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Internet Settings
79
DNS
Domain Name Service (or Server) is an Internet service that translates
domain names into IP addresses. Because domain names are alphabetic,
they're easier to remember. The Internet however, is really based on IP
addresses. Every time you use a domain name, a DNS service must
translate the name into the corresponding IP address. For example, the
domain name www.example.com might translate to 198.105.232.4.
Figure 61
DNS Screen
If the DNS information is automatically provided by your ISP every time
you connect to it, check the
Automatic from ISP
checkbox.
If your ISP provided you with specific DNS addresses to use, enter them
into the appropriate fields on this screen and click
Apply
.
Many ISPs do not require you to enter this information into the Router. If
you are using a Static IP connection type, you may need to enter a
specific DNS address and secondary DNS address for your connection to
work properly. If your connection type is Dynamic or PPPoE, it is likely that
you do not have to enter a DNS address.
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Page 82 / 172
80
C
HAPTER
5: C
ONFIGURING
THE
R
OUTER
Clone MAC address
To configure the Hostname and Clone MAC Address information for your
Router, select
Internet Settings
, then go to the
Clone MAC address
tab.
Figure 62
Hostname and Clone MAC Address Screen
1
Some ISPs require a host name. If your ISP has this requirement, enter the
host name in the
Host Name
field.
2
Three different ways to configure the WAN MAC Address:
■
If your ISP requires an assigned MAC address, enter the values in the
WAN
MAC address
field.
or
■
If the computer that you are using is the one that was previously
connected directly to the cable modem, click
Clon
e.
or
■
To reset the MAC Address to the default, click
Reset MAC
.
3
Click
Apply
to save the settings.
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Page 83 / 172
Firewall
81
Firewall
This section is for configuration settings of the Router’s firewall function.
Your Router is equipped with a firewall that will protect your network
from a wide array of common hacker attacks including Ping of Death
(PoD) and Denial of Service (DoS) attacks. You can turn the firewall
function off if needed. Turning off the firewall protection will not leave
your network completely vulnerable to hacker attacks, but 3Com
recommends that you leave the firewall enabled whenever possible.
SPI
Stateful Packet Inspection (SPI) - The Intrusion Detection Feature of the
Router limits access for incoming traffic at the WAN port.
This feature is called a "stateful" packet inspection, because it examines
the contents of the packet to determine the state of the communications;
i.e., it ensures that the stated destination computer has previously
requested the current communication. This is a way of ensuring that all
communications are initiated by the recipient computer and are taking
place only with sources that are known and trusted from previous
interactions. In addition to being more rigorous in their inspection of
packets, stateful inspection firewalls also close off ports until connection
to the specific port is requested.
Figure 63
Firewall Screen
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Page 84 / 172
82
C
HAPTER
5: C
ONFIGURING
THE
R
OUTER
To enable the firewall function:
1
Select the level of protection (High, Medium, or Low) that you desire from
the
Firewall level
drop-down menu.
2
Click
Apply
.
■
For low and medium levels of firewall protection, refer to
Figure 64
.
For low level of firewall protection, the DoS and SPI functions are both
off. For medium level of firewall protection, DoS in on, but SPI is off.
■
For high level of firewall protection, refer to
Figure 65
. Both DoS and
SPI are on for this level of firewall protection. The higher the firewall
level is, the safer that your network is.
Figure 64
Low and Medium Level Firewall Protection Screen
When abnormal network activity occurs, an alerting email will be sent out
to you. Enter the following information to receive the email:
■
Your E-mail Address
■
SMTP Server Address
■
User name
■
Password
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Page 85 / 172
Firewall
83
Figure 65
High Level Firewall Protection Screen
If you select high level of protection, you would have an option to
configure additional parameters for the firewall.
■
Fragmentation half-open wait - Configures the number of seconds
that a packet state structure remains active. When the timeout value
expires, the Router drops the un-assembled packet, freeing that
structure for use by another packet.
■
TCP SYN wait - Defines how long the software will wait for a TCP
session to synchronize before dropping the session.
■
TCP FIN wait - Specifies how long a TCP session will be maintained
after the firewall detects a FIN packet.
■
TCP connection idle timeout - The length of time for which a TCP
session will be managed if there is no activity.
■
UDP session idle timeout - The length of time for which a UDP session
will be managed if there is no activity.
■
H.323 data channel idle timeout - The length of time for which an
H.323 session will be managed if there is no activity.
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