Lancom-systems LCOS 3.50 Manuel d'utilisateur Page 117
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Noté. / 5. Basé sur avis des utilisateurs
Chapter 8: Firewall LANCOM Reference Manual LCOS 3.50
117
Firewall
The LANCOM Firewall uses several lists for checking data packets, which are
automatically generated from Firewall rules, resulting Firewall actions or by
active data connections:
Host block list
Port block list
Connection list
Filter list
When a data packet should be routed via the IP router, the Firewall uses the
lists as follows:
햲 The first check is, whether the packet was coming from a workstation
belonging to the host block list. If the sender is blocked, the packet will
be discarded.
햳 If the sender is not blocked in this list, the port block list will be checked,
if the used port/protocol combination on the destination PC is closed. In
this case the packet will be discarded.
햴 If sender and destination are not blocked in the first two lists, then it will
be checked whether a connection entry exists for this packet in the con-
nection list. If such an entry exists, then the packet will be handled as
noted in this list.
햵 If no entry has been found for the packet, then the filter list will be
searched, whether a suitable entry exists and the action indicated in this
- 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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