Contents vii
G
About ATMP Tunnels................................................... 12-20
ATMP configuration.......................................... 12-20
Allowing VPNs through a Firewall................................. 12-23
PPTP example.................................................. 12-24
ATMP example................................................. 12-27
Chapter 13 — Security ........................................................... 13-1
Suggested Security Measures....................................... 13-1
User Accounts............................................................. 13-1
Telnet Access.............................................................. 13-3
About Filters and Filter Sets.......................................... 13-4
What’s a filter and what’s a filter set?................. 13-4
How filter sets work ........................................... 13-4
How individual filters work .................................. 13-6
Design guidelines............................................ 13-10
Working with IP Filters and Filter Sets.......................... 13-11
Adding a filter set............................................. 13-12
Viewing filter sets ............................................ 13-15
Modifying filter sets.......................................... 13-16
Deleting a filter set .......................................... 13-16
A sample IP filter set........................................ 13-16
Firewall Tutorial ......................................................... 13-19
General firewall terms...................................... 13-19
Basic IP packet components............................. 13-20
Basic protocol types......................................... 13-20
Firewall design rules ........................................ 13-21
Filter basics..................................................... 13-23
Example filters................................................. 13-24
LAN IP Filtersets.............................................. 13-27
RADIUS Client Support............................................... 13-30
RADIUS client configuration .............................. 13-30
Warning alerts................................................. 13-32