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117348-A Rev. A B-1
Appendix B
Examples and Implementation Notes
This appendix contains examples, hints, reminders, and important notes you may
find useful.
Traffic Filter Example for Basic IP Network Security
In a network configuration with a single leased or dial-up connection to the
Internet, one common use for traffic filters is to restrict external access to the
network without restricting outbound service for users.
This section provides a step-by-step example for creating an inbound IP traffic
filter to prevent access to a network through the well-known TCP and UDP ports.
The procedure assumes that you are working at a station that is running Site
Manager.
To further restrict access, you can create additional inbound IP traffic filters to
limit services to specific IP source and destination addresses. “Inbound
Traffic
Filter Examples,” later in this appendix, provides an example of allowing only a
specified subset of Telnet, TFTP, and FTP users.
Topic Page
Traffic Filter Example for Basic IP Network Security B-1
Inbound Traffic Filter Examples B-3
Protocol Prioritization Examples B-7
Implementation Notes
• Filtering Outbound Frame Relay Traffic
• Filtering over a Dial Backup Line
• Using a Drop-All Filter as a Firewall
• Using Outbound Traffic Filters for LAN Protocols
B-11
- Configuring Traffic Filters 1
- Bay Networks Software License 3
- Contents 5
- 117348-A Rev. A 11
- About This Guide 15
- Conventions 16
- Acronyms 17
- Bay Networks Customer Service 19
- How to Get Help 20
- Chapter 1 21
- Using Traffic Filters 21
- Inbound Traffic Filters 22
- Outbound Traffic Filters 23
- Filtering Strategies 24
- Combine Filters 25
- Build a Firewall 25
- Traffic Filter Components 26
- Using Traffic Filters 27
- Predefined Criteria 28
- 1-10 117348-A Rev. A 30
- 1-12 117348-A Rev. A 32
- Using Filter Templates 33
- 1-14 117348-A Rev. A 34
- Chapter 2 35
- Priority Queuing 36
- The Dequeuing Process 37
- 117348-A Rev. A 2-5 39
- 2-6 117348-A Rev. A 40
- 117348-A Rev. A 2-7 41
- 2-8 117348-A Rev. A 42
- Tuning Concepts 44
- 117348-A Rev. A 2-11 45
- Queue Size Example 46
- Reconfiguring Queue Size 46
- Examples 47
- 2-14 117348-A Rev. A 48
- 117348-A Rev. A 2-15 49
- Chapter 3 51
- Transparent Bridge Actions 54
- Predefined SRB Criteria 55
- User-Defined SRB Criteria 56
- SRB Actions 56
- Predefined DECnet Criteria 57
- User-Defined DECnet Criteria 57
- DECnet Actions 57
- DLSw Criteria and Actions 58
- IP Criteria and Actions 59
- IP Actions 60
- IPX Criteria and Actions 61
- LLC2 Criteria and Actions 62
- OSI Criteria and Actions 63
- VINES Criteria and Actions 64
- XNS Criteria and Actions 65
- Chapter 4 67
- Selecting Predefined Criteria 68
- Predefined IP Criteria 70
- 117348-A Rev. A 4-5 71
- Data Link Reference Points 72
- IP Reference Points 74
- Selecting Actions 75
- Prioritizing Actions 76
- Dial Service Actions 76
- 117348-A Rev. A 4-11 77
- Chapter 5 79
- Specifying MAC Address Ranges 80
- SRB Functional MAC Addresses 81
- 5-4 117348-A Rev. A 82
- Table 5-3. SAP Codes 82
- Table 5-4. Frame Relay NLPIDs 83
- Table 5-5. PPP Protocol IDs 83
- 5-6 117348-A Rev. A 84
- 5-8 117348-A Rev. A 86
- 88
- 88
- Chapter 6 89
- 6-2 117348-A Rev. A 90
- 117348-A Rev. A 6-3 91
- 117348-A Rev. A 6-5 93
- 6-8 117348-A Rev. A 96
- 6-10 117348-A Rev. A 98
- 117348-A Rev. A 6-11 99
- 6-12 117348-A Rev. A 100
- 117348-A Rev. A 6-13 101
- 6-14 117348-A Rev. A 102
- 6-16 117348-A Rev. A 104
- 6-18 117348-A Rev. A 106
- 6-20 117348-A Rev. A 108
- Chapter 7 109
- 7-2 117348-A Rev. A 110
- 117348-A Rev. A 7-3 111
- Creating a Template 112
- 113
- 7-6 117348-A Rev. A 114
- 7-8 117348-A Rev. A 116
- Customizing Templates 117
- 7-10 117348-A Rev. A 118
- 117348-A Rev. A 7-11 119
- 7-12 117348-A Rev. A 120
- Drop_Telnet_S42 121
- SRB_DSAP_hiQ 121
- 7-14 117348-A Rev. A 122
- 7-16 117348-A Rev. A 124
- 7-18 117348-A Rev. A 126
- 7-20 117348-A Rev. A 128
- 117348-A Rev. A 7-21 129
- 7-22 117348-A Rev. A 130
- 117348-A Rev. A 7-23 131
- Appendix A 133
- 134
- 117348-A Rev. A A-3 135
- A-4 117348-A Rev. A 136
- 117348-A Rev. A A-5 137
- A-6 117348-A Rev. A 138
- 139
- 140
- Appendix B 141
- 142
- (continued) 143
- B-4 117348-A Rev. A 144
- filtering goals 145
- B-8 117348-A Rev. A 148
- Configuring DLSw 149
- Services 149
- (continued) 149
- B-10 117348-A Rev. A 150
- Implementation Notes 151
- B-12 117348-A Rev. A 152
- 117348-A Rev. A B-13 153
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