Comtech EF Data CDM-570 - Manual (Page 279)

CDM-570/570L Satellite Modem with Optional IP Module Revision 12
Ethernet IP Module - CLI and Telnet Operation MN/CDM570L.IOM
14–9
Selection Entry Description
IGMP I Toggle [Enabled] or [Disabled].
This page configures the IP Module to report an interest to join a Multicast
group on an IGMP server. Use the IGMP protocol to regulate Multicast traffic
on a LAN segment to prevent information of no interest from consuming
bandwidth on the LAN.
The receive portion of an IP Module will utilize the IP Module as an IGMP
server. The transmit portion of an IP Module will utilize the IP Module as an
IGMP client.
Downlink Route All
Available Multicast
M Toggle [Enabled] or [Disabled].
Enabled tells the IP Module to route all Multicast packets coming from the
Satellite interface to the Ethernet LAN regardless of the Route Table entries.
Disabled tells the IP Module not to automatically forward all Multicast
packets. This IP Module will only forward multicast traffic received from the
satellite to the Ethernet port if the multicast route exists in the Route Table.
Quality of Service (QoS) Q This feature must be purchased.
Toggle [Enabled] or [Disabled].
Enabled tells the IP Module to apply configured QoS rules on all packets
going out the Satellite Interface.
When Disabled, the IP Module does not apply QoS rules for outgoing
packets.
Transmit 3xDES
Encryption T This feature must be purchased.
Toggle [Enabled] or [Disabled].
Enabled allows the IP Module to assign a TX key to encrypt packets for a
specific route being sent over the Satellite Interface.
When Disabled, the IP Module cannot encrypt packets being sent over the
Satellite interface.
Receive 3XDES
Decryption [RO] This feature must be purchased.
Available allows the IP Module to decrypt packets being received from the
Satellite Interface.
When Unavailable the IP Module cannot decrypt packets received from the
Satellite Interface. This option is auto-sensed by a bit carried in packet
headers. This option is always available if the option is purchased.
L3/L4/L5 Tx Header
Compression H This option compresses L3/L4/L5 headers. Headers available for compression
can be referenced in the IP Header Compression section. Note that, in
Managed Switch mode, all L2 Ethernet Headers are compressed whether or
not this feature is enabled. In Router mode, this screen shows compression
as Available, and the option must be enabled per route in Route table.
L3/L4/L5 Rx Header
Compression K This option tells the system to expect received streams to be Header
compressed.
Important Note for HDLC Encapsulation users (IP Module V1 Firmware
Ver. 1.6.# and earlier / IP Module V2 Firmware Ver. 2.1.# and earlier): A
modem must receive all streams Header compressed or not Header
compressed. The modem has no way to distinguish between compressed or
not compressed. If a modem has TX Header Compression enabled, the
receiving modem will not be able to receive any data unless RX Header
Compression is also Enabled. For this reason, when enabling Header
Compression on a live satellite link, you must always first enable the option on
the remote modem.