Router Working Mode - Point-To-Point; Figure 16-2. Router Mode, Point-To-Point Diagram - Comtech EF Data CDM-570 Installation And Operation Manual

CDM-570/570L Satellite Modem with Optional IP Module
Typical IP Module Operation Setups
easyConnect mode will automatically use Header Compression (even if Header
Compression option has not been purchased). Because of this, some of the initial
traffic sent between two devices will not be received over the satellite until a full
IMPORTANT
Header is transmitted. For example, the default Header Compression Refresh Rate is
50 packets. If a ping is sent over the satellite, then it will time out until the full Header
packet is sent. The Header Compression Refresh Rate on the Administration Menu
can be reduced to minimize the amount of traffic lost when traffic is first sent between
two devices. Once communication between two devices has been established, both
CDM-IP modems will be able to receive all traffic, unless one CDM-IP is power cycled
or reset.
16.3.2 Router Working Mode – Point-to-Point
PC
IP 10.10.1.100/16
GW 10.10.1.1
IP Dest
10.20.0.0/16
This diagram shows a 256 kbps Point-to-Point duplex link in Router Mode. Note that
each side of the link has different IP subnets – 10.10.0.0/16 and 10.20.0.0/16. Each
CDM-IP modem has a static route defined for the distant CDM-IP modem subnet. The
Next Hop is automatically defined as Point-to-Point and there are no HDLC addresses to
configure. All that would be required to send traffic between the PCs on each subnet
would be to define the local CDM-IP modem as the PC default gateway. The CDM-IP
modems will only pass traffic over the satellite link by the ToSat routes configured in the
Route Table.
Satellite dish
RX
TX
Hub CDM-IP 1
(efi0) 10.10.1.1/16
Static Routes
Next Hop Type
Point-to-Point ToSat

Figure 16-2. Router Mode, Point-to-Point Diagram

Satellite
Satellite dish
TX
Remote CDM-IP 2
(efi0) 10.20.1.1/16
Static Routes
IP Dest Next Hop
10.10.0.0/16 Point-to-Point
16–5
Revision 3
MN/CDM570L.IOM
PC
IP 10.20.1.100/16
GW 10.20.1.1
RX
Type
ToSat