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Chapter 8 The NAT Configuration Screens
OX253P User
’
s Guide
85
8.5 ALG
Some applications, such as SIP, cannot operate through NAT (are NAT un-friendly)
because they embed IP addresses and port numbers in their packets
’
data
payload.
Some NAT routers may include a SIP Application Layer Gateway (ALG). An
Application Layer Gateway (ALG) manages a specific protocol (such as SIP, H.323
or FTP) at the application layer.
A SIP ALG allows SIP calls to pass through NAT by examining and translating IP
addresses embedded in the data stream.
Click
ADVANCED > NAT Configuration > ALG
to enable and disable SIP (VoIP),
FTP (file transfer), and H.323 (audio-visual) ALG in the OX253P.
Figure 32
ADVANCED > NAT Configuration > ALG
The following table describes the labels in this screen.
Table 29
ADVANCED > NAT Configuration > ALG
LABEL
DESCRIPTION
Enable SIP ALG
Select this to make sure SIP (VoIP) works correctly with port-
forwarding and port-triggering rules.
Enable FTP ALG Select this to make sure FTP (file transfer) works correctly with port-
forwarding and port-triggering rules.
Enable H.323
ALG
Select this to make sure H.323 (audio-visual programs, such as
NetMeeting) works correctly with port-forwarding and port-triggering
rules.
Apply
Click to save your changes.
Cancel
Click to return to the previous screen without saving your changes.
Summary of Contents for OX253P
Page 9: ...Contents Overview OX253P User s Guide 10 ...
Page 16: ...17 PART I User s Guide ...
Page 17: ...18 ...
Page 21: ...Chapter 1 Getting Started OX253P User s Guide 22 ...
Page 27: ...Chapter 2 Introducing the Web Configurator OX253P User s Guide 28 ...
Page 44: ...45 PART II Technical Reference ...
Page 45: ...46 ...
Page 85: ...Chapter 8 The NAT Configuration Screens OX253P User s Guide 86 ...
Page 117: ...Chapter 10 The Certificates Screens OX253P User s Guide 118 ...
Page 127: ...Chapter 11 The Firewall Screens OX253P User s Guide 128 ...
Page 171: ...Chapter 16 The Status Screen OX253P User s Guide 172 ...
Page 179: ...Chapter 17 Troubleshooting OX253P User s Guide 180 ...
Page 183: ...Chapter 18 Product Specifications OX253P User s Guide 184 ...
Page 215: ...Appendix B Setting Up Your Computer s IP Address OX253P User s Guide 216 ...
Page 227: ...Appendix C Pop up Windows JavaScripts and Java Permissions OX253P User s Guide 228 ...
Page 278: ...Index OX253P User s Guide 279 ...
Page 279: ...Index OX253P User s Guide 280 ...