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6.5.8 Multicast transmission
Multicast is the message transmission from a single point to a group (also known as a multiple-point
connection). The advantage of multicast is that messages can be transmitted simultaneously to several
recipients or a closed user group without the bandwidth of the sender increasing according to the number
of recipients. When using multicast, the sender only requires the same bandwidth as a single recipient.
The packets are multiplied on each network distributor (switch, router).
Multicast allows data to be sent efficiently to many recipients at the same time in IP networks. This is made
with a special multicast address. In IPv4, the address range 224.0.0.0 to 239.255.255.255 is reserved for
this purpose.
The following multicast settings can be configured for streams 1 - 4 in the network camera.
Enable
“Always multicast”
to use multicast.
“Multicast group address”
Specifies a group of IP hosts which belong to this group
“Multicast video port”
This port can be different from the default port 5560. The port number must always
be even.
“Multicast RTCP video port”
This port must be the “Multicast video port” plus 1.
“Multicast audio port”
This port can be different from the default port 5562. The port number must always
be even.
“Multicast RTCP audio port”
This port must be the “Multicast audio port” plus 1.
“Multicast TTL”
Time to Live
If you are setting up port forwarding in a router, all ports should always be forwarded this way
(RTSP + HTTP). This is imperative for successful communication.
7. DDNS
DynDNS or DDNS (Dynamic Domain Name System) is a system used for updating domain name entries in
real time. The network camera is equipped with an integrated DynDNS client, which updates the IP address
independently via a DynDNS provider. If the network camera is positioned behind a router, we recommend
using the DynDNS function on the router.
The following diagram offers an overview of accessing and updating the IP address using DynDNS.
DynDNS.org
Name Server
c
192.168.0.3
f
195.184.21.78
Æ
name.dyndns.org
d
195.184.21.78
LAN
WAN
Internet
f
e
DynDNS
access data
