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Security 10-43
Since the Source IP Network Address in the Router is 01100000, and the source IP address after the logical
AND is 1011000, this rule does
not
match and this packet will be forwarded.
Example 4
Incoming packet has the source address of 200.1.1.104.
Since the Source IP Network Address in the Router is 01100000, and the source IP address after the logical
AND is 01100000, this rule
does
match and this packet will
not
be forwarded.
Example 5
Incoming packet has the source address of 200.1.1.96.
255.255.255.240 11110000 (Perform the logical AND)
10110000 (Logical AND result)
Filter Rule: 200.1.1.96 (Source IP Network Address)
255.255.255.240 (Source IP Mask)
Forward = No (What happens on match)
IP Address Binary Representation
200.1.1.104 01101000 (Source address in incoming IP packet)
AND
255.255.255.240 11110000 (Perform the logical AND)
01100000 (Logical AND result)
Filter Rule: 200.1.1.96 (Source IP Network Address)
255.255.255.255 (Source IP Mask)
Forward = No (What happens on match)
IP Address Binary Representation
200.1.1.96 01100000 (Source address in incoming IP packet)
AND
- Copyright 2
- Part Number 2
- Console-based Management 12
- Netopia Console Menus 12
- Netopia Models 13
- Configuring Telnet software 14
- Example back panel 15
- 1-8 Firmware User Guide 18
- WAN Configuration 19
- ADSL Line Configuration screen 20
- SDSL/IDSL Configuration screen 21
- IDSL Line Configuration screen 23
- T1 Line Configuration screen 25
- Frame Relay Configuration 27
- Frame Relay DLCI configuration 29
- Multiple ATM PVC overview 34
- Multiple ATM PVC configuration 34
- Editing circuits 38
- Changing a circuit 39
- The Default Profile 46
- Scheduled Connections 47
- Viewing scheduled connections 48
- Adding a scheduled connection 49
- Set Weekly Schedule 50
- Set Once-Only Schedule 51
- System Configuration Screens 53
- Filter Sets 54
- Stateful Inspection firewall 55
- Stateful Inspection Options 56
- Exposed Addresses 58
- Date and time 60
- Console Configuration 61
- Security 61
- Upgrade Feature Set 61
- RFC-1483 Transparent Bridging 62
- 2-48 Firmware User Guide 66
- Features 68
- Dynamic mapping 69
- WAN Network 70
- LAN Network 70
- Supported traffic 71
- MultiNAT Configuration 72
- IP setup 73
- NAT rules 75
- Add Map 76
- Modifying map lists 79
- Adding Server Lists 81
- Modifying server lists 84
- Deleting a server 86
- IP profile parameters 87
- IP Parameters 89
- NAT Associations 91
- 3-26 Firmware User Guide 92
- IP Passthrough 93
- 3-28 Firmware User Guide 94
- First Come First Serve Mode 95
- A restriction 96
- MultiNAT Configuration Example 97
- Notes on the example 100
- 3-36 Firmware User Guide 102
- Overview 103
- Transit Internetwork 104
- About PPTP Tunnels 106
- About IPsec Tunnels 109
- About ATMP Tunnels 110
- Encryption Support 112
- ATMP/PPTP Default Profile 113
- VPN QuickView 115
- Dial-Up Networking for VPN 116
- Installing the VPN Client 119
- Windows 98 VPN installation 120
- PPTP example 122
- ATMP example 124
- Windows Networking Broadcasts 127
- 4-26 Firmware User Guide 128
- 4-28 Firmware User Guide 130
- Adding an IKE Phase 1 Profile 134
- Key Management 139
- Enhanced Dead Peer Detection 142
- Multiple Network IPsec 144
- IPsec Manual Key Entry 149
- VPN Quickview 150
- IP Setup 154
- IP subnets 156
- Static routes 158
- Viewing static routes 159
- Adding a static route 160
- Modifying a static route 161
- Deleting a static route 161
- RIP-2 MD5 Authentication 162
- IP Setup 6-11 163
- The IP Setup screen appears 163
- 6-12 Firmware User Guide 164
- Adding a key 166
- Changing or deleting a key 167
- IP Address Serving 169
- IP Address Pools 172
- DHCP NetBIOS Options 174
- More Address Serving Options 176
- IP Setup 6-29 181
- DHCP Relay Agent 182
- Connection Profiles 184
- Multicast Forwarding 186
- External Dial Backup Support 190
- Backup Configuration screen 193
- Management/Statistics 198
- QuickView 200
- Event Logs 200
- SNMP Support 201
- Backup Default Gateway 201
- IP Setup screen 203
- Backup Management/Statistics 204
- 7-18 Firmware User Guide 206
- Introduction 207
- Configuring the Voice Features 208
- Quick View Status Overview 211
- General status 212
- Current status 213
- Status lights 213
- Statistics & Logs 214
- Event Histories 214
- WAN Event History 215
- Device Event History 215
- IP Routing Table 217
- General Statistics 217
- Physical Interface 218
- Network Interface 218
- System Information 219
- ATM MIB (RFC2515) 220
- ADSL: ADSL MIB (RFC2662) 220
- The SNMP Setup screen 221
- SNMP traps 222
- Setting the IP trap receivers 223
- Viewing IP trap receivers 223
- Modifying IP trap receivers 223
- Deleting IP trap receivers 223
- 9-14 Firmware User Guide 224
- Suggested Security Measures 225
- UPnP Support 226
- Superuser configuration 227
- Limited user configuration 228
- Advanced Security Options 229
- User access password 231
- User menu differences 232
- WAN Configuration screens 233
- System Configuration menu 235
- IP Setup menu 235
- X-Modem File Transfer menu 236
- Statistics & Logs menu 236
- Security 10-13 237
- Quick Menus 238
- User Accounts 239
- Telnet Access 241
- About Filters and Filter Sets 242
- Filter priority 243
- How individual filters work 244
- Parts of a filter 245
- Port numbers 245
- Port number comparisons 246
- Other filter attributes 246
- Putting the parts together 247
- Filtering example #1 248
- Filtering example #2 248
- Design guidelines 249
- An approach to using filters 250
- Adding a filter set 251
- Adding filters to a filter set 252
- Viewing filters 254
- Modifying filters 254
- Deleting a filter set 255
- A sample filter set 255
- Possible modifications 257
- TOS field matching 259
- Firewall Tutorial 261
- Firewall design rules 262
- Binary representation 263
- Logical AND function 263
- Implied rules 263
- Filter basics 264
- Example network 265
- Example 1 265
- Example 2 266
- Example 3 266
- Example 4 267
- Example 5 267
- Configuration Management 268
- 10-46 Firmware User Guide 270
- TFTP and X-Modem 271
- Call Filtering 272
- 10-50 Firmware User Guide 274
- Trace Route 278
- Telnet Client 279
- Factory Defaults 280
- Updating firmware 281
- Downloading configuration files 282
- Uploading configuration files 283
- Restarting the System 286
- Configuration Problems 289
- Console connection problems 290
- Network problems 290
- Power Outages 291
- Technical Support 292
- What is IP? 293
- About IP Addressing 293
- Subnets and subnet masks 294
- Subnet masks 295
- Network configuration 296
- Distributing IP Addresses 297
- Configuration 299
- Using address serving 300
- A DHCP example 302
- Nested IP Subnets 303
- Internet 304
- Broadcasts 306
- Binary Conversion Table C-1 307
- C-2 Firmware User Guide 308
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