User manual

Wireless Adapter RNX-N4 User Manual

• Application Layer Gateway (ALG) Configuration: Place a check in appropriate feature

boxes to enable them. . Some protocols and applications require special handling of

the IP payload to make them work with network address translation (NAT). Each ALG

provides special handling for a specific protocol or application. A number of ALGs for

common applications are enabled by default.

1. PPTP: Allows multiple machines on the LAN to connect to their corporate

networks using PPTP protocol. When the PPTP ALG is enabled, LAN computers

can establish PPTP VPN connections either with the same or with different VPN

servers. When the PPTP ALG is disabled, the router allows VPN operation in a

restricted way -- LAN computers are typically able to establish VPN tunnels to

different VPN Internet servers but not to the same server. The advantage of

disabling the PPTP ALG is to increase VPN performance. Enabling the PPTP

ALG also allows incoming VPN connections to a LAN side VPN server (refer to

Advanced → Virtual Server).

2. IPSec: (VPN) Allows multiple VPN clients to connect to their corporate networks

using IPSec. Some VPN clients support traversal of IPSec through NAT. This

option may interfere with the operation of such VPN clients. If you are having

trouble connecting with your corporate network, try disabling this option. Check

with the system adminstrator of your corporate network whether your VPN client

supports NAT traversal.

3. RTSP: Allows applications that use Real Time Streaming Protocol to receive

streaming media from the internet. QuickTime and Real Player are some of the

common applications using this protocol.

4. Windows/MSN Messenger: Supports use on LAN computers of Microsoft

Windows Messenger (the Internet messaging client that ships with Microsoft

Windows) and MSN Messenger. The SIP ALG must also be enabled when the

Windows Messenger ALG is enabled.

5. FTP: Allows FTP clients and servers to transfer data across NAT.

6. H.323 (Netmeeting): Allows H.323 (specifically Microsoft Netmeeting) clients to

communicate across NAT server.

7. SIP: Allows devices and applications using VoIP (Voice over IP) to communicate

across NAT. Some VoIP applications and devices have the ability to discover

NAT devices and work around them. This ALG may interfere with the operation

of such devices. If you are having trouble making VoIP calls, try turning this ALG

off.

8. Wake-On-LAN: This feature enables forwarding of "magic packets" (that is,