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Examples and Implementation Notes
308645-14.00 Rev 00
B-5
Table B-1 lists sample predefined criteria, ranges, and actions for some common
filtering goals.
Table B-1. Predefined Criteria, Ranges, and Actions for Sample Inbound Traffic Filters
Filtering Goal Criteria Path Ranges Action Path Notes
Configure a
subset of
allowed Telnet,
TFTP, and FTP
users
Criteria > Add > IP
Source Address
Client IP source
addresses
Use
dotted-decimal
format.
Action > Add >
Accept
This strategy works only if the
destination IP address is one
of the router’s interfaces and if
the protocol or well-known
port is Telnet, TFTP, or FTP.
Configure a
router to drop
BootP requests
from particular
clients
Criteria > Add >
UDP Frame > UDP
Destination Port
MAC addresses of
the BootP clients
Action > Add >
Drop
Drop inbound
Telnet traffic
Criteria > Add > IP >
TCP Frame > TCP
Destination Port
23
See Table 5-6 in
Chapter 5 for a list
of common TCP
port ranges.
Action > Add >
Drop
For a more secure method,
create a user-defined filter
(see Table B-2
).
This filter will not stop remote
users from establishing a
Telnet session with the router.
To do that, you must also
create outbound traffic filters
on the remote circuits.
- 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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