Firewall; Firewall - Ip Filtering - NetComm NB6 User Manual

The VPN ALG allows two or more simultaneous VPN connections through this router
Enable SIP ALG
The SIP ALG allow two or more simultaneous VoIP phone calls made by VoIP clients through
this router

Firewall

The firewall is a kind of software that interrupts the data between the Internet and your computer. It is
the TCP/IP equivalent of a security gate at the entrance to your company. All data must pass through it,
and the firewall (functions as a security guard) will allow only authorized data to be passed into the
LAN.
What the firewall can do? It can:
To keep track of the performance of IP Filter, a logging device is used. The device supports logging of
the TCP/UDP and IP packet headers and the first 129 bytes of the packet (including headers) whenever
a packet is successfully passed through or blocked, and whenever a packet matches a rule being setup
for suspicious packets.
An example for firewall setup:
This picture shows the most common and easiest way to employ the firewall. Basically, you can install a
packet-filtering router at the Internet gateway and then configures the filter rule in the router to block
or filter protocols and addresses. The systems behind the router usually have a direct access to the
Internet; however some dangerous services such as NIS and NFS are usually blocked.
For the security of your router, setting the firewall is an important issue.
Firewall – IP Filtering
This page allows you to specify the IP packet filtering rules to prevent the services accessed from the
Internet hosts or limit the Internet access for local hosts.
Choose Disabled to disable the firewall function. Click Enabled to invoke the settings that you set in this
web page.
•
Deny or permit any packet from passing through explicitly
•
Distinguish between various interfaces and match on the following fields:
•
Source and destination IP address
•
Port