D-Link NetDefendOS

Table of Contents
Preface ............................................................................................................... 17
1. NetDefendOS Overview ..................................................................................... 20
1.1. Features ............................................................................................... 20
1.2. NetDefendOS Architecture ...................................................................... 24
1.2.1. State-based Architecture .............................................................. 24
1.2.2. NetDefendOS Building Blocks ........................................................ 24
1.2.3. Basic Packet Flow ......................................................................... 25
1.3. NetDefendOS State Engine Packet Flow ..................................................... 28
2. Management and Maintenance .......................................................................... 33
2.1. Managing NetDefendOS ......................................................................... 33
2.1.1. Overview .................................................................................... 33
2.1.2. Configuring Management Access ................................................... 34
2.1.3. Administrator Account ................................................................. 40
2.1.4. The Web Interface ........................................................................ 41
2.1.5. The CLI ....................................................................................... 46
2.1.6. CLI Scripts ................................................................................... 58
2.1.7. Secure Copy ................................................................................ 64
2.1.8. The Console Boot Menu ................................................................ 66
2.1.9. RADIUS Management Authentication ............................................. 67
2.1.10. Management Advanced Settings .................................................. 70
2.1.11. Working with Configurations ....................................................... 71
2.2. System Date and Time ............................................................................ 78
2.2.1. Overview .................................................................................... 78
2.2.2. Setting Date and Time Manually ..................................................... 78
2.2.3. Daylight Saving Time ................................................................... 79
2.2.4. Using External Time Servers ........................................................... 82
2.2.5. Settings Summary for Date and Time .............................................. 85
2.3. Events and Logging ................................................................................ 87
2.3.1. Overview .................................................................................... 87
2.3.2. Log Messages ............................................................................. 87
2.3.3. Log Receiver Types ...................................................................... 88
2.3.4. The Memory Log Receiver (Memlog) ............................................... 89
2.3.5. The Syslog Log Receiver ................................................................ 89
2.3.6. Mail Alerting ............................................................................... 92
2.3.7. Severity Filter and Message Exceptions ........................................... 96
2.3.8. SNMP Traps ................................................................................ 97
2.3.9. Advanced Log Settings ................................................................. 98
2.3.10. Logsnoop ................................................................................. 99
2.4. Monitoring .......................................................................................... 103
2.4.1. Real-time Monitor Alerts ............................................................. 103
2.4.2. The Link Monitor ....................................................................... 103
2.4.3. Hardware Monitoring ................................................................. 107
2.4.4. Memory Monitoring Settings ....................................................... 109
2.5. SNMP ................................................................................................. 111
2.5.1. Management with SNMP ............................................................ 111
2.5.2. Persistent SNMP Interface Indexes ................................................ 115
2.5.3. SNMP Advanced Settings ............................................................ 116
2.6. Diagnostic Tools .................................................................................. 118
2.6.1. Overview .................................................................................. 118
2.6.2. The ping Command .................................................................... 118
2.6.3. The stats Command ................................................................... 122
2.6.4. The connections Command ......................................................... 123
2.6.5. The dconsole Command .............................................................. 125
2.6.6. The pcapdump Command ........................................................... 126
2.6.7. The traceroute Command ............................................................ 128
2.6.8. The frags Command ................................................................... 131
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