Page 86 of 97
Title FireVu Detector Standalone Installation Manual
NetVu Ltd.
No 1 Thellow Heath Park, Northwich Road, Northwich, Cheshire. CW9 6JB
Log Email : Tick to include the sending of an email in system logs.
Multicast Web-page
In computer networking, multicast is group communication where data transmission is addressed
to a group of destination computers simultaneously. Multicast can be one-to-many distribution, or
many-to-many distribution.
Multicast should not be confused with physical layer point to multipoint communication.
If the “Separate IP for each camera” box is checked then each detector will be transmitted with a
different multicast address and the default port number.
TTL
–
The IP multicast routing protocol uses the Time-To-Live (TTL) field to decide how "far" from a
sending host a given multicast packet should be forwarded. The default TTL for multicast
datagrams is 1, which will result in multicast packets going only to other hosts on the local
network.
Multicast datagrams with initial TTL 0 are restricted to the same host.
Multicast datagrams with initial TTL 1 are restricted to the same subnet.
Multicast datagrams with initial TTL 32 are restricted to the same site.
Multicast datagrams with initial TTL 64 are restricted to the same region.
Multicast datagrams with initial TTL 128 are restricted to the same continent.
Multicast datagrams with initial TTL 255 are unrestricted in scope.
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