D-Link DFL-260E

4.7. Transparent Mode ................................................................................ 233
4.7.1. Overview ................................................................................. 233
4.7.2. Enabling Internet Access ............................................................. 238
4.7.3. Transparent Mode Scenarios ........................................................ 239
4.7.4. Spanning Tree BPDU Support ...................................................... 243
4.7.5. Advanced Settings for Transparent Mode ....................................... 244
5. DHCP Services .............................................................................................. 249
5.1. Overview ............................................................................................ 249
5.2. DHCP Servers ..................................................................................... 250
5.2.1. Static DHCP Hosts ..................................................................... 253
5.2.2. Custom Options ......................................................................... 255
5.3. DHCP Relaying ................................................................................... 256
5.3.1. DHCP Relay Advanced Settings ................................................... 257
5.4. IP Pools ..............................................................................................259
6. Security Mechanisms ....................................................................................... 263
6.1. Access Rules ....................................................................................... 263
6.1.1. Overview ................................................................................. 263
6.1.2. IP Spoofing .............................................................................. 264
6.1.3. Access Rule Settings .................................................................. 264
6.2. ALGs ................................................................................................. 266
6.2.1. Overview ................................................................................. 266
6.2.2. The HTTP ALG ........................................................................ 267
6.2.3. The FTP ALG ........................................................................... 270
6.2.4. The TFTP ALG ......................................................................... 279
6.2.5. The SMTP ALG ........................................................................ 280
6.2.6. The POP3 ALG ......................................................................... 289
6.2.7. The PPTP ALG .........................................................................290
6.2.8. The SIP ALG ............................................................................ 291
6.2.9. The H.323 ALG ........................................................................ 302
6.2.10. The TLS ALG .........................................................................316
6.3. Web Content Filtering ........................................................................... 319
6.3.1. Overview ................................................................................. 319
6.3.2. Active Content Handling .............................................................319
6.3.3. Static Content Filtering ...............................................................320
6.3.4. Dynamic Web Content Filtering ................................................... 322
6.4. Anti-Virus Scanning ............................................................................. 337
6.4.1. Overview ................................................................................. 337
6.4.2. Implementation ......................................................................... 337
6.4.3. Activating Anti-Virus Scanning ....................................................338
6.4.4. The Signature Database .............................................................. 338
6.4.5. Subscribing to the D-Link Anti-Virus Service ................................. 339
6.4.6. Anti-Virus Options ..................................................................... 339
6.5. Intrusion Detection and Prevention .......................................................... 343
6.5.1. Overview ................................................................................. 343
6.5.2. IDP Availability for D-Link Models .............................................. 343
6.5.3. IDP Rules ................................................................................. 345
6.5.4. Insertion/Evasion Attack Prevention .............................................. 347
6.5.5. IDP Pattern Matching ................................................................. 348
6.5.6. IDP Signature Groups ................................................................. 349
6.5.7. IDP Actions ..............................................................................350
6.5.8. SMTP Log Receiver for IDP Events .............................................. 351
6.6. Denial-of-Service Attack Prevention ........................................................355
6.6.1. Overview ................................................................................. 355
6.6.2. DoS Attack Mechanisms ............................................................. 355
6.6.3. Ping of Death and Jolt Attacks ..................................................... 355
6.6.4. Fragmentation overlap attacks: Teardrop, Bonk, Boink and Nestea ...... 356
6.6.5. The Land and LaTierra attacks ..................................................... 356
6.6.6. The WinNuke attack ................................................................... 356
6.6.7. Amplification attacks: Smurf, Papasmurf, Fraggle ........................... 357
6.6.8. TCP SYN Flood Attacks ............................................................. 358
6.6.9. The Jolt2 Attack ........................................................................ 358
6.6.10. Distributed DoS Attacks ............................................................358
User Manual
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