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ZyWALL 5/35/70 Series User’s Guide
15 Table of Contents
11.3.3.2 Service .........................................................................................217
11.3.3.3 Source Address ...........................................................................217
11.3.3.4 Destination Address ....................................................................217
11.4 Connection Direction Examples .....................................................................217
11.4.1 LAN To WAN Rules ...............................................................................217
11.4.2 WAN To LAN Rules ...............................................................................218
11.5 Alerts ..............................................................................................................218
11.6 Firewall Default Rule (Router Mode) ..............................................................219
11.7 Firewall Default Rule (Bridge Mode) ............................................................220
11.8 Firewall Rule Summary .................................................................................222
11.8.1 Firewall Edit Rule ..............................................................................223
11.9 Anti-Probing ................................................................................................226
11.10 Firewall Threshold .....................................................................................227
11.10.1 Threshold Values ................................................................................227
11.10.2 Half-Open Sessions ............................................................................227
11.10.2.1 TCP Maximum Incomplete and Blocking Time ..........................228
11.11 Service .........................................................................................................230
11.11.1 Firewall Edit Custom Service ..............................................................232
11.11.2 Predefined Services ............................................................................233
11.12 Example Firewall Rule ..................................................................................235
Chapter 12
Intrusion Detection and Prevention (IDP) .......................................................... 240
12.1 Introduction to IDP .......................................................................................240
12.1.1 Firewalls and Intrusions ........................................................................240
12.1.2 IDS and IDP .........................................................................................241
12.1.3 Host IDP ..............................................................................................241
12.1.4 Network IDP .........................................................................................241
12.1.5 Example Intrusions ...............................................................................242
12.1.5.1 SQL Slammer Worm ...................................................................242
12.1.5.2 Blaster W32.Worm ......................................................................242
12.1.5.3 Nimda ..........................................................................................242
12.1.5.4 MyDoom ......................................................................................243
12.1.6 ZyWALL IDP .........................................................................................243
Chapter 13
Configuring IDP.................................................................................................... 244
13.1 Overview ........................................................................................................244
13.1.1 Interfaces ..............................................................................................244
13.2 General Setup ................................................................................................245
13.3 IDP Signatures ...............................................................................................246
13.3.1 Attack Types .........................................................................................246
13.3.2 Intrusion Severity ..................................................................................248