Lantronix EDS32PR User Manual

C: Networking and Security
EDS Device Servers User Guide 161
Tunneling
Tunneling provides a way to create a connection between two serial devices across an
untrusted network so the devices can share data. The sharing of information is achieved
through a direct connection (or “serial tunnel”) between the two devices that
encapsulates, authenticates, and encrypts the serial data into TCP packets and sends
them across the Ethernet network. In this way, two previously isolated and non-
networked devices can securely and effectively communicate and exchange information
and operate with existing installed software applications or devices that are configured to
run independent of an Ethernet network. And because the tunnel can be secure, anyone
who tries to monitor the conversation between the two devices would see encrypted,
unintelligible data.
The figure below shows how a pair of device servers can be used in tandem to provide
transparent serial tunneling across an Ethernet network. In this example, a POS device in
a store collects data and sends it to a device server attached to a POS serial port. The
device server forwards the collected data, through an encrypted tunnel established over
the Ethernet network, to a device server connected to a remote PC. The data received at
the remote device server is decrypted and forwarded to the PC’s serial port and received
at the remote PC. In this way, serial data that goes in one end comes out at the other
end.
Example of an Encrypted Tunnel

Lantronix EDS32PR Specifications

General

Certification	UL/CUL, FCC, CE, TUV, C-Tick, GS, CB scheme, VCCI FCC Part 15 Statement Class A Device, ICES-003 Class A Device, C-Tick, VCCI, CE Marking, UL-CUL Mark, TUV-GS Mark, RoHS FCC CFR 47 Part 15 Subpart B, ICES-003 Issue 4, AS/NZS CISPR 22, VCCI V-3, EN55022, EN61000-3-2, EN61000-3-3, EN55024, EN61000-4-2, EN61000-4-3, EN61000-4-4, EN61000-4-5, EN61000-4-6, EN61000-4-8, EN61000-4-11
Networking standards	IEEE 802.3
Serial interface type	RS-232
Serial ports quantity	32
Ethernet LAN data rates	10, 100 Mbit/s
Cabling technology	10/100Base-T(X)
USB 2.0 ports quantity	0
Ethernet LAN (RJ-45) ports	1
Security algorithms	SSH
Supported network protocols	HTTP, HTTPS, FTP, TFTP, Telnet, TCP, UDP, LPD, XML, DHCP, SSHv2, SSLv3, SNMPv2, AutoIP, RSS, ARP, ICMP, SYSLOG, AES, SMTP, DNS, BOOTP, Traceroute
Built-in processor	Intel XScale IXP420
Processor frequency	266 MHz
Compatible operating systems	Windows 98/ME/NT/2000/XP/Vista
Flash memory	8 MB
RAM capacity	64 MB
LED indicators	LAN
Storage temperature (T-T)	-40 - 70 °C
Operating temperature (T-T)	0 - 50 °C
Operating relative humidity (H-H)	5 - 95 %
Input voltage	100 - 240 V
Safety	UL 60950-1, CSA-22.2 No.60950-1-03, EN60950-1, CB Report - IEC 60950-1