
TABLE OF CONTENTS
MULTINET4 MULTI-PORT SERIAL SERVER & MANAGED SWITCH – INSTRUCTION MANUAL
TOC–5
D
ESIGN
C
ONSIDERATIONS
................................................................................................. 6-8
Configuring Bridge Settings ..................................................................................6 - 8
Configuring Port Settings .......................................................................................6 - 9
VLAN ...................................................................................................................................................... 6-10
A
DDING
VLAN
S
.................................................................................................................. 6-10
VLAN IDs ........................................................................................................................6 - 10
C
ONFIGURING
P
ORTS
FOR
VLAN M
EMBERSHIP
............................................................ 6-10
Port VLAN IDs ..............................................................................................................6 - 10
Tagging ..........................................................................................................................6 - 10
Filtering ...........................................................................................................................6 - 11
Frame Classification and Forwarding ..............................................................6 - 11
VLAN
S
AND
S
ERIAL
P
ORTS
............................................................................................... 6-12
SECURITY ............................................................................................................................................. 6-13
E
THERNET
P
ORT
S
ECURITY
................................................................................................ 6-13
Address Locking .........................................................................................................6 - 13
Link Locking ..................................................................................................................6 - 13
S
ERIAL
P
ORT
S
ECURITY
...................................................................................................... 6-13
Serial Data Over SSL ................................................................................................6 - 13
Multinet4 SSL Version Support ............................................................................6 - 14
Secure Web Server using HTTP over SSL (https://) .....................................6 - 14
K
EYS
AND
C
ERTIFICATES
.................................................................................................... 6-14
RSA Public Key Cryptography ..............................................................................6 - 15
Digital Signatures ......................................................................................................6 - 15
X.509 Certificates .......................................................................................................6 - 15
Certificate Authority .................................................................................................6 - 15
Multinet4 Certificate Files ......................................................................................6 - 15
Multinet4 Key Files ....................................................................................................6 - 16
Key Exchange ..............................................................................................................6 - 18
Peer Authentication ..................................................................................................6 - 18
Certificate and Key File Generation ..................................................................6 - 18
Certificate and Key File Installation ..................................................................6 - 21
RADIUS S
UPPORT
.............................................................................................................. 6-21
M
ULTINET
4 C
IPHER
S
UPPORT
........................................................................................... 6-21
SSH ......................................................................................................................................................... 6-23
MODBUS .............................................................................................................................................. 6-24
N
ETWORK
T
OPOLOGIES
...................................................................................................... 6-24
S
ERIAL
P
ROTOCOL
V
ARIANTS
............................................................................................ 6-24
N
ETWORK
P
ROTOCOL
......................................................................................................... 6-25
E
XCEPTION
H
ANDLING
....................................................................................................... 6-25
TCP C
ONNECTION
H
ANDLING
.......................................................................................... 6-26
USER ACCOUNT MANAGEMENT ................................................................................................ 6-27
U
SER
G
ROUPS
..................................................................................................................... 6-27
7: TERMINAL SERVER
APPLICATION NOTES
WHAT IS A TERMINAL SERVER? ................................................................................................. 7-1
S
ERIAL
P
ROTOCOL
S
TANDARDS
........................................................................................ 7-1
N
ETWORKING
S
TANDARDS
................................................................................................ 7-2
BRIDGING THE GAP BETWEEN SERIAL AND NETWORK COMMUNICATION .......... 7-3
TERMINAL SERVER OPERATION ................................................................................................. 7-4
P
ASSIVE
M
ODE
C
HANNELS
................................................................................................ 7-4
A
CTIVE
M
ODE
C
HANNELS
.................................................................................................. 7-4
M
IXED
M
ODE
....................................................................................................................... 7-5
S
ESSION
T
YPE
...................................................................................................................... 7-5
APPLICATION #1: DEVICE CONSOLE ACCESS ...................................................................... 7-6
APPLICATION #2: SERIAL-OVER-TCP/IP TUNNEL .............................................................. 7-8
APPLICATION #3: MULTIPOINT SCADA ................................................................................... 7-10