150
D14049.03
MAY 2008
Grey Headline
(continued)
TANDBERG
VIDEO COMMUNICATIONS SERVER
ADMINISTRATOR GUIDE
Firewall Traversal and Authentication
Overview
Client
Server
VCS Control or VCS Expressway
The VCS client provides its
•
Authentication Username
and
Authentication Password
. These are set on the VCS client via
VCS
Configuration > Authentication > Configuration
,
in the
External
Registration Credentials
section.
VCS Expressway
The traversal server zone for the VCS client must be configured with the
•
Client Authentication Username
. This is set on the VCS Expressway via
VCS Configuration > Zones > Edit Zone
, in the
Configuration
section.
There must also be an entry in the VCS Expressway’s authentication
•
database with the corresponding client username and password.
Endpoint
The endpoint client provides its
•
Authentication ID
and
Authentication
Password
.
VCS Expressway
There must be an entry in the VCS Expressway’s authentication
•
database with the corresponding client username and password.
TANDBERG Gatekeeper (version 5.2 and earlier)
The Gatekeeper looks up its
•
System Name
in its own authentication
database and retrieves the password for that name. It then provides
this name and password.
VCS Expressway
The traversal server zone for the Gatekeeper client must be configured
•
with the Gatekeeper’s
System Name
in the
Client Authentication
Username
field. This is set on the VCS Expressway via
VCS
Configuration > Zones > Edit Zone
, in the
Configuration
section.
There must be an entry in the VCS Expressway’s authentication
•
database that has the Gatekeeper’s System name as the username,
along with the corresponding password.
TANDBERG Gatekeeper (version 6.0 and later)
The Gatekeeper provides its
•
Authentication Username
and
Authentication Password
. These are set on the Gatekeeper via
Gatekeeper Configuration > Authentication
, in the
External Registration
Credentials
section.
VCS Expressway
The traversal server zone for the Gatekeeper client must be configured
•
with the Gatekeeper’s
Authentication Username
. This is set on the
VCS Expressway via
VCS Configuration > Zones > Edit Zone
, in the
Configuration
section
There must also be an entry in the VCS Expressway’s authentication
•
database with the corresponding client username and password.
VCS Control or VCS Expressway
If Authentication is On on the Border Controller, the VCS client provides
•
its
Authentication Username
and
Authentication Password
. These
are set on the VCS client via
VCS Configuration > Authentication >
Configuration
, in the
External Registration Credentials
section.
If the Border Controller is in Assent mode, the VCS client provides
•
its
Authentication Username
. This is set on the VCS client via
VCS
Configuration > Authentication > Configuration
, in the
External
Registration Credentials
section.
Border Controller
If Authentication is On on the Border Controller, there must be an entry
•
in the Border Controller’s authentication database that matches the
VCS client’s
Authentication Username
and
Authentication Password
.
If the Border Controller is in Assent mode, the traversal zone
•
configured on the Border Controller to represent the VCS client must
use the VCS’s
Authentication Username
in the Assent
Account name
field. This is set on the Border Controller via
TraversalZone > Assent >
Account name
.
In order to control which systems can use the
VCS Expressway as a traversal server, each
VCS Control or Gatekeeper that wishes to be
its client must first authenticate with it.
Upon receiving the initial connection
request from the traversal client, the VCS
Expressway asks the client to authenticate
itself by providing a username and password.
The VCS Expressway then looks up the
client’s username and password in its own
authentication database. If a match is found,
the VCS Expressway will accept the request
from the client.
The settings used for authentication depend
on the combination of client and server being
used. These are detailed in the table opposite.
All VCS and Gatekeeper traversal
clients must authenticate with the VCS
Expressway, regardless of the VCS
Expressway’s Authentication Mode setting.
However, endpoint clients are only required to
authenticate if the VCS Expressway’s
Authentication Mode is On.
All VCS and Gatekeeper traversal clients
must authenticate with the VCS Expressway.
The authentication process makes use of
timestamps and requires that each system
is using an accurate system time. The
system time on a VCS is provided by a remote
NTP server. Therefore, in order for firewall
traversal to work, all systems involved must be
configured with details of an NTP serve
.
Authentication and NTP
