Overriding The Multicast Settings On An Interface; Multicast Destination Nat - Fortinet FortiGate Series Administration Manual

Multicast

Overriding the multicast settings on an interface

Multicast destination NAT

374
You use multicast (PIM) interface options to set operating parameters for FortiGate
interfaces connected to PIM domains. For example, you can enable dense mode on an
interface that is connected to a PIM-enabled network segment. When sparse mode is
enabled, you can adjust the priority number that is used to advertise Rendezvous Point
(RP) and/or Designated Router (DR) candidacy on the interface.
Figure 197: Multicast interface settings
Interface Select the name of the root VDOM FortiGate interface to which these
settings apply. The interface must be connected to a PIM version 2 enabled
network segment.
PIM Mode Select the mode of operation: Sparse Mode or Dense Mode. All PIM routers
connected to the same network segment must be running the same mode
of operation. If you select Sparse Mode, adjust the remaining options as
described below.
DR Priority Enter the priority number for advertising DR candidacy on the FortiGate
unit's interface. The range is from 1 to 4 294 967 295.
The unit compares this value to the DR interfaces of all other PIM routers on
the same network segment, and selects the router having the highest DR
priority to be the DR.
RP Candidate Enable RP candidacy on the interface.
RP Candidate Priority Enter the priority number for advertising RP candidacy on the FortiGate
interface. The range is from 1 to 255.
Multicast destination NAT (DNAT) allows you translate externally received multicast
destination addresses to addresses that conform to an organization's internal addressing
policy.
By using this feature that is available only in the CLI, you can avoid redistributing routes at
the translation boundary into their network infrastructure for Reverse Path Forwarding
(RPF) to work properly. They can also receive identical feeds from two ingress points in
the network and route them independently.
Configure multicast DNAT in the CLI by using the following command:
config firewall multicast-policy
edit p1
set dnat <dnatted-multicast-group>
set ...
next
end
For more information, see the "firewall" chapter of the FortiGate CLI Reference.
FortiGate Version 4.0 MR1 Administration Guide
01-410-89802-20090903
http://docs.fortinet.com/
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