38
Chapter 1 Overview
320818-A
Communication channels
Communications between the Nortel SNAS 4050 and key elements of the Nortel
SNA solution are secure and encrypted.
Table 1
shows the communication
channels in the network.
Telnet or SSH can be used for management communications between remote PCs
and the Nortel SNAS 4050 devices.
About SSH
The Secure Shell (SSH) protocol provides secure and encrypted communication
between the Nortel SNAS 4050 and the network access devices, and between
Nortel SNAS 4050 devices and remote management PCs not using Telnet.
SSH uses either password authentication or public key authentication. With public
key authentication, pairs of public/private SSH host keys protect against “man in
the middle” attacks by providing a mechanism for the SSH client to authenticate
the server. SSH clients keep track of the public keys to be used to authenticate
different SSH server hosts.
SSH clients in the Nortel SNA network do not silently accept new keys from
previously unknown server hosts. Instead, they refuse the connection if the key
does not match their known hosts.
Table 1
Communication channels in the Nortel SNA network
Communication
Communication protocol
Between Nortel SNAS 4050 and edge
switches
SSH
Between Nortel SNAS 4050 devices in a
cluster
TCP and UDP
Between Nortel SNAS 4050 and client PC
(TunnelGuard applet)
SSL/TLS
Between Nortel SNAS 4050 and SREM
SSH
From edge switch to EPM
SNMPv3 Inform
From EPM to edge switch
Telnet over SSH
From authorized endpoint to DHCP server
UDP
Summary of Contents for 4050
Page 24: ...24 Contents 320818 A ...
Page 48: ...48 Chapter 1 Overview 320818 A ...
Page 70: ...70 Chapter 2 Initial setup 320818 A ...
Page 190: ...190 Chapter 4 Configuring the domain 320818 A ...
Page 232: ...232 Chapter 5 Configuring groups and profiles 320818 A ...
Page 352: ...352 Chapter 7 TunnelGuard SRS Builder 320818 A ...
Page 456: ...456 Chapter 9 Customizing the portal and user logon 320818 A ...
Page 568: ...568 Chapter 10 Configuring system settings 320818 A ...
Page 722: ...722 Chapter 13 Viewing system information and performance statistics 320818 A ...
Page 756: ...756 Chapter 14 Maintaining and managing the system 320818 A ...
Page 768: ...768 Chapter 15 Upgrading or reinstalling the software 320818 A ...
Page 802: ...802 Chapter 17 Configuration example 320818 A ...
Page 880: ...880 Appendix C Supported MIBs 320818 A ...
Page 900: ...900 Appendix F Configuring DHCP to auto configure IP Phones 320818 A ...