ZyXEL Communications LTE7460-M608 User Manual page 58

Chapter 7 Networking
File Transfer Protocol
This is a method of transferring data from one computer to another over a network such as the Internet.
DYNDNS Wildcard
Enabling the wildcard feature for your host causes *.yourhost.dyndns.org to be aliased to the same IP
address as yourhost.dyndns.org. This feature is useful if you want to be able to use, for example,
www.yourhost.dyndns.org and still reach your hostname.
If you have a private WAN IP address, then you cannot use Dynamic DNS.
Firewall
A firewall protects your LTE7460-M608 and network from attacks by hackers on the Internet and control
access to it. The firewall:
• allows traffic that originates from your LAN computers to go to all other networks.
• blocks traffic that originates on other networks from going to the LAN.
• blocks SYN and port scanner attacks.
By default, the LTE7460-M608 blocks DDOS, LAND and Ping of Death attacks whether the firewall is
enabled or disabled.
The following figure illustrates the firewall action. User A can initiate an IM (Instant Messaging) session
from the LAN to the WAN (1). Return traffic for this session is also allowed (2). However other traffic
initiated from the WAN is blocked (3 and 4).
Figure 44 Default Firewall Action
Inside/Outside and Global/Local
Inside/outside denotes where a host is located relative to the LTE7460-M608, for example, the computers
of your subscribers are the inside hosts, while the web servers on the Internet are the outside hosts.
Global/local denotes the IP address of a host in a packet as the packet traverses a router, for example,
the local address refers to the IP address of a host when the packet is in the local network, while the
global address refers to the IP address of the host when the same packet is traveling in the WAN side.
LTE7460-M608 User's Guide
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