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Configuring IP Inbound Traffic Filters Using the BCC
308645-14.00 Rev 00
8-5
You cannot specify a precedence value greater than the maximum allowable
number of traffic filters (31 in nonextended mode and 127 in extended mode). For
more information about nonextended and extended traffic filtering modes, see
“Extended and Nonextended Filtering Modes” on page 8-6
.
Filter Criteria and Actions
When you create an IP traffic filter template or an inbound IP traffic filter, you
must apply IP-specific filter criteria and actions.
You can filter IP inbound traffic based on specified bit patterns in one of the
following headers in an IP datagram:
•IP header
• Header of the upper-layer protocol (TCP or UDP)
The BCC provides default filter criteria (predefined criteria) for inbound traffic
filters. Predefined criteria consist of predefined offsets and lengths from common
reference points in the IP header. Table 3-2 on page 3-3 lists the predefined
criteria for IP inbound traffic filters with the reference field, offset, and length of
each criterion.
In addition to the predefined filter criteria, you can also define a criterion for
creating IP inbound traffic filters (user-defined criteria) based on bit patterns in
the packet header. You apply user-defined criteria by specifying an offset and
length to the following reference fields in the IP header. Table 3-7 on page 3-10
lists the user-defined criteria for creating inbound traffic filters.
IP Filtering Actions
The filter action determines what happens to packets that match the filter criteria.
You can configure IP inbound traffic filters to perform the following actions:
• Accept
The router processes any packet that matches the filter criteria.
•Drop
The router does not route any packet that matches the filter criteria.
•Log
- Protocol Prioritization 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 308645-14.00 Rev 00 10
- Before You Begin 15
- Text Conventions 16
- Acronyms 17
- Hard-Copy Technical Manuals 20
- 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
- Predefined Criteria 28
- User-Defined Criteria 30
- Using Filter Templates 33
- Chapter 2 35
- Priority Queuing 36
- The Dequeuing Process 37
- Tuning Concepts 45
- Queue Size Example 47
- Reconfiguring Queue Size 47
- Examples 48
- Chapter 3 51
- Ethernet Header 52
- IEEE 802.2 LLC Header 52
- header 53
- 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
- User-Defined XNS Criteria 66
- XNS Actions 66
- Chapter 4 67
- Selecting Predefined Criteria 68
- Traffic Filters 69
- Predefined IP Criteria 71
- Data Link Reference Points 73
- IP Reference Points 75
- Selecting Actions 76
- Prioritizing Actions 77
- Dial Service Actions 77
- Chapter 5 79
- Specifying MAC Address Ranges 80
- SRB Functional MAC Addresses 81
- Table 5-3. SAP Codes 82
- Table 5-4. Frame Relay NLPIDs 83
- Table 5-5. PPP Protocol IDs 83
- Table 5-7 84
- Chapter 6 89
- Chapter 7 109
- Creating a Template 112
- (continued) 113
- (continued) 115
- Customizing Templates 117
- Drop_Telnet_S42 121
- SRB_DSAP_hiQ 121
- Chapter 8 133
- Configuring IP Inbound 133
- Traffic Filters Using the BCC 133
- IP Traffic Filter Templates 134
- IP Inbound Traffic Filters 135
- Filter Precedence 136
- Filter Criteria and Actions 137
- <name> 139
- Caution: 140
- Templates 141
- Criteria 142
- Example - Source TCP Port 144
- Example - Source UDP Port 145
- <list_of_values> 147
- <ip_address> 149
- <ip_address> 149
- Specifying the Log Action 151
- Configuration Examples 152
- Appendix A 155
- Appendix B 163
- TCP and UDP ports: 164
- S41_accepted 165
- Length Range 168
- Configuring DLSw 171
- Services 171
- Implementation Notes 173
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