ZyWALL (ZLD) CLI Reference Guide
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Firewall
This chapter introduces the ZyWALL’s firewall and shows you how to configure your
ZyWALL’s firewall.
15.1 Firewall Overview
The ZyWALL’s firewall is a stateful inspection firewall. The ZyWALL restricts access by
screening data packets against defined access rules. It can also inspect sessions. For example,
traffic from one zone is not allowed unless it is initiated by a computer in another zone first.
A zone is a group of interfaces or VPN tunnels. Group the ZyWALL’s interfaces into different
zones based on your needs. You can configure firewall rules for data passing between zones or
even between interfaces and/or VPN tunnels in a zone.
The following figure shows the ZyWALL’s default firewall rules in action as well as
demonstrates how stateful inspection works. User
1
can initiate a Telnet session from within
the LAN zone and responses to this request are allowed. However, other Telnet traffic initiated
from the WAN or DMZ zone and destined for the LAN zone is blocked. Communications
between the WAN and the DMZ zones are allowed. The firewall allows VPN traffic between
any of the networks.
Figure 18
Default Firewall Action
Содержание ZyWall
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Страница 110: ...Chapter 11 DDNS ZyWALL ZLD CLI Reference Guide 110 ...
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Страница 120: ...Chapter 13 HTTP Redirect ZyWALL ZLD CLI Reference Guide 120 ...
Страница 124: ...Chapter 14 ALG ZyWALL ZLD CLI Reference Guide 124 ...
Страница 125: ...125 PART III Firewall Firewall 127 ...
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Страница 134: ...Chapter 15 Firewall ZyWALL ZLD CLI Reference Guide 134 ...
Страница 135: ...135 PART IV VPN IPSec VPN 137 SSL VPN 147 L2TP VPN 153 ...
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Страница 146: ...Chapter 16 IPSec VPN ZyWALL ZLD CLI Reference Guide 146 ...
Страница 152: ...Chapter 17 SSL VPN ZyWALL ZLD CLI Reference Guide 152 ...
Страница 160: ...Chapter 18 L2TP VPN ZyWALL ZLD CLI Reference Guide 160 ...
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Страница 174: ...Chapter 19 Application Patrol ZyWALL ZLD CLI Reference Guide 174 ...
Страница 175: ...175 PART VI Anti X Anti Virus 177 IDP Commands 185 Content Filtering 203 Anti Spam 215 ...
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Страница 202: ...Chapter 21 IDP Commands ZyWALL ZLD CLI Reference Guide 202 ...
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Страница 224: ...Chapter 23 Anti Spam ZyWALL ZLD CLI Reference Guide 224 ...
Страница 225: ...225 PART VII Device HA Device HA 227 ...
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Страница 248: ...Chapter 26 Addresses ZyWALL ZLD CLI Reference Guide 248 ...
Страница 252: ...Chapter 27 Services ZyWALL ZLD CLI Reference Guide 252 ...
Страница 262: ...Chapter 29 AAA Server ZyWALL ZLD CLI Reference Guide 262 ...
Страница 266: ...Chapter 30 Authentication Objects ZyWALL ZLD CLI Reference Guide 266 ...
Страница 272: ...Chapter 31 Certificates ZyWALL ZLD CLI Reference Guide 272 ...
Страница 276: ...Chapter 32 ISP Accounts ZyWALL ZLD CLI Reference Guide 276 ...
Страница 280: ...Chapter 33 SSL Application ZyWALL ZLD CLI Reference Guide 280 ...
Страница 288: ...Chapter 34 Endpoint Security ZyWALL ZLD CLI Reference Guide 288 ...
Страница 289: ...289 PART IX System System 291 System Remote Management 299 ...
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Страница 298: ...Chapter 35 System ZyWALL ZLD CLI Reference Guide 298 ...
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Страница 332: ...Chapter 37 File Manager ZyWALL ZLD CLI Reference Guide 332 Figure 55 Startup Complete ...
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Страница 346: ...Chapter 40 Session Timeout ZyWALL ZLD CLI Reference Guide 346 ...
Страница 348: ...Chapter 41 Diagnostics ZyWALL ZLD CLI Reference Guide 348 ...
Страница 362: ...Chapter 44 Watchdog Timer ZyWALL ZLD CLI Reference Guide 362 ...
Страница 363: ...363 PART XI Command List List of Commands Alphabetical 365 ...
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