Contents vii
G
Simple Network Management Protocol (SNMP)............... 8-10
The SNMP Setup screen..................................... 8-11
SNMP traps....................................................... 8-12
Chapter 9 — Security ...............................................................9-1
Suggested Security Measures......................................... 9-1
Telnet Tiered Access – Two Password Levels ................... 9-2
UPnP Support...................................................... 9-2
Superuser configuration ....................................... 9-3
Limited user configuration .................................... 9-4
Advanced Security Options ................................... 9-6
User access password ......................................... 9-8
User menu differences......................................... 9-9
Telnet Access .............................................................. 9-16
About Filters and Filter Sets.......................................... 9-17
What’s a filter and what’s a filter set? ................. 9-17
How filter sets work ........................................... 9-17
How individual filters work .................................. 9-18
Design guidelines .............................................. 9-23
Working with IP Filters and Filter Sets............................ 9-24
Adding a filter set............................................... 9-25
Deleting a filter set ............................................ 9-29
A sample filter set.............................................. 9-29
Policy-based Routing using Filtersets............................. 9-32
TOS field matching............................................. 9-33
Firewall Tutorial ........................................................... 9-35
General firewall terms ........................................ 9-35
Basic IP packet components............................... 9-35
Basic protocol types........................................... 9-35
Firewall design rules .......................................... 9-36
Filter basics....................................................... 9-38
Example filters................................................... 9-39
Configuration Management........................................... 9-42
