysis, similar to a RMON without the headaches. Download an application note that discusses using UT-Soft and our UT servers for remote LAN network montoring.

The UT series operates similarly to our ET series encrypted tunnel. The main difference between the two product lines is that the UT uses UDP/IP protocol for the tunnel link while the ET uses TCP/IP for the tunnel link protocol. The following ET application notes apply to the UT as well as the ET series.

ET Encrypted Bridge Quick-Start Installation Guide
A cookbook style quick start guide to installing the ET Encrypted Bridges. Illustrates common usage examples with fill-in-the-blank instructions.

ET-3302/6600 Encrypted Bridge Applications
Some ways the ET products are being used to tunnel IP traffic in the real world.

ET Encrypted Bridge Installation Option
An application note describing an appliance-like installation that allows the ET to be located anywhere on the local LAN. Known around DCB as the "Single-Port Installation".

Using the ET Encrypted Bridges with 801.Q VLANs
Discusses configuring the ET products to handle 801.Q VLAN traffic. The ET supports 801.Q VLAN tagged packets, and allows a VLAN to span multiple IP networks.

Using the ET Encrypted Bridges with IP Multicast.
Discusses applying the ET products to transport VOIP multicast via non-multicast wide area networks. Examples showing IP voice dispatch radios for public service agencies. The ET supports multi-cast IP over normal uni-cast networks and allows a private multi-cast network to span multiple IP networks.

Automating Dial-Up Router and Bridge PPP Connections
An application note that details one common method of automating the use of DCB routers and bridges to dial multiple remote locations on a scheduled or automated basis.

Applications Drawing

Questions? Phone us toll free at 800-432-2638

Due to the nature of this product,
we prefer that you phone us and discuss your application prior to ordering this product.

Item Number Description Price Buy Now!
UT-3302 Encrypted UT ethernet Tunnel Appliance, includes external 120 VAC power supply $ 389 Qty:
9501090 18-35 VDC external power supply option $ 75 Qty:
9501091 36-72 VDC external power supply option $ 75 Qty:
9501081 125 VDC external power supply option $ 125 Qty:
6013006 Optional DIN rail mounting clips $ 14 Qty:

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