Lancom Systems LCOS 3.50 - Manual (Page 8)

LANCOM Reference Manual LCOS 3.50 ̈ Contents
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Contents
13 Server services for the LAN 272
13.1 Automatic IP address administration with DHCP 272
13.1.1 The DHCP server 272
13.1.2 DHCP—'on', 'off' or 'auto'? 273
13.1.3 How are the addresses assigned? 274
13.2 DNS 277
13.2.1 What does a DNS server do? 277
13.2.2 DNS forwarding 279
13.2.3 Setting up the DNS server 280
13.2.4 URL blocking 283
13.2.5 Dynamic DNS 284
13.3 Call charge management 285
13.3.1 Charge-based ISDN connection limits 285
13.3.2 Time dependent ISDN connection limit 286
13.3.3 Settings in the charge module 287
13.4 The SYSLOG module 287
13.4.1 Setting up the SYSLOG module 288
13.4.2 Example configuration with LANconfig 288
14 Virtual Private Networks—VPN 291
14.1 What does VPN offer? 291
14.1.1 Private IP addresses on the Internet? 293
14.1.2 Secure communications via the Internet? 294
14.2 LANCOM VPN: an overview 295
14.2.1 VPN example application 295
14.2.2 Advantages of LANCOM VPN 296
14.2.3 LANCOM VPN functions 297
14.3 VPN connections in detail 298
14.3.1 LAN-LAN coupling 298
14.3.2 Dial-in connections (Remote Access Service) 299
14.4 What is LANCOM Dynamic VPN? 300
14.4.1 A look at IP addressing 300
14.4.2 This is how LANCOM Dynamic VPN works 301
14.5 Configuration of VPN connections 306
14.5.1 VPN tunnel: Connections between VPN gateways 307
14.5.2 Set up VPN connections with the Setup Wizard
308
14.5.3 Inspect VPN rules 309
14.5.4 Manually setting up VPN connections 309