ZyXEL Communications NBG7815, User Manual, Page: 98 / 186

Chapter 9 WAN
NBG7815 User’s Guide
98
Figure 49 Settings > Internet > Passthrough
The following table describes the labels in this screen.
Table 31 Settings > Internet > Passthrough
LABEL DESCRIPTION
ALG Setup
FTP Select Enable to allow TCP packets with a specified port destination to pass through.
H.323 Select Enable to allow peer-to-peer H.323 calls.
SIP Select Enable to make sure SIP (VoIP) works correctly with port-forwarding and address-
mapping rules.
SNMP Select Enable to allow a manager station to manage and monitor the NBG7815 through the
network through SNMP.
RTSP Select Enable to have the NBG7815 detect RTSP traffic and help build RTSP sessions through
its NAT.
IRC Select Enable to allow clients to have real-time communications with others on the Internet.
VPN Passthrough
PPTP Select Enable to allow VPN clients to make outbound PPTP connections. It is required in order
to connect to a PPTP VPN account. If PPTP is disabled, then when a client sends a request to
a VPN server, the server will reply to the NBG7815 and the NBG7815 will drop the request.
When
PPTP is enabled, the NBG7815 will forward the reply from the VPN server to the client
that initiated the request, and the connection will establish successfully.
L2TP Select Enable to allow VPN clients to make outbound L2TP connections. It is required in order
to connect to a L2TP VPN account. If L2TP is disabled, then when a client sends a request to a
VPN server, the server will reply to the NBG7815 and the NBG7815 will drop the request. When
L2TP is enabled, the NBG7815 will forward the reply from the VPN server to the client that
initiated the request, and the connection will establish successfully.