Westermo RedFox Series User Manual
Page 589
Westermo OS Management Guide
Version 4.17.0-0
IP multicast routing enables efficient distribution of multicast data in a routed
network. A source, such as an IP camera, will send its data to a specific multi-
cast IP address (also referred to as a multicast group), and receivers (the group
members) will listen in to this address by joining the group. WeOS supports static
multicast routing, which enables the network manager to manually set the multi-
cast routing entries in the routers. Dynamic multicast routing protocols, such as
DVMRP or PIM-SM, are not yet supported. See
for more details on IP
multicast routing.
While dynamic routing protocols such as RIP and OSPF enable routers to find
redundant paths in case a link or router goes down, they do not enable end
devices (hosts) to use a second router if their regular router goes down.
To
support redundancy between hosts and routers the Virtual Router Redundancy
Protocol (VRRP) is used. With VRRP, a backup router will take over if a router
fails, and communication from connected hosts can continue automatically. VRRP
support is covered in
When a router is used as a company gateway to a public network, such as the
Internet, there is an obvious need to protect the local company network against
network intrusion and other attacks. It is also common that the hosts and routers
within the company network use private IP addresses. To protect the company
network and to enable the use of private IP addresses, WeOS includes firewall
and network address translation (NAT) support.
describes the NAT
and firewall features in WeOS.
Another need which occurs when connecting company networks to the Internet is
to ensure communication privacy. WeOS supports IPsec VPN and SSL VPN (Open-
VPN) to establish secure communication over public networks. With VPNs, a com-
pany can secure communication between a head office and different branch of-
fices by installing a WeOS device as VPN gateway at each site. WeOS VPN support
is covered in
26.1.2
Using a WeOS device as a switch or as a router
WeOS devices are both able to route and to switch packets, i.e., they are routing
switches. Switching is performed between ports in the same VLAN, while routing
is performed between IP subnets or network interfaces (please see
in
for information on the distinction between ports, VLANs and network
dynamic multicast routing.
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