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How Firewall Rule Enforcement Works
X Family LSM User’s Guide V 2.5.1 65
STEP 1
The user starts a web browser. The web browser resolves the DNS name for the URL and
initiate a TCP connection to the target web server via the X family device.
STEP 2
The X family device inspects the session header and identifies the following information
about the request:
• Source IP — The address of the device that initiated the request.
• Destination IP — The address of the device for which the request is intended.
• Application — Type of service/content and authenticated user (if any).
STEP A
Using its routing table, the device decides which Security Zone the session has come
from and which zone it is going to.
STEP 3
The device searches for the first firewall rule in its list that matches the session request. Rules
are evaluated based on what options are configured:
•user authentication
• IP protocol service
• schedule
•source zone
• destination zone
• web filtering
- X Family 1
- Local Security Manager 1
- User’s Guide 1
- 3Com Corporation 2
- 350 Campus Drive 2
- Marlborough, MA 01752 2
- Chapter 3. IPS Filtering 15 4
- Chapter 4. Firewall 63 4
- Chapter 6. Network 129 6
- Chapter 7. VPN 181 7
- Chapter 8. System 217 7
- Glossary 307 9
- Index 315 9
- Contents 10
- About This Guide 11
- Conventions 12
- Screen Captures 13
- Messages 13
- Related Documentation 14
- Customer Support 14
- Contact Information 15
- System Overview 17
- Core Functionality 18
- X Family Environment 19
- Local Clients 20
- System Requirements 20
- SMS Configuration 20
- LSM Navigation 21
- Logging In 22
- Logging In 23
- Figure 2–1: LSM Logon Page 23
- LSM Screen Layout 24
- Main Menu Bar 25
- Navigation 26
- Content and Functionality 27
- System Summary 28
- Log Summary 29
- Product Specifications 30
- IPS Filtering 31
- Using the IPS 32
- Security Profiles 33
- Chapter 3 IPS Filtering 34
- Managing Security Profiles 35
- Security Profile Details 36
- Security Profiles 37
- Filter Components 40
- Configuring DV Filters 41
- View DV Filters 42
- Filter Search 43
- Filters List (All Filters) 43
- Filter List Details 44
- Address 50
- Reset an Individual Filter 51
- Port Scan/Host Sweep Filters 51
- Filter Tuning 52
- Traffic Threshold Filters 54
- Traffic Threshold Details 55
- Column Definition 56
- Traffic Threshold Filters 57
- Action Sets 60
- Action Set Configurations 61
- Default Action Sets 62
- Managing Actions 63
- Rate Limit Action Set 65
- Quarantine Action Set 65
- Action Sets 67
- Notification Contacts 68
- Notification Contacts 69
- IPS Services 71
- IPS Services Page Details 72
- Preferences 75
- Adaptive Filter Configuration 76
- Click Apply 77
- Firewall 79
- Chapter 4 Firewall 80
- Default Firewall Rules 83
- Managing Firewall Rules 84
- Firewall Rules List Details 85
- Configuring Firewall Rules 87
- Configuration Notes 88
- Firewall Services 91
- Configuring Service Groups 94
- Schedules 95
- Managing Schedules 97
- Virtual Servers 98
- Virtual Servers page 99
- Configuring Virtual Servers 100
- Web Filtering 101
- How Web Filtering Works 102
- Setting Up Web Filtering 103
- Web Filtering Page 104
- Web Filtering 105
- Parameter Description 105
- Web Filter Service 106
- Custom Filter List 108
- Parameter/Function 109
- Configure URL Patterns 110
- Value Description 111
- URL Test 112
- Events: Logs, Traffic 113
- Streams, Reports 113
- Overview 114
- Alert Log 115
- Audit Log 116
- IPS Block Log 117
- Firewall Block Log 118
- Firewall Session Log 119
- Configuration 120
- System Log 121
- Managing Logs 122
- Viewing Logs 123
- Downloading a Log 123
- Resetting a log 124
- Searching a Log 125
- Managed Streams 126
- Managed Streams 127
- Field Description 127
- Rate Limited Streams 128
- Quarantined Addresses 129
- Column Description 130
- • Performance/Throughput 132
- Device Health 133
- Module Health 134
- Table 5–13: Module Health 135
- Performance/Throughput 136
- Port Health 136
- Reports 137
- Attack Reports 138
- Rate Limit Reports 139
- Traffic Reports 139
- Update report data 140
- Traffic Threshold Report 141
- Quarantine Report 141
- Firewall Reports 142
- Configuration Overview 146
- Deployment Modes 147
- Network Port Configuration 148
- Port Configuration Tasks 149
- Chapter 6 Network 150
- Security Zone Configuration 151
- Preconfigured Zones Ports 152
- Security Zone Configuration 153
- IP Interfaces 156
- Managing IP Interfaces 157
- IP Interfaces 159
- Configuring a GRE Tunnel 164
- Bridge Mode for IP Interfaces 166
- RIP for IP Interfaces 166
- RIPv1 Configuration Settings 167
- RIPv2 Configuration Settings 167
- IP Address Groups 169
- Default Gateway 172
- Routing Table 173
- Static Routes 175
- RIP Setup 176
- Routing 177
- Multicast (IGMP and PIM-DM) 179
- PIM-DM Setup 181
- DHCP Server 183
- DHCP Server Page 184
- Configure DHCP Server 185
- DHCP Relay 187
- Configuring DHCP Relay 188
- Static Reservations 190
- Network Tools 192
- DNS Lookup 193
- Find Network Path 193
- Traffic Capture 193
- Traceroute 195
- About VPN 198
- VPN Configuration Overview 199
- IPSec Configuration 200
- IPSec Status Details 201
- Chapter 7 VPN 202
- IPSec Configuration 205
- IKE Proposal 214
- IKE Proposal Details 215
- Configuring IKE Proposals 216
- IKE Proposal 217
- L2TP Configuration 224
- L2TP Status Page Details 225
- L2TP Server Configuration 226
- L2TP Configuration 227
- PPTP Configuration 228
- PPTP Server Configuration 229
- PPTP Configuration 231
- Chapter 8 System 234
- Persistent Settings 236
- Updating the TOS Software 240
- System Snapshots 243
- Time Options 245
- Figure 8–3: Time Options Page 246
- Internal CMOS Clock 247
- NTP Server 247
- Time Zones 248
- SMS/NMS 249
- High Availability 251
- How High Availability Works 252
- Email Server 257
- Syslog Servers 258
- Setup Wizard 258
- Authentication 261
- User List 262
- TOS and Local User Accounts 263
- TOS User Security Level 263
- Managing User Accounts 265
- Chapter 9 Authentication 268
- Privilege Groups 269
- X.509 Certificates 271
- CA Certificates 273
- Certificate Requests 276
- Managing Certificate Requests 278
- Local Certificates 279
- Preferences 282
- Preferences Parameter Details 283
- Browser Certificates 287
- Client Authentication Message 288
- Security Alert 289
- Certificate Authority 290
- Security Alert 291
- Invalid Certificate Name 293
- Figure A–11: HOSTS File 294
- Core Categories 298
- Gambling 299
- Hate Speech 299
- Violence 299
- Productivity Categories 300
- Advertisement 301
- Arts & Entertainment 301
- Computing & Internet 301
- Education 301
- Appendix B Web Filter Service 302
- Free 14-day Trial Period 306
- Log Formats and System 307
- Log Formats 308
- Audit Log Format 310
- Field Name Description 311
- Firewall Block Log Format 312
- Firewall Session Log Format 314
- VPN Log Format 315
- System Log Format 316
- Remote Syslog Log Format 317
- System Update Status Messages 319
- Device Maximum 321
- Parameter X5 X506 322
- Glossary 323
- X family device 328
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