Comtech EF Data CDD-562AL - Manual (Page 153)

CDD-562AL/564A/L Multi-Channel Demodulator Revision 0
Telnet and CLI Operation MN-CDD562AL564AL
9–51
Dropped – Bad IP Header Checksum
• Total Dropped Packets due to incorrect IP Header Checksum.
Dropped – Bad Buffer Length
• IP length (as specified in packet header) was greater than payload received in the Ethernet packet.
This would indicate the packet was truncated before arriving).
Dropped – Bad IP Version
• Total Dropped IP Version 6 Packets (IP Module only supports IP Version 4).
Dropped – TTL Expired
• Total Dropped Packets due to Time To Live counter expired (TTL limits the number of hops, or
seconds, before a packet reaches it’s destination).
Dropped – No Route
• Total Dropped Packets due to no Route for the destination in the IP Module Route Table. These
are packets that are directed to the IP Module’s MAC address and the IP Module will reply to the
sender with a ICMP ‘Destination net unreachable’ message.
Dropped - No ARP Entry
• Total Dropped Packets due to no ARP entry in IP Module ARP Table. For example, if a IP
Module receives packets from the satellite for a host that is not in the ARP table, the IP Module
will send an ARP request. If there is no response, the packets will be dropped.
Dropped – Filtered Multicast
• Total Dropped Multicast Packets received from the satellite due to no SAT→LAN or
Dropped – Multicast Disable Group
• Multicast packet was dropped because, although route existed, IGMP is being used, and there is
no client requesting forwarding of this traffic or due to a IGMP “leave group” message.
Dropped – Router Queue Full
• Indicates that the router task is dropping packets due to being full. Represents a graceful drop
process when the processor performance is being overdriven.
Dropped – Total
• Total Dropped Packets
Reset All Counters, keystroke: C
• Type C to reset all WAN, Ethernet and IP Routing statistics to zero.