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Manage ALG Settings
PPTP Passthrough
L2TP Passthrough
IPSec Passthrough
FTP ALG
TFTP ALG
RTSP ALG
SIP ALG
5.8.4 Virtual Servers Settings
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NAT Forwarding
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Virtual Servers
Virtual Servers allows you to set up a server in the local network to host online services, such as FTP, VoIP, printer, HTTP,
or web servers. Meanwhile, the virtual server can keep the local network invisible to the public Internet. Internet traffic is
directed to a specifically assigned port(s) of a router (or routers) on your local network. Different services can be redirected
to certain ports. For instance, Port 80 is set for FTP service. You may establish various sets of port redirections to provide
multiple Internet services on different local computers through a single Internet IP address.
To set up virtual servers,
Click Add New in the Binding List.
1.
2.
Use the toggle switch to turn on Enable This Entry.
3.
Enter the parameters to set up a virtual server.
setup.verizon.com/businessinternetgateway
Point-to-Point Tunneling Protocol (PPTP) Passthrough allows PPTP to pass through NAT router,
which enables VPN clients connected to the router to make PPTP connections.
Layer 2 Tunneling Protocol (L2TP) is a tunneling protocol for point-to-point sessions via the
Internet on layer 2. It is another passthrough protocol to transmit packets in VPNs.
Internet Protocol Security (IPsec) is a protocol suite for data packet encryptions and secure
network connections. IPSec Passthrough allows IPSec tunnels to pass through the router.
File Transfer Protocol is a widely and commonly used method of exchanging files over IP
networks. The FTP ALG scans PORT and PASV commands, as well as 227 responses. It
performs NAT on the IP and port, or both in the data transfer between client and server.
Trivial File Transfer Protocol (TFTP) is a simple protocol used for processing TFTP packets and
sends requests to UDP destination port 69. Certain firewall and NAT services require TFTP ALG
configurations.
The Real Time Streaming Protocol (RTSP) is a network control protocol that controls the delivery
of real-time media data. This ALG is mostly used in servers that control streaming media.
SIP ALG is a feature found in most networked routers, operating as a function of its firewall. It
consists of two different technologies: SIP and ALG.
•
Session Initiation Protocol (SIP) – The underlying service that powers all Voice over Internet
Protocol (VoIP) phones, apps, and devices. SIP manages registering devices, maintaining
call presence, and overseeing the call audio. Read more about SIP in our deep dive here.
•
Application Layer Gateway (ALG) – Routers segments your ISP and your internal network
through a process known as Network Address Translation (NAT). An ALG acts as a proxy
to rewrite the destination addresses in data packets for improved connectivity.
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