Chapter 11 Network Address Translation (NAT)
Use this screen to enable and disable the SIP (VoIP) ALG in the
Figure 74 Network Setting > NAT > ALG
The following table describes the fields in this screen.
Table 55 Network Setting > NAT > ALG
LABEL | DESCRIPTION |
ALG | Enable the SIP ALG to make sure SIP (VoIP) works correctly with |
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Apply | Click Apply to save your changes. |
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Cancel | Click Cancel to restore your previously saved settings. |
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11.6 NAT Technical Reference
This chapter contains more information regarding NAT.
11.6.1 NAT Definitions
Inside/outside denotes where a host is located relative to the
Global/local denotes the IP address of a host in a packet as the packet traverses a router, for example, the local address refers to the IP address of a host when the packet is in the local network, while the global address refers to the IP address of the host when the same packet is traveling in the WAN side.
Note that inside/outside refers to the location of a host, while global/local refers to the IP address of a host used in a packet. Thus, an inside local address (ILA) is the IP address of an inside host in a packet when the packet is still in the local network, while an inside global address (IGA) is the IP address of the same inside host when the packet is on the WAN side. The following table summarizes this information.
Table 56 | NAT Definitions | |
ITEM |
| DESCRIPTION |
Inside |
| This refers to the host on the LAN. |
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Outside |
| This refers to the host on the WAN. |
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Local |
| This refers to the packet address (source or destination) as the packet travels on the LAN. |
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Global |
| This refers to the packet address (source or destination) as the packet travels on the WAN. |
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| 153 |
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