Network Cables User Manual

Chapter 8 Application Screens
NSA-220 User’s Guide
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Figure 68 Firewall
• Stateful packet inspection to control access between the Internet and your network and
protect your NSA (and computers) from hacking attacks.
• IDP (Intrusion Detection and Prevention) to detect malicious packets within normal
network traffic and take immediate action against them.
• Anti-virus to check files you download for computer viruses.
8.5.2.2 BitTorrent and Your Firewall
The anti-virus feature on a firewall probably cannot check BitTorrent downloads for viruses,
so use anti-virus software on your computer to scan the NSA for viruses.
When you download using BitTorrent, many other BitTorrent users are also trying to
download the file from you. The firewall slows this down because by default, it only allows
traffic from the Internet in response to a request that originated on the LAN (it lets you get
files from the Internet and blocks those on the Internet from getting files from you).
Figure 69 Firewall Blocking Incoming BitTorrent Requests
To speed up BitTorrent file transfers, configure your firewall’s port forwarding to send
incoming TCP port 6881 and UDP port 6880 connections to the NSA. You probably need to
use your firewall’s HTML (web-based) configuration interface to set this up (see the firewall’s
manual for details). You may also have to configure a corresponding firewall rule.
Hacking
Malicious
Viruses
Packets
Incoming BitTorrent Requests Blocked
Outgoing BitTorrent Request Allowed
Corresponding BitTorrent Reply Allowed