Chapter 21 ALG
ZyWALL USG 100/200 Series User’s Guide
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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 327
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.
Содержание ZyWALL USG 100 Series
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Страница 30: ...Table of Contents ZyWALL USG 100 200 Series User s Guide 30 ...
Страница 31: ...31 PART I User s Guide ...
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Страница 46: ...Chapter 2 Features and Applications ZyWALL USG 100 200 Series User s Guide 46 ...
Страница 64: ...Chapter 3 Web Configurator ZyWALL USG 100 200 Series User s Guide 64 ...
Страница 130: ...Chapter 7 Tutorials ZyWALL USG 100 200 Series User s Guide 130 Figure 74 Configuration Network Interface WLAN Add ...
Страница 186: ...Chapter 7 Tutorials ZyWALL USG 100 200 Series User s Guide 186 ...
Страница 223: ...Chapter 8 L2TP VPN Example ZyWALL USG 100 200 Series User s Guide 223 ...
Страница 224: ...Chapter 8 L2TP VPN Example ZyWALL USG 100 200 Series User s Guide 224 ...
Страница 225: ...225 PART II Technical Reference ...
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Страница 240: ...Chapter 9 Dashboard ZyWALL USG 100 200 Series User s Guide 240 ...
Страница 284: ...Chapter 10 Monitor ZyWALL USG 100 200 Series User s Guide 284 ...
Страница 348: ...Chapter 13 Interfaces ZyWALL USG 100 200 Series User s Guide 348 Figure 287 Configuration Network Interface VLAN Edit ...
Страница 358: ...Chapter 13 Interfaces ZyWALL USG 100 200 Series User s Guide 358 Figure 289 Configuration Network Interface Bridge Add ...
Страница 372: ...Chapter 13 Interfaces ZyWALL USG 100 200 Series User s Guide 372 ...
Страница 382: ...Chapter 14 Trunks ZyWALL USG 100 200 Series User s Guide 382 ...
Страница 398: ...Chapter 15 Policy and Static Routes ZyWALL USG 100 200 Series User s Guide 398 ...
Страница 412: ...Chapter 16 Routing Protocols ZyWALL USG 100 200 Series User s Guide 412 ...
Страница 432: ...Chapter 19 NAT ZyWALL USG 100 200 Series User s Guide 432 ...
Страница 437: ...Chapter 20 HTTP Redirect ZyWALL USG 100 200 Series User s Guide 437 ...
Страница 438: ...Chapter 20 HTTP Redirect ZyWALL USG 100 200 Series User s Guide 438 ...
Страница 460: ...Chapter 23 Authentication Policy ZyWALL USG 100 200 Series User s Guide 460 ...
Страница 478: ...Chapter 24 Firewall ZyWALL USG 100 200 Series User s Guide 478 ...
Страница 496: ...Chapter 25 IPSec VPN ZyWALL USG 100 200 Series User s Guide 496 Figure 359 Configuration VPN IPSec VPN VPN Gateway Edit ...
Страница 519: ...Chapter 25 IPSec VPN ZyWALL USG 100 200 Series User s Guide 519 ...
Страница 520: ...Chapter 25 IPSec VPN ZyWALL USG 100 200 Series User s Guide 520 ...
Страница 527: ...Chapter 26 SSL VPN ZyWALL USG 100 200 Series User s Guide 527 Figure 373 VPN SSL VPN Access Privilege Add Edit ...
Страница 534: ...Chapter 26 SSL VPN ZyWALL USG 100 200 Series User s Guide 534 ...
Страница 544: ...Chapter 27 SSL User Screens ZyWALL USG 100 200 Series User s Guide 544 ...
Страница 546: ...Chapter 28 SSL User Application Screens ZyWALL USG 100 200 Series User s Guide 546 ...
Страница 554: ...Chapter 29 SSL User File Sharing ZyWALL USG 100 200 Series User s Guide 554 ...
Страница 639: ...Chapter 34 IDP ZyWALL USG 100 200 Series User s Guide 639 ...
Страница 640: ...Chapter 34 IDP ZyWALL USG 100 200 Series User s Guide 640 ...
Страница 650: ...Chapter 35 ADP ZyWALL USG 100 200 Series User s Guide 650 Figure 449 Profiles Protocol Anomaly ...
Страница 661: ...Chapter 35 ADP ZyWALL USG 100 200 Series User s Guide 661 ...
Страница 662: ...Chapter 35 ADP ZyWALL USG 100 200 Series User s Guide 662 ...
Страница 694: ...Chapter 37 Content Filter Reports ZyWALL USG 100 200 Series User s Guide 694 ...
Страница 712: ...Chapter 38 Anti Spam ZyWALL USG 100 200 Series User s Guide 712 ...
Страница 734: ...Chapter 39 Device HA ZyWALL USG 100 200 Series User s Guide 734 ...
Страница 750: ...Chapter 40 User Group ZyWALL USG 100 200 Series User s Guide 750 ...
Страница 756: ...Chapter 41 Addresses ZyWALL USG 100 200 Series User s Guide 756 ...
Страница 768: ...Chapter 43 Schedules ZyWALL USG 100 200 Series User s Guide 768 ...
Страница 784: ...Chapter 45 Authentication Method ZyWALL USG 100 200 Series User s Guide 784 ...
Страница 806: ...Chapter 46 Certificates ZyWALL USG 100 200 Series User s Guide 806 ...
Страница 818: ...Chapter 48 SSL Application ZyWALL USG 100 200 Series User s Guide 818 ...
Страница 828: ...Chapter 49 Endpoint Security ZyWALL USG 100 200 Series User s Guide 828 ...
Страница 880: ...Chapter 50 System ZyWALL USG 100 200 Series User s Guide 880 ...
Страница 920: ...Chapter 54 Reboot ZyWALL USG 100 200 Series User s Guide 920 ...
Страница 922: ...Chapter 55 Shutdown ZyWALL USG 100 200 Series User s Guide 922 ...
Страница 942: ...Chapter 56 Troubleshooting ZyWALL USG 100 200 Series User s Guide 942 ...
Страница 954: ...Chapter 57 Product Specifications ZyWALL USG 100 200 Series User s Guide 954 ...
Страница 1126: ...Appendix F Open Software Announcements ZyWALL USG 100 200 Series User s Guide 1126 ...