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LANCOM Reference Manual LCOS 3.50 Chapter 14: Virtual Private Networks—VPN
310
Virtual Private Networks—
VPN
Definition of the tunnel endpoints
Definition of the security-related parameters (IKE and IPSec)
Definition of the VPN network relationships, i.e. the IP address ranges to
be connected. Should the IP ranges overlap at both ends of the
connection, please refer to the section ’N:N mapping’ auf Seite 80.
When coupling Windows networks (NetBIOS/IP): Without WINS servers at
both ends of the VPN connection (such as when linking a home office),
the LANCOM can take over the necessary NetBIOS proxy functions. To this
end, the NetBIOS module in the LANCOM must be activated, and the
corresponding VPN remote site must be entered into the NetBIOS module
as the remote site. Should WINS servers be present in both of the coupled
networks, then the NetBIOS module should be deactivated so that the
LANCOM does not perform NetBIOS proxy functions.
When using LANCOM Dynamic VPN: Entry for the corresponding remote
site in the PPP list with a suitable password for the Dynamic VPN
handshake. The username entered here must correspond with the name
entered in the remote device that describes the VPN connection to this
local device. Activate "IP routing". If Windows networks are also to be
coupled, then the NetBIOS entry should be activated here.
The tunnel endpoints, i.e. the local VPN gateway and each of the VPN remote
stations, are entered into the VPN connection list.
Manually configuring the VPN connection involves the following steps:
햲 Create an entry for the remote VPN gateway in the connection list and
enter its public IP address.
햳 The security parameters for the VPN connection are normally taken from
the prepared list, and all that is required here is to define an IKE key.
햴 For a Dynamic VPN connection, create a new entry in the PPP list with the
name of the remote VPN gateway as the remote station, with the name of
the local VPN gateway as the User Name, and set a suitable password. Be
sure to activate the IP routing for this PPP connection and, if required, the
routing of “NetBIOS over IP” as well. The remaining PPP parameters, such
as the procedure for checking the remote station, can be defined in the
same way as for other PPP connections.
햵 The main task in setting up VPN connections is in defining the network
relationships. Which IP address ranges at each end of the VPN tunnel
should be included in the secured connection?
- Reference Manual 1
- LANCOM LCOS 3.50 1
- Contents 3
- 1Preface 10
- 2 System design 13
- System design 14
- Configuration and manage 15
- 3.2 Configuration software 16
- LANCAPI 21
- 3.5.1 How to start a trace 26
- 3.5.2 Overview of the keys 27
- 3.5.4 Combination commands 28
- 3.5.5 Examples 29
- 3.8 Command line interface 32
- 3.8.1 Command line reference 33
- 3.9 Scheduled Events 34
- 4 Management 37
- 4.1.1 Application examples 38
- Management 39
- 4.1.2 Configuration 42
- 5 Diagnosis 46
- Diagnosis 47
- 5.2.1 How to start a trace 48
- 5.2.2 Overview of the keys 49
- 5.2.4 Combination commands 50
- 5.2.5 Examples 51
- 6 Security 52
- Security 53
- 6.1.2 Login barring 54
- 6.2.1 Identification control 58
- 6.2.2 Callback 60
- 6.3 The security checklist 61
- 7 Routing and WAN connections 64
- 7.2 IP routing 66
- 7.2.2 Local routing 68
- Configuration tool Menu/table 72
- 7.2.4 SYN/ACK speedup 73
- 7.3.1 Simple masquerading 74
- Source IP Port 75
- 7.3.2 Inverse masquerading 78
- 7.4 N:N mapping 80
- 7.4.1 Application examples 81
- 7.4.2 Configuration 85
- 7.5.1 Name list 89
- 7.5.2 Layer list 90
- Parameter Meaning 91
- 7.6.1 The protocol 92
- In this column of 97
- 7.8 Callback functions 98
- Routing and WAN 100
- With this 100
- 8Firewall 104
- 8.1.3 The methods 105
- 8.1.4 The victims 106
- 8.2 What is a Firewall? 107
- Firewall 108
- 8.3 The LANCOM Firewall 114
- 8.3.2 Special protocols 119
- Configuration tool Run 132
- Firewall wizard 141
- Condition Description Object 148
- Limit Description Object 148
- Measure Description Object 150
- 8.3.9 Firewall diagnosis 151
- Configuration tool 152
- Element Element meaning 153
- Entry Description 155
- Flag Flag meaning 158
- 8.3.10 Firewall limitations 159
- Detection 160
- 9 Quality of Service 168
- Quality of Service 169
- 9.3 The queue concept 172
- Packet size in bytes 180
- 1 64 128 256 512 1024 1500 180
- 9.7 QoS configuration 183
- Transfer External 188
- 10 Virtual LANs (VLANs) 192
- 10.2.1 Frame tagging 193
- Virtual LANs (VLANs) 194
- 10.2.3 Application examples 195
- 10.3 Configuration of VLANs 198
- 10.3.2 The port table 199
- 11 Wireless LAN – WLAN 203
- Wireless LAN – WLAN 204
- 11.2.1 Some basic concepts 214
- 11.2.2 WEP 215
- 11.2.3 WEPplus 219
- 11.2.4 EAP and 802.1x 220
- 11.2.5 TKIP and WPA 223
- 11.2.6 AES and 802.11i 230
- 11.2.7 Summary 231
- 11.4.1 WLAN security 234
- Configuration tool Menu/Table 235
- 11.4.2 General WLAN settings 243
- √ (λ * d) 257
- 11.5.2 Antenna power 258
- Maximum distance [km] 262
- Mbps P2P P2mP 262
- Assumed cable loss: 9 dB 263
- Antenna gain: 8.5 dBi 263
- Assumed cable loss: 6 dB 263
- Office communications with 265
- 12.3 How to use the LANCAPI 270
- 12.4 The LANCOM CAPI Faxmodem 270
- 13.1.1 The DHCP server 272
- Server services for the LAN 273
- 13.2 DNS 277
- 13.2.2 DNS forwarding 279
- Configuration tool Run/Table 280
- 13.2.4 URL blocking 283
- 13.2.5 Dynamic DNS 284
- 13.3 Call charge management 285
- 13.4 The SYSLOG module 287
- Source Meaning Facility 289
- /etc/syslog.conf 290
- /var/log/lancom.log 290
- 14.1 What does VPN offer? 291
- Virtual Private Networks— 292
- 14.2 LANCOM VPN: an overview 295
- 14.2.3 LANCOM VPN functions 297
- 14.3.1 LAN-LAN coupling 298
- 14.5.3 Inspect VPN rules 309
- 14.6.1 Static/static 323
- 14.6.2 Dynamic/static 323
- Branch_office 324
- 14.7 How does VPN work? 326
- 14.7.2 Alternatives to IPSec 328
- 14.8.5 Key management – IKE 335
- 16 Index 338
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