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Alphabetical Index A access rules, 135 accounting, 39 interim messages, 41 limitations with NAT, 42 messages, 39 system shutdowns, 42 address book, 48 ethernet addresses in, 50 IP addresses in, 48 address groups, 51 address translation, 204 administration accounts, 23 ALG (see application layer gateway) all-nets IP object, 51 AllowBothSidesToKeepConnAlive_UDP, 316 Allow IP rule, 75 anti-virus scanning, 183 activating, 184 database, 184 memory requirements, 183 simultaneous scans, 183 application layer gateways, 138 deploying, 138 FTP, 140 H.323, 155 HTTP, 139 POP3, 151 SIP, 152 SMTP, 146 SPAM filtering, 147 TFTP, 145 ARP, 68 gratuitous, 94 proxy, 96 static, 69 ARPBroadcast setting, 313 ARPCacheSize setting, 313 ARPChanges setting, 312 ARPExpire setting, 312 ARPExpireUnknown setting, 313 ARPHashSize setting, 313 ARPHashSizeVLAN setting, 313 ARPIPCollision setting, 313 ARPMatchEnetSender setting, 312 ARPMulticast setting, 313 ARPQueryNoSenderIP setting, 312 ARPRequests setting, 312 ARPSenderIP setting, 312 authentication, 220 databases, 221 HTTP, 223 local database, 221 rules, 222 servers, 221 setup summary, 221 auto-update, 45 B bandwidth guarantees, 274 blacklisting hosts and networks, 202 IDP, 194 threshold rules, 280 URL, 170 wildcarding, 170 Block0000Src setting, 305 Block0Net setting, 305 Block127Net setting, 305 blocking applications with IDP, 188 BlockMulticastSrc setting, 305 BufFloodRebootTime setting, 336 C certification authority, 79 chains in traffic shaping, 268 CLI, 24 secure shell, 24 CLI prompt change, 25 cluster (see high availability) cluster ID (see high availability) command line interface (see CLI) config mode, 257 configurations, 29 connection limiting (see threshold rules) connection rate limiting (see threshold rules) ConnLife_IGMP setting, 316 ConnLife_Other setting, 316 ConnLife_Ping setting, 316 ConnLife_TCP_FIN setting, 316 ConnLife_TCP_SYN setting, 316 ConnLife_TCP setting, 316 ConnLife_UDP setting, 316 ConnReplace setting, 314 content filtering, 169 active content, 169 categories, 176 dynamic, 172 phishing, 180 spam, 182 static, 170 core interface, 58 core routes, 93 D date and time setting, 82 default access rule, 135 DefaultTTL setting, 305 denial of service, 198 DHCP, 127 over ethernet, 59 relaying, 131 servers, 128 static assignment, 130 DHCP_AllowGlobalBcast setting, 325 DHCP_DisableArpOnOffer setting, 325 DHCP_MinimumLeaseTime setting, 325 351

Section	Page
User Manual	3
Table of Contents	4
Preface	12
Chapter 1. Product Overview	14
1.1. About D-Link NetDefendOS	14
1.2. NetDefendOS Architecture	16
1.2.1. State-based Architecture	16
1.2.2. NetDefendOS Building Blocks	16
1.2.3. Basic Packet Flow	17
1.3. NetDefendOS State Engine Packet Flow	19
Chapter 2. Management and Maintenance	23
2.1. Managing NetDefendOS	23
2.1.1. Overview	23
2.1.2. Default Administrator Accounts	23
2.1.3. The CLI	24
2.1.4. The WebUI	26
2.1.5. Working with Configurations	29
2.2. Events and Logging	35
2.2.1. Overview	35
2.2.2. Event Messages	35
2.2.3. Event Message Distribution	35
2.2.3.1. Logging to Syslog Hosts	36
2.2.3.2. SNMP Traps	37
2.3. RADIUS Accounting	39
2.3.1. Overview	39
2.3.2. RADIUS Accounting Messages	39
2.3.3. Interim Accounting Messages	41
2.3.4. Activating RADIUS Accounting	41
2.3.5. RADIUS Accounting Security	41
2.3.6. RADIUS Accounting and High Availability	41
2.3.7. Handling Unresponsive Servers	42
2.3.8. Accounting and System Shutdowns	42
2.3.9. Limitations with NAT	42
2.4. Monitoring	43
2.4.1. SNMP Monitoring	43
2.5. Maintenance	45
2.5.1. Auto-Update Mechanism	45
2.5.2. Configuration Backup and Restore	45
2.5.3. Resetting to Factory Defaults	45
Chapter 3. Fundamentals	48
3.1. The Address Book	48
3.1.1. Overview	48
3.1.2. IP Addresses	48
3.1.3. Ethernet Addresses	50
3.1.4. Address Groups	51
3.1.5. Auto-Generated Address Objects	51
3.2. Services	52
3.2.1. Overview	52
3.2.2. TCP and UDP Based Services	53
3.2.3. ICMP Services	55
3.2.4. Custom IP Protocol Services	55
3.3. Interfaces	57
3.3.1. Overview	57
3.3.2. Ethernet	58
3.3.3. VLAN	60
3.3.4. PPPoE	61
3.3.4.1. Overview of PPP	61
3.3.4.2. PPPoE Client Configuration	62
3.3.5. GRE Tunnels	63
3.3.6. Interface Groups	66
3.4. ARP	68
3.4.1. Overview	68
3.4.2. ARP in NetDefendOS	68
3.4.3. ARP Cache	68
3.4.4. Static and Published ARP Entries	69
3.4.5. Advanced ARP Settings	71
3.5. The IP Rule Set	73
3.5.1. Security Policies	73
3.5.2. IP Rule Evaluation	74
3.5.3. IP Rule Actions	75
3.5.4. Editing IP rule set Entries	76
3.6. Schedules	77
3.7. X.509 Certificates	79
3.7.1. Overview	79
3.7.2. X.509 Certificates in NetDefendOS	80
3.8. Setting Date and Time	82
3.8.1. General Date and Time Settings	82
3.8.2. Time Servers	83
3.9. DNS Lookup	87
Chapter 4. Routing	89
4.1. Overview	89
4.2. Static Routing	90
4.2.1. Basic Principles of Routing	90
4.2.2. Static Routing	91
4.2.3. Route Failover	94
4.2.4. Proxy ARP	96
4.3. Policy-based Routing	98
4.3.1. Overview	98
4.3.2. Policy-based Routing Tables	98
4.3.3. Policy-based Routing Rules	98
4.3.4. Policy-based Routing Table Selection	99
4.3.5. The Ordering parameter	99
4.4. Dynamic Routing	103
4.4.1. Dynamic Routing overview	103
4.4.2. OSPF	104
4.4.3. Dynamic Routing Policy	107
4.5. Multicast Routing	110
4.5.1. Overview	110
4.5.2. Multicast Forwarding using the SAT Multiplex Rule	110
4.5.2.1. Multicast Forwarding - No Address Translation	111
4.5.2.2. Multicast Forwarding - Address Translation Scenario	112
4.5.3. IGMP Configuration	114
4.5.3.1. IGMP Rules Configuration - No Address Translation	115
4.5.3.2. IGMP Rules Configuration - Address Translation	116
4.6. Transparent Mode	119
4.6.1. Overview of Transparent Mode	119
4.6.2. Comparison with Routing mode	119
4.6.3. Transparent Mode Implementation	119
4.6.4. Enabling Transparent Mode	120
4.6.5. High Availability with Transparent Mode	120
4.6.6. Transparent Mode Scenarios	120
Chapter 5. DHCP Services	127
5.1. Overview	127
5.2. DHCP Servers	128
5.3. Static DHCP Assignment	130
5.4. DHCP Relaying	131
5.5. IP Pools	132
Chapter 6. Security Mechanisms	135
6.1. Access Rules	135
6.1.1. Introduction	135
6.1.2. IP spoofing	135
6.1.3. Access Rule Settings	136
6.2. Application Layer Gateways	138
6.2.1. Overview	138
6.2.2. HTTP	139
6.2.3. FTP	140
6.2.4. TFTP	145
6.2.5. SMTP	146
6.2.5.1. DNSBL SPAM Filtering	147
6.2.6. POP3	151
6.2.7. SIP	152
6.2.8. H.323	155
6.3. Web Content Filtering	169
6.3.1. Overview	169
6.3.2. Active Content Handling	169
6.3.3. Static Content Filtering	170
6.3.4. Dynamic Web Content Filtering	172
6.3.4.1. Content Filtering Categories	176
6.4. Anti-Virus Scanning	183
6.4.1. Overview	183
6.4.2. Implementation	183
6.4.3. Activating Anti-Virus Scanning	184
6.4.4. The Signature Database	184
6.4.5. Subscribing to the D-Link Anti-Virus Service	184
6.4.6. Anti-Virus Options	184
6.5. Intrusion Detection and Prevention	188
6.5.1. Overview	188
6.5.2. IDP Availability in D-Link Models	188
6.5.3. IDP Rules	190
6.5.4. Insertion/Evasion Attack Prevention	191
6.5.5. IDP Pattern Matching	192
6.5.6. IDP Signature Groups	192
6.5.7. IDP Actions	194
6.5.8. SMTP Log Receiver for IDP Events	194
6.6. Denial-Of-Service (DoS) Attacks	198
6.6.1. Overview	198
6.6.2. DoS Attack Mechanisms	198
6.6.3. Ping of Death and Jolt Attacks	198
6.6.4. Fragmentation overlap attacks: Teardrop, Bonk, Boink and Nestea	199
6.6.5. The Land and LaTierra attacks	199
6.6.6. The WinNuke attack	199
6.6.7. Amplification attacks: Smurf, Papasmurf, Fraggle	200
6.6.8. TCP SYN Flood Attacks	201
6.6.9. The Jolt2 Attack	201
6.6.10. Distributed DoS Attacks	201
6.7. Blacklisting Hosts and Networks	202
Chapter 7. Address Translation	204
7.1. Dynamic Network Address Translation	204
7.2. NAT Pools	207
7.3. Static Address Translation	210
7.3.1. Translation of a Single IP Address (1:1)	210
7.3.2. Translation of Multiple IP Addresses (M:N)	213
7.3.3. All-to-One Mappings (N:1)	215
7.3.4. Port Translation	216
7.3.5. Protocols handled by SAT	216
7.3.6. Multiple SAT rule matches	217
7.3.7. SAT and FwdFast Rules	217
Chapter 8. User Authentication	220
8.1. Overview	220
8.2. Authentication Setup	221
8.2.1. Setup Summary	221
8.2.2. The Local Database	221
8.2.3. External Authentication Servers	221
8.2.4. Authentication Rules	222
8.2.5. Authentication Processing	223
8.2.6. HTTP Authentication	223
Chapter 9. VPN	229
9.1. Overview	229
9.1.1. The Need for VPNs	229
9.1.2. VPN Encryption	229
9.1.3. VPN Planning	229
9.1.4. Key Distribution	230
9.2. VPN Quickstart Guide	231
9.2.1. IPsec LAN to LAN with Pre-shared Keys	231
9.2.2. IPsec Roaming Clients with Pre-shared Keys	232
9.2.3. IPsec Roaming Clients with Certificates	234
9.2.4. L2TP Roaming Clients with Pre-Shared Keys	234
9.2.5. L2TP Roaming Clients with Certificates	236
9.2.6. PPTP Roaming Clients	236
9.2.7. VPN Troubleshooting	237
9.3. IPsec	240
9.3.1. Overview	240
9.3.2. Internet Key Exchange (IKE)	240
9.3.3. IKE Authentication	245
9.3.4. IPsec Protocols (ESP/AH)	247
9.3.5. NAT Traversal	248
9.3.6. Proposal Lists	249
9.3.7. Pre-shared Keys	250
9.3.8. Identification Lists	251
9.4. IPsec Tunnels	253
9.4.1. Overview	253
9.4.2. LAN to LAN Tunnels with Pre-shared Keys	253
9.4.3. Roaming Clients	253
9.4.3.1. PSK based client tunnels	254
9.4.3.2. Self-signed Certificate based client tunnels	255
9.4.3.3. CA Server issued Certificates based client tunnels	256
9.4.3.4. Using Config Mode	257
9.4.4. Fetching CRLs from an alternate LDAP server	259
9.5. PPTP/L2TP	260
9.5.1. PPTP	260
9.5.2. L2TP	261
Chapter 10. Traffic Management	267
10.1. Traffic Shaping	267
10.1.1. Introduction	267
10.1.2. Traffic Shaping in NetDefendOS	268
10.1.3. Simple Bandwidth Limiting	269
10.1.4. Limiting Bandwidth in Both Directions	270
10.1.5. Creating Differentiated Limits with Chains	271
10.1.6. Precedences	272
10.1.7. Guarantees	274
10.1.8. Differentiated Guarantees	274
10.1.9. Groups	275
10.1.10. Recommendations	276
10.1.11. A Summary of Traffic Shaping	277
10.2. Threshold Rules	279
10.2.1. Overview	279
10.2.2. Connection Rate/Total Connection Limiting	279
10.2.3. Grouping	279
10.2.4. Rule Actions	279
10.2.5. Multiple Triggered Actions	280
10.2.6. Exempted Connections	280
10.2.7. Threshold Rules and ZoneDefense	280
10.2.8. Threshold Rule Blacklisting	280
10.3. Server Load Balancing	281
10.3.1. Overview	281
10.3.2. Identifying the Servers	282
10.3.3. The Load Distribution Mode	282
10.3.4. The Distribution Algorithm	282
10.3.5. Server Health Monitoring	284
10.3.6. SLB_SAT Rules	284
Chapter 11. High Availability	289
11.1. Overview	289
11.2. High Availability Mechanisms	291
11.3. High Availability Setup	293
11.3.1. Hardware Setup	293
11.3.2. NetDefendOS Setup	294
11.3.3. Verifying Cluster Functioning	294
11.4. High Availability Issues	296
Chapter 12. ZoneDefense	298
12.1. Overview	298
12.2. ZoneDefense Switches	299
12.3. ZoneDefense Operation	300
12.3.1. SNMP	300
12.3.2. Threshold Rules	300
12.3.3. Manual Blocking and Exclude Lists	300
12.3.4. Limitations	302
Chapter 13. Advanced Settings	304
13.1. IP Level Settings	304
13.2. TCP Level Settings	307
13.3. ICMP Level Settings	311
13.4. ARP Settings	312
13.5. Stateful Inspection Settings	314
13.6. Connection Timeouts	316
13.7. Size Limits by Protocol	318
13.8. Fragmentation Settings	320
13.9. Local Fragment Reassembly Settings	324
13.10. DHCP Settings	325
13.11. DHCPRelay Settings	326
13.12. DHCPServer Settings	327
13.13. IPsec Settings	328
13.14. Logging Settings	330
13.15. Time Synchronization Settings	331
13.16. PPP Settings	333
13.17. Hardware Monitor Settings	334
13.18. Packet Re-assembly Settings	335
13.19. Miscellaneous Settings	336
Appendix A. Subscribing to Security Updates	338
Appendix B. IDP Signature Groups	340
Appendix C. Checked MIME filetypes	344
Appendix D. The OSI Framework	348
Appendix E. D-Link worldwide offices	349

Match case Limit results 1 per page

Alphabetical Index

access rules, 135

accounting, 39

interim messages, 41

limitations with NAT, 42

messages, 39

system shutdowns, 42

address book, 48

ethernet addresses in, 50

IP addresses in, 48

address groups, 51

address translation, 204

administration accounts, 23

ALG (see application layer gateway)

all-nets IP object, 51

AllowBothSidesToKeepConnAlive_UDP, 316

Allow IP rule, 75

anti-virus scanning, 183

activating, 184

database, 184

memory requirements, 183

simultaneous scans, 183

application layer gateways, 138

deploying, 138

FTP, 140

H.323, 155

HTTP, 139

POP3, 151

SIP, 152

SMTP, 146

SPAM filtering, 147

TFTP, 145

ARP, 68

gratuitous, 94

proxy, 96

static, 69

ARPBroadcast setting, 313

ARPCacheSize setting, 313

ARPChanges setting, 312

ARPExpire setting, 312

ARPExpireUnknown setting, 313

ARPHashSize setting, 313

ARPHashSizeVLAN setting, 313

ARPIPCollision setting, 313

ARPMatchEnetSender setting, 312

ARPMulticast setting, 313

ARPQueryNoSenderIP setting, 312

ARPRequests setting, 312

ARPSenderIP setting, 312

authentication, 220

databases, 221

HTTP, 223

local database, 221

rules, 222

servers, 221

setup summary, 221

auto-update, 45

bandwidth guarantees, 274

blacklisting

hosts and networks, 202

IDP, 194

threshold rules, 280

URL, 170

wildcarding, 170

Block0000Src setting, 305

Block0Net setting, 305

Block127Net setting, 305

blocking applications with IDP, 188

BlockMulticastSrc setting, 305

BufFloodRebootTime setting, 336

certification authority, 79

chains

in traffic shaping, 268

CLI, 24

secure shell, 24

CLI prompt change, 25

cluster (see high availability)

cluster ID (see high availability)

command line interface (see CLI)

config mode, 257

configurations, 29

connection limiting (see threshold rules)

connection rate limiting (see threshold rules)

ConnLife_IGMP setting, 316

ConnLife_Other setting, 316

ConnLife_Ping setting, 316

ConnLife_TCP_FIN setting, 316

ConnLife_TCP_SYN setting, 316

ConnLife_TCP setting, 316

ConnLife_UDP setting, 316

ConnReplace setting, 314

content filtering, 169

active content, 169

categories, 176

dynamic, 172

phishing, 180

spam, 182

static, 170

core interface, 58

core routes, 93

date and time setting, 82

default access rule, 135

DefaultTTL setting, 305

denial of service, 198

DHCP, 127

over ethernet, 59

relaying, 131

servers, 128

static assignment, 130

DHCP_AllowGlobalBcast setting, 325

DHCP_DisableArpOnOffer setting, 325

DHCP_MinimumLeaseTime setting, 325

351