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address, known as the 'victim' network. This flood of broadcast traffic consumes all
available bandwidth, making communications impossible.
12. What is IP Spoofing attack?
Many DoS attacks also use IP Spoofing as part of their attack. IP Spoofing may be
used to break into systems, to hide the hacker's identity, or to magnify the effect of the
DoS attack. IP Spoofing is a technique used to gain unauthorized access to computers
by tricking a router or firewall into thinking that the communications are coming from
within the trusted network. To engage in IP Spoofing, a hacker must modify the
packet headers so that it appears that the packets originate from a trusted host and
should be allowed through the router or firewall.
13. What are the default ACL firewall rules in P-660?
There are two default ACLs pre-configured in the P-660, one allows all connections
from LAN to WAN and the other blocks all connections from WAN to LAN except
of the DHCP packets.
Configuration
1. How do I configure the firewall?
P-660 supports a embedded web server so that you can use the web browser to
configure it from any OS platform.
2. How do I prevent others from configuring my firewall?
There are several ways to protect others from touching the settings of your firewall.
1. Change the default password since it is required when setting up the firewall
using Telnet, Console or Web browser.
2. Limit who can Telnet to your router. You can enter the IP address of the
secured LAN host in SMT Menu 24.11 to allow Telnet to your P-660. The
default value in this field is 0.0.0.0, which means you do not care which host
is trying to Telnet your P-660.
3. Can I use a browser to configure my P-660?
Yes, you can use a web browser to configure the P-660.
4. Why can't I configure my router using Telnet over WAN?
There are five reasons that Telnet from WAN is blocked.
All contents copyright © 2005 ZyXEL Communications Corporation.
P-660 series Support Notes
21
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