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Firewall Tutorial
General firewall terms
☛ Note:
Breakwater Basic Firewall (see “BreakWater Basic Firewall” on page 125)
does not make use of the packet filter support and can be used in addition to
filtersets
Filter rule: A filter set is comprised of individual filter rules.
Filter set: A grouping of individual filter rules.
Firewall: A component or set of components that restrict access between a protected net-
work and the Internet, or between two networks.
Host: A workstation on the network.
Packet: Unit of communication on the Internet.
Packet filter: Packet filters allow or deny packets based on source or destination IP
addresses, TCP or UDP ports.
Port: A number that defines a particular type of service.
Basic IP packet components
All IP packets contain the same basic header information, as follows:
Source IP Address 163.176.132.18
Destination IP Address 163.176.4.27
Source Port 2541
Destination Port 80
- Software User Guide 1
- Copyright 2
- Expert Mode 4
- Command Line Interface 8
- Table of Contents 10
- CHAPTER 1 Introduction 13
- About Netopia Documentation 14
- Intended Audience 14
- Documentation Conventions 15
- Organization 17
- A Word About Example Screens 17
- CHAPTER 2 Basic Mode Setup 19
- ☛ CAUTION: 20
- ☛ Achtung: 21
- Microsoft Windows: 22
- Then go to Step 2 23
- Connect to the Internet 27
- PPPoE Quickstart 28
- Home Page - Basic Mode 31
- Link: Manage My Account 33
- Link: Status Details 34
- Enable Rmt Mgmt 35
- Link: Expert Mode 36
- Link: Update Firmware 37
- CHAPTER 3 Expert Mode 39
- Expert Mode 40
- Home Page - Expert Mode 41
- Home Page - Information 42
- Link: Breadcrumb Trail 44
- Button: Restart 45
- Link: Alert Symbol 46
- Button: Help 47
- Button: Configure 48
- Link: Quickstart 48
- Link: LAN 50
- Wireless 53
- (supported models) 53
- Advanced 57
- Multiple SSIDs 62
- Wireless MAC Authorization 63
- MAC Authorization 64
- RADIUS Server 67
- Link: WAN 68
- ATM Traffic Shaping 69
- Link: Advanced 72
- Link: IP Static Routes 73
- Link: IP Static ARP 75
- Link: Pinholes 75
- Application 1 76
- Application 2 76
- Application 3 76
- Add or Edit more Pinholes 80
- NAT/PAT Table 84
- Link: Default Server 85
- Link: Differentiated Services 89
- Link: DNS 92
- Link: DHCP Server 92
- Link: RADIUS Server 94
- Link: SNMP 95
- Link: UPnP 100
- Link: LAN Management 101
- ☛ NOTE: 102
- Configuring for Bridge Mode 103
- Enable System Bridge 104
- Save and 105
- Restart 105
- Link: VLAN 106
- Configure 107
- ☛ Note: 109
- Link: System 111
- Link: Syslog Parameters 111
- Log Event Messages 113
- Access-related Log Messages 114
- Link: Internal Servers 116
- Link: Software Hosting 116
- Rome, v.1.0 117
- Age of Wonders 117
- Rename a User(PC) 119
- Link: Time Zone 121
- Button: Security 122
- Link: Passwords 123
- • ICMP • HTTP • FTP 127
- • SNMP • telnet • DHCP 127
- Link: IPSec 130
- SafeHarbour IPSec VPN 131
- Security 133
- Save and Restart 135
- Exposed Addresses 141
- Add more Exposed Addresses 142
- Port Protocol Description 145
- LAN (Private) 145
- Interface 145
- WAN (Public) 145
- Basic protocol types 147
- Firewall design rules 148
- Firewall Tutorial 149
- Example filter set page 150
- Internet 151
- IP 200.1.1.?? 151
- Input Packet 151
- Example filters 152
- Packet Filter 154
- How individual filters work 156
- Design guidelines 163
- 9. From the 169
- Deleting a filter set 170
- Ethernet 100BT 171
- TOS field matching 173
- Link: Security Log 176
- Button: Install 179
- Link: Install Software 180
- Step 1: Required Files 181
- Install Software 182
- Link: Install Keys 184
- Install Key 185
- Restart the Gateway 186
- Link: Install Certificate 188
- Install Certificate 189
- • read the Quickstart Guide; 191
- Status Indicator Lights 192
- ETHER NET 194
- ☛ Special patterns: 197
- DSL Sync: 198
- LAN 1, 2, 3, 4: 198
- Netopia Gateway 3347W, 3347 199
- WG status indicator lights 199
- Front View 200
- LED Function Summary Matrix 201
- Factory Reset Switch 203
- Home Page 206
- Item Description 207
- Button: Troubleshoot 208
- Link: System Status 209
- Link: Ports: Ethernet 210
- Link: Ports: DSL 211
- Link: IP: Interfaces 212
- Link: System Log: Entire 214
- Link: Diagnostics 215
- Link: Network Tools 216
- button 217
- TraceRoute 218
- Overview 222
- CONFIG Commands 223
- Logging In 224
- Ending a CLI Session 224
- Using the CLI Help Facility 225
- About SHELL Commands 225
- SHELL Commands 226
- CODE Description 227
- MAC_address 234
- About CONFIG Commands 237
- Netopia-3000/9437188 > 238
- Guidelines: CONFIG Commands 240
- Common Commands 245
- Dynamic DNS Settings 248
- Ethernet LAN Settings 252
- netmask 260
- SafeHarbour IPSec Settings 270
- Stateful Inspection 276
- Example: 277
- Operator Action 280
- • Type save 289
- Wireless Privacy Settings 293
- RADIUS Server Settings 296
- 123.45.678.910 300
- ☛ CAUTION! 302
- VDSL Parameter Defaults 303
- Parameter Default Meaning 303
- Parameter Accepted Values 304
- Glossary 311
- -----B 312
- -----C 313
- -----D 314
- -----E 315
- -----F 316
- -----H 317
- -----I 318
- Internet Key Exchange (IKE) 319
- -----N 320
- -----P 321
- -----Q 322
- -----R 322
- MD5 SHA1 323
- 1 and 1,000,000 MB 324
- -----T 325
- -----U 325
- -----V 325
- -----W 326
- -----X 326
- ■ 12 VDC input 327
- Agency approvals 329
- ☛ Warnings: 330
- ☛ Important 331
- Important Safety Instructions 332
- 47 CFR Part 68 Information 333
- RF Exposure Statement: 334
- Electrical Safety Advisory 334
- • “Management” on page 338 335
- • “Security” on page 339 335
- Wide Area Network Termination 336
- DNS Proxy 337
- Netopia Gateway 340
- ☛ WARNING: 342
- Netopia, Inc 351
- 6001 Shellmound Street 351
- Emeryville, CA 94608 351
- April 10, 2006 351
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