Chapter 21 ALG
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21.1.2 What You Need to Know
Application Layer Gateway (ALG), NAT and Firewall
The ZyWALL can function as an Application Layer Gateway (ALG) to allow certain
NAT un-friendly applications (such as SIP) to operate properly through the
ZyWALL’s NAT and firewall. The ZyWALL dynamically creates an implicit NAT
session and firewall session for the application’s traffic from the WAN to the LAN.
The ALG on the ZyWALL supports all of the ZyWALL’s NAT mapping types.
FTP ALG
The FTP ALG allows TCP packets with a specified port destination to pass through.
If the FTP server is located on the LAN, you must also configure NAT (port
forwarding) and firewall rules if you want to allow access to the server from the
WAN.
H.323 ALG
• The H.323 ALG supports peer-to-peer H.323 calls.
• The H.323 ALG handles H.323 calls that go through NAT or that the ZyWALL
routes. You can also make other H.323 calls that do not go through NAT or
routing. Examples would be calls between LAN IP addresses that are on the
same subnet.
• The H.323 ALG allows calls to go out through NAT. For example, you could make
a call from a private IP address on the LAN to a peer device on the WAN.
• The H.323 ALG operates on TCP packets with a specified port destination.
• The ZyWALL allows H.323 audio connections.
• The ZyWALL can also apply bandwidth management to traffic that goes through
the H.323 ALG.
The following example shows H.323 signaling (1) and audio (2) sessions between
H.323 devices A and B.
Figure 326
H.323 ALG Example
SIP ALG
• SIP phones can be in any zone (including LAN, DMZ, WAN), and the SIP server
and SIP clients can be in the same network or different networks.
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Страница 30: ...Table of Contents ZyWALL USG 300 User s Guide 30 ...
Страница 31: ...31 PART I User s Guide ...
Страница 32: ...32 ...
Страница 38: ...Chapter 1 Introducing the ZyWALL ZyWALL USG 300 User s Guide 38 ...
Страница 46: ...Chapter 2 Features and Applications ZyWALL USG 300 User s Guide 46 ...
Страница 64: ...Chapter 3 Web Configurator ZyWALL USG 300 User s Guide 64 ...
Страница 74: ...Chapter 4 Installation Setup Wizard ZyWALL USG 300 User s Guide 74 ...
Страница 116: ...Chapter 6 Configuration Basics ZyWALL USG 300 User s Guide 116 ...
Страница 128: ...Chapter 7 Tutorials ZyWALL USG 300 User s Guide 128 Figure 73 Configuration Network Interface WLAN Add ...
Страница 184: ...Chapter 7 Tutorials ZyWALL USG 300 User s Guide 184 ...
Страница 221: ...221 PART II Technical Reference ...
Страница 222: ...222 ...
Страница 288: ...Chapter 11 Registration ZyWALL USG 300 User s Guide 288 ...
Страница 303: ...Chapter 13 Interfaces ZyWALL USG 300 User s Guide 303 Figure 269 Configuration Network Interface Ethernet Edit ...
Страница 320: ...Chapter 13 Interfaces ZyWALL USG 300 User s Guide 320 Figure 275 Configuration Network Interface Cellular Add ...
Страница 330: ...Chapter 13 Interfaces ZyWALL USG 300 User s Guide 330 Figure 278 Configuration Network Interface WLAN Add No Security ...
Страница 345: ...Chapter 13 Interfaces ZyWALL USG 300 User s Guide 345 Figure 286 Configuration Network Interface VLAN Edit ...
Страница 355: ...Chapter 13 Interfaces ZyWALL USG 300 User s Guide 355 Figure 288 Configuration Network Interface Bridge Add ...
Страница 378: ...Chapter 14 Trunks ZyWALL USG 300 User s Guide 378 ...
Страница 394: ...Chapter 15 Policy and Static Routes ZyWALL USG 300 User s Guide 394 ...
Страница 408: ...Chapter 16 Routing Protocols ZyWALL USG 300 User s Guide 408 ...
Страница 428: ...Chapter 19 NAT ZyWALL USG 300 User s Guide 428 ...
Страница 454: ...Chapter 23 Authentication Policy ZyWALL USG 300 User s Guide 454 ...
Страница 472: ...Chapter 24 Firewall ZyWALL USG 300 User s Guide 472 ...
Страница 479: ...Chapter 25 IPSec VPN ZyWALL USG 300 User s Guide 479 Figure 355 Configuration VPN IPSec VPN VPN Connection Edit IKE ...
Страница 490: ...Chapter 25 IPSec VPN ZyWALL USG 300 User s Guide 490 Figure 358 Configuration VPN IPSec VPN VPN Gateway Edit ...
Страница 534: ...Chapter 27 SSL User Screens ZyWALL USG 300 User s Guide 534 ...
Страница 536: ...Chapter 28 SSL User Application Screens ZyWALL USG 300 User s Guide 536 ...
Страница 544: ...Chapter 29 SSL User File Sharing ZyWALL USG 300 User s Guide 544 ...
Страница 638: ...Chapter 35 ADP ZyWALL USG 300 User s Guide 638 Figure 448 Profiles Protocol Anomaly ...
Страница 682: ...Chapter 37 Content Filter Reports ZyWALL USG 300 User s Guide 682 ...
Страница 700: ...Chapter 38 Anti Spam ZyWALL USG 300 User s Guide 700 ...
Страница 722: ...Chapter 39 Device HA ZyWALL USG 300 User s Guide 722 ...
Страница 738: ...Chapter 40 User Group ZyWALL USG 300 User s Guide 738 ...
Страница 744: ...Chapter 41 Addresses ZyWALL USG 300 User s Guide 744 ...
Страница 756: ...Chapter 43 Schedules ZyWALL USG 300 User s Guide 756 ...
Страница 772: ...Chapter 45 Authentication Method ZyWALL USG 300 User s Guide 772 ...
Страница 794: ...Chapter 46 Certificates ZyWALL USG 300 User s Guide 794 ...
Страница 806: ...Chapter 48 SSL Application ZyWALL USG 300 User s Guide 806 ...
Страница 811: ...Chapter 49 Endpoint Security ZyWALL USG 300 User s Guide 811 ...
Страница 866: ...Chapter 50 System ZyWALL USG 300 User s Guide 866 ...
Страница 873: ...Chapter 51 Log and Report ZyWALL USG 300 User s Guide 873 ...
Страница 886: ...Chapter 51 Log and Report ZyWALL USG 300 User s Guide 886 ...
Страница 916: ...Chapter 54 Packet Flow Explore ZyWALL USG 300 User s Guide 916 ...
Страница 918: ...Chapter 55 Reboot ZyWALL USG 300 User s Guide 918 ...
Страница 920: ...Chapter 56 Shutdown ZyWALL USG 300 User s Guide 920 ...
Страница 948: ...Chapter 58 Product Specifications ZyWALL USG 300 User s Guide 948 ...
Страница 1014: ...Appendix A Log Descriptions ZyWALL USG 300 User s Guide 1014 ...
Страница 1124: ...Appendix F Open Software Announcements ZyWALL USG 300 User s Guide 1124 ...
Страница 1156: ...Index ZyWALL USG 300 User s Guide 1156 ...