43
D14049.07
March 2010
Grey Headline
(continued)
TANDBERG
VIDEO COMMUNICATION SERVER
ADMINISTRATOR GUIDE
Introduction
Overview and
status
System
configuration
VCS
configuration
Zones and
neighbors
Clustering and
peers
Call
processing
Bandwidth
control
Firewall
traversal
Appendices
Applications
Maintenance
System configuration
The
DNS
page lets you configure the VCS's DNS servers and DNS
settings.
To go to the
DNS
page:
•
System configuration > DNS
To configure DNS settings using the CLI:
•
xConfiguration IP DNS
About DNS servers
You must specify at least one DNS server to be queried for
address resolution if you want to either:
•
use FQDNs (Fully Qualified Domain Names) instead of IP
addresses when specifying external addresses (for example for
LDAP and NTP servers, neighbor zones and peers)
•
use features such as
URI dialing
or
ENUM dialing
You can specify up to 5 DNS servers. The VCS sends requests
to all configured servers in parallel taking the first result received
and discounting the rest.
!
This can lead to confusing behavior should local network
administrators, for example, deploy "split horizon" DNS
where records held on an internal, corporate, DNS server
use the same domain names but with different values to those on
the public internet - an often used tactic in corporate intranets.
About DNS settings
Local host name
The
Local host name
defines the DNS host name that this VCS is
known by.
•
It must be unique for each peer in a cluster.
•
It is used to identify the VCS on a remote log server (a default
name of "TANDBERG" is used if the
Local host name
is not
specified).
Domain name
The
Domain name
is used when attempting to resolve unqualified
server addresses (for example "ldap" or "ldap_server"). It is
appended to the unqualified server address before the query is
sent to the DNS server. If the server address is fully qualified
(for example "ldap.server") or is in the form of an IP address,
the domain name is not appended to the server address before
querying the DNS server.
It applies only to the following configuration settings in the VCS:
•
LDAP server
•
NTP server
•
External Manager server
•
Remote logging server
TANDBERG recommends that all server addresses use an IP
address or FQDN (Fully Qualified Domain Name).
The DNS
Domain name
plays no part in URI dialing.
Note that the FQDN of the VCS is the
Local host name
plus the
Domain name
.
DNS
Quality of Service (QoS)
The
Quality of Service
(QoS) page lets you configure QoS options
for outbound traffic from the VCS.
This allows the network administrator to tag all signaling and
media packets flowing through the VCS with one specific QoS
tag and hence provide the ability to prioritize video traffic over
normal data traffic. Management traffic, for example SNMP
messages, is not tagged.
To go to the
Quality of Service
page:
•
System configuration > Quality of Service
To configure QoS settings using the CLI:
•
xConfiguration IP QoS
Supported mechanisms
The VCS supports the
DiffServ
(Differentiated Services)
mechanism which puts the specified
Tag value
in the TOS (Type
Of Service) field of the IPv4 header or TC (Traffic Class) field of
the IPv6 header.
You must save your changes and restart the system for
changes to take effect.
