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Configuring Traffic Filters and Protocol Prioritization
8-16
308645-14.00 Rev 00
Specifying User-Defined Criteria
You can specify user-defined criteria in IP inbound traffic filters and templates by
specifying an offset and length based on the reference fields in the IP header.
To specify user-defined criteria, navigate to the match prompt (for example,
box;
ip; filter-template/template1; match
) and enter:
user-defined reference
<value>
offset
<value>
bitwidth
<value>
range
<value>
reference
is a known bit position in the packet header.
offset
specifies the first position of the filtered bit pattern in relation to the
reference point (measured in bits).
bitwidth
specifies the total bit length that matches the packet criteria.
range
specifies a minimum and maximum target value to apply to the match
criterion. For a single value, you must specify the minimum value in hexadecimal
format. You can precede the value with 0x.
Example
This example specifies user-defined criteria to create an IP traffic filter template
that drops every packet that has a value of 192 at offset 96 from the beginning of
the IP header.
match/template/template1#
user-defined reference start-ip-header offset
96
bitwidth 16 range 0192
user-defined/template/template1/start-ip-header/96/16/0192#
back
match/template/template1#
back
filter-template/template1#
actions
actions/template/template1#
action drop
Specifying the Action of Inbound Traffic Filters and
Templates
By default, the action of each IP inbound traffic filter is to accept the packet if it
matches all of the filter’s match criteria. To change the filtering actions, navigate
to the actions prompt (for example,
box; ip; filter-template/telnet-in; actions)
and
specify one or more of the actions described in Table 8-5.
- 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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