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IP Setup
The IP Port Setup dialog box enables you to change the IP routing capabilities that were set up
during software installation. This dialog box has five tabs: Ethernet, WAN 1, WAN 2, WAN 3, and
Advanced.
The Ethernet tab enables you to configure various parameters relating to the Ethernet port. For
example, you can change the Ethernet port IP Address and IP mask; If necessary, you can change
the Ethernet Frame Type from Type II to SNAP; you can enable or disable various types of support,
set up RIPv2 parameters, and enable the type of Authentication (if any).
The Frame Type option defines the MAC layer frame encapsulation to be used for IP transmissions
from the specified port. The Ethernet port supports Type II and SNAP frames, but the WAN ports
support only Type II frames.
In the Support group, ICMP Redirect defines if the specified port is permitted to issue an ICMP
Redirect message to the source IP address. The most likely cause of this message is the delivery of
a datagram to a router that is not on the forwarding path to the destination address. This is often due
to a wrong configuration of the IP client sending the datagram. The packet causing the ICMP Redirect
message to be transmitted is forwarded to the appropriate router.
ICMP Mask Reply enables support for nodes on the connected networks to learn their subnet
masks.
RIP (Routing Information Protocol) enables RIP-based routing on the specified port, and is normally
enabled. However, RIP can be disabled if you are using WAN links in Dial-on-Demand mode. In such
links, disabling RIP will reduce traffic on the link as this will also disable periodic RIP broadcasts. RIP
routing on the port will be automatically turned off when Dial-on-Demand is enabled in PPP port
setup.
Finally, the RIP Poisoned Reverse option defines if Poisoned Reverse RIP messages are supported
on the specified port. Generation and processing of poisoned routes (RIP entries with their
respective metric set to 16 (defined as infinity) is enabled/disabled by this parameter. Poisoned
reverse is a method used by RIP to improve the rate of convergence of the routing tables of
interconnected IP routers. Routers supporting poisoned reverse that receive such RIPs ignore the
entries set to 16 and thus prevent the propagation of unnecessary (and often incorrect when a
topology change occurs) information which in turn speeds up the rate at which RIP will correctly map
the current network topology.
MTASR3-200
Chapter 4 - RASFinder Software
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