User's Manual
Table Of Contents
- Chapter 1 Introduction
- Features and Benefits
- Transparent Ethernet Bridging with Advanced Filtering for Security and Network Reliability
- IP Routing with Advanced Filtering for Security
- SNMP Management
- SNMP Features
- SNMP Management
- IP-Router Features
- Encryption Features (Add-on Option)
- Wireless Multipoint Protocol
- Additional Functionality for SPEEDLAN 4100 & 4200
- Features
- Chapter 2 Quick Start
- System Description
- Package Contents
- Installation Steps
- Installation Diagram
- Polarizations on a Grid Antenna
- Chapter 3 Hardware
- Upgrading the Firmware
- Chapter 4 Overview of Configurator
- Installation and Setup
- Toolbar and Menus
- Chapter 5 Configuring SPEEDLAN 4100 & 4200
- General Setup
- Interface & Advanced Interface Setup
- The Setup Buttons
- Chapter 6 Bridging Setup
- Bridge Setup
- Chapter 7 Setting Up the IP Addresses (IP Host Setup)
- Part I - Quick Overview of IP Addressing
- Part II - Setting Up the IP Address
- Chapter 8 IP-Router Setup
- IP Routing Setup
- Chapter 9 SNMP Setup
- SNMP Setup
- Chapter 10 System Access Setup
- System Access Setup
- Chapter 11 SNMP Monitoring
- Remote Statistics
- Interface Monitor
- Ethernet-like Interface Monitor
- Campus PRC Station Entries
- 11Mb RF Interface
- SNMP Monitor
- IP Monitor
- IP/TCP/UDP Monitor
- ICMP Monitor
- Chapter 12 Tables
- System Information
- Bridge Learn Table
- IP ARP Table
- IP Route Table
- IP/TCP Connection Table
- IP/UDP Listener Table
- Local IP-Address Table
- Chapter 13 Analyzing Wireless Equipment
- Select Another Device
- Analysis Polling Interval
- Wireless Link Test
- Antenna Alignment
- Glossary for Standard Data Communications
- Glossary for Standard Data Communications
- Appendix Protocols & Ethernet Addresses
- Common Ethernet Protocols
- Common Ethernet Vendor Addresses
- Common Ethernet Multicast Addresses
- Common Ethernet Broadcast Addresses
SPEEDLAN 4100 & 4200 Installation and Operation User Guide
11-18 SNMP Monitoring
• Default TTL
The default value inserted into the Time-To-Live field of the IP header of datagrams
originated at this entity, whenever a TTL value is not supplied by the transport-layer
protocol.
• Datagrams received
The total number of IP datagrams received by the host.
• Header errors
The number of input datagrams discarded due to errors in their IP headers, including bad
checksum errors, version-number mismatch, other format errors, time-to-live exceeded,
errors discovered in processing their IP options, etc.
• Invalid destinations
The number of input datagrams discarded because the IP address in their IP header's
destination field was not a valid address for this entity to receive. This count includes invalid
addresses (i.e., 0.0.0.0) and addresses of unsupported classes (i.e., Class E). For entities
which are not IP gateways and therefore do not forward datagrams, this counter includes
datagrams discarded because the destination address was not a local address.
• Unknown protocols
The number of locally-addressed datagrams received successfully but discarded because of
an unknown or unsupported protocol.
• Input Discards
The number of input IP datagrams for which no problems were encountered to prevent their
continued processing, but which were discarded anyway (e.g., for lack of buffer space).
Note that this counter does not include any datagrams discarded while awaiting re-
assembly.
• Deliveries
The total number of input datagrams successfully delivered to IP user-protocols.
• Output requests
The total number of IP datagrams that are user-protocols (including ICMP) supplied to IP in-
requests for transmission. Note that this counter does not include any datagrams counted in
Datagrams forwarded.
• Output discards
The number of output IP datagrams for which no problem was encountered to prevent their
transmission to their destination, but which were discarded anyway (e.g., for lack of buffer
space). Note that this counter would include datagrams counted in Datagrams forwarded if
any such packets met this (discretionary) discard criterion.