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Fast Network 10 User Guide Page 5-1
CHAPTER 5
FN10 FILTERS
One of the most significant features of the FN10 is its powerful
user-configurable filtering capabilities. A filter is an instruction to the
FN10
to screen data packets based on the criteria you define. Filtering is
useful for gathering statistics, implementing security measures, and
improving network performance.
The FN10 also supports pseudo filtering. Pseudo filtering provides a
unique traffic monitoring capability, including:
• Determining the effect a filter would have, without actually invoking
it.
• Monitoring traffic patterns to help determine optimum network
design.
• Monitoring potential security threats.
• Evaluating security policies.
You can configure the FN10
to selectively filter network traffic using the
following types of filters:
• Bridge Address Table filters
• Port filters
Although proper use of filters can have a positive effect on the network
performance, excessive use of filters may degrade network performance.
(Refer to Section 5.6.)
5.1 BRIDGE ADDRESS TABLE FILTERS
Bridge Address Table filters use the FN10 Bridge Address Table to
determine if there are any filtering flags assigned to a packet’s source or
destination address. By assigning FN10 Bridge Address Table filter flags,
you can selectively filter:
• Traffic to and/or from any station (Media Access Control (MAC) layer
address).
- FAST NETWORK 10 1
- USER GUIDE 1
- Fast Network 10 User Guide i 3
- CONTENTS 7
- FastNET 10 User Guide vii 9
- Contents 10
- CHAPTER 1 11
- INTRODUCTION 11
- 1.2 GETTING HELP 12
- 1.3 DOCUMENT CONVENTIONS 13
- 1.4 RELATED DOCUMENTATION 14
- 1.5 OVERVIEW 14
- Overview 15
- 1.5.1 FN10 Architecture 16
- 1.5.3 FN10 Filtering 20
- 1.5.4.1 FN10 Trunking 21
- Chapter 1: Introduction 22
- 1.5.4.3 Virtual Workgroups 24
- 1.6 LOCAL CONSOLE MANAGER 25
- Reference Card 26
- 1.6.2 Basic LCM Commands 27
- 1.6.2.1 Help 28
- 1.6.2.2 Erase 28
- 1.6.2.3 Exit 29
- 1.6.2.4 Logout 29
- 1.6.2.5 Traplog 29
- CHAPTER 2 31
- UNPACKING AND INSTALLING 31
- YOUR FN10 31
- Port B Port A 32
- FN10 Panels 33
- 2.2 INSTALLING THE FN10 34
- Installing the FN10 35
- FN10 > prompt 37
- ETHERNET MODULE 39
- CHAPTER 3 43
- CONFIGURING YOUR FN10 43
- • Displaying trunking status 44
- • Assigning a community name 44
- 3.1 ASSIGNING IP ADDRESSES 45
- 3.1.1 Displaying IP Addresses 46
- 3.1.2 Deleting an IP Address 46
- 3.1.3 Changing a Subnet Mask 46
- 3.2 ENABLING BRIDGING 47
- 3.3 DISABLING BRIDGING 48
- 3.5 ENABLING TRUNKING 49
- Trunk Groups 50
- 3.6 DISABLING TRUNKING 51
- FN10 > trunk 2-4 52
- Displaying Trunking Status 53
- Workgroup A 54
- Workgroup B 54
- Assigning a Community Name 57
- RCM Reference Guide 58
- 3.11 MODIFYING MIB VARIABLES 59
- 3.11.1 System Contact 59
- 3.11.2 System Name 59
- 3.11.3 System Location 59
- 3.11.5 Aging Parameter 60
- CHAPTER 4 61
- MONITORING AND MANAGING 61
- 4.2.1 Pseudo Filters 63
- 4.2.2 Gathering Statistics 63
- 4.2.3 System Statistics 63
- FN10 Statistics 65
- 4.2.5 MAC Statistics 66
- 4.2.7 SNMP Statistics 67
- 4.3.1 Displaying Status 69
- 4.4 MANAGING THE FN10 74
- 4.5.1 Disabling a Port 75
- 4.5.2 Enabling a Port 76
- 4.5.2.1 noRIP Option 76
- 4.5.3 Changing a Subnet Mask 77
- 4.5.5 Setting the Baud Rate 78
- 4.5.6 Setting a Reboot Time 79
- CHAPTER 5 81
- FN10 FILTERS 81
- 5.1.1 Source Address Filter 83
- 5.2 PORT FILTERS 84
- 5.2.1 Configurable Fields 85
- 5.2.1.1 Pseudo Filtering 86
- 5.2.1.2 Filter Links 86
- Port Filters 87
- Adjoining Network Segment 91
- Computers that cannot 93
- PERFORMANCE 96
- LAN 4LAN 3 97
- 5.5 CONFIGURING A PORT FILTER 99
- Chapter 5: FN10 Filters 100
- Configuring a Port Filter 101
- 5.5.1 Modifying a Port Filter 102
- 5.5.2 Deleting a Port Filter 103
- CONSIDERATIONS 103
- CHAPTER 6 105
- 6.1.1 Power-up LED Sequence 106
- 6.1.2 Specific Power-up Tests 106
- 6.3 DIAGNOSTIC LOOPBACK TESTS 107
- 6.3.1 Loopback Tests 108
- 123456 7 111089 109
- Reset Ready 109
- 6.5 TROUBLESHOOTING 111
- 6.5.1 FN10 Does Not Power Up 111
- 6.5.2 Connectivity Problems 111
- 6.5.3 FN10 Has Rebooted 112
- APPENDIX A 113
- TECHNICAL SPECIFICATIONS 113
- Bridging Technologies 114
- Address Table Size 114
- Management Support 114
- Certification 114
- A.3 10BASE-T PIN ASSIGNMENTS 115
- A.4 STRAIGHT-THROUGH WIRING 116
- A.5 CROSSOVER WIRING 117
- A.6 5 - 4 - 3 RULE 117
- APPENDIX B 119
- GLOSSARY 119
- Appendix B: Glossary 120
- Numerics 129
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