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QMultiFlex-400™ Installation and Operating Handbook
8.7 IP Functionality
8.7.1
Base Modem IP & IP processing card
As shown in Figure 8-27, the base modem has four RJ45 auto-sensing Gigabit ethernet ports
(in lower position). The first port (from left to right) is for M&C and the next one is for sending
and receiving satellite IP traffic. The other two are for cascading purposes (show in purple).
In the upper position is the additional IP processing card, which is required to be plugged
into the base modem traffic port via a patch cable (shown in orange). IP2 and IP3 are not
used. The main network traffic will be plugged into IP1 of this card (shown in blue).
M&C Port
As stated previously in this handbook, the M&C should not be bridged to the traffic. The default
is 'on' – which will need to be set to 'off' on the Edit->IP page. The M&C subnet needs to be
separate to any traffic VLAN subnets used. Essentially if any M&C subnet traffic makes it onto
the traffic port of the modem, system performance will become unpredictable.
To communicate with the modem for M&C purposes, an IP address and subnet mask must be
set. Note that setting an IP address to 0.0.0.0 causes the modem to request an IP address
from a Dynamic Host Control Protocol (DHCP) server on the network. Static routes are
supported allowing routing decisions to be made based on a set of explicit routing rules that
can be entered via the web user interface. The gateway setting in bridge mode would normally
be for the M&C server.
In routing mode, the use of a default gateway IP address provides a next-hop IP address for
all destinations that are not on the local subnet. This is usually the address of a router that has
been set up to forward packets to the correct network.
The bridge maintains information on how to forward frames based on replies that are received
from each device in the network.
8.7.2
IP Addressing
With the IP processing card, the base modem will need to be set to 'Trunking mode' which
is a high-speed link that bypasses the processor for higher throughputs with minimal jitter.
The IP processing card will operate in a bridge and is used to apply any other additional IP
features. Traffic IP addresses can be applied to the HUB and remote modems as long as
IP Traffic
Figure 8-27 Modem Ethernet Ports
8-36
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