ADSL Router User Manual
NAT ALG Configuration
The need for IP address translation arises when a network's internal IP addresses cannot be used outside the network either for security reasons or because they are invalid for use outside the network. Use of NAT (Network Address Translation) devices allows local hosts on such private networks to transparently access the external global Internet and enables access to selective local hosts from the outside.
ALG (Application Level Gateway) is a security component that augments a firewall or NAT employed in a computer network. ALG allows legitimate application data to pass through the security checks of the firewall that would have otherwise restricted the traffic for not meeting its filter criteria. ALG application specific translation agents allow an application on a host in one address realm to connect to its counterpart running on a host in different realm transparently. An ALG may interact with NAT to set up state, use NAT state information, modify application specific payload and perform whatever else is necessary to get the application running across disparate address realms.
Enable VPN ALG:
VPN ALG allows two or more simultaneous VPN connections through this router. The default setting for VPN ALG is enabled.
Enable SIP ALG:
SIP ALG allows two or more simultaneous VoIP phone calls made by VoIP clients through this router. The default setting for SIP ALG is enabled.
Transparent use of
A SIP ALG provides functionality to allow VoIP traffic to pass both from the private to public and public to private side of the firewall when using Network Address Translation (NAT). The
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