3Com 3CRWER300-73 Router Manual PDF (Setup & Configuration Guide)

Page 91 / 172 Scroll up to view Page 86 - 90

Firewall

89

To edit or delete specific existing filtering rules, click on

Edit

or

Delete

for

the appropriate filtering rule.

Figure 70

PC Privileges Add PC Screen

1

Enter a description in the

Client PC Description

field, and the IP address or

IP address range into the

Client PC IP Address

fields.

2

To bypass the URL Filter, check the corresponding

Bypass

checkbox. If you

check this option, then the Web sites and keywords defined in this screen

will not be filtered out.

3

Select the services to be blocked. A list of popular services is listed on this

screen, to block a particular service, check the appropriate

Blocking

checkbox.

If the service to be restricted is not listed here, you can enter a custom

range of ports at the bottom of the screen, under

User Defined Blocked

Ports.

4

If you want the restriction to apply only at certain times, select the

schedule rule to apply from the

Schedule Rule

drop-down menu.

Note that schedule rules are defined on the Schedule Rules screen

(see

page 90

).

5

Click

Apply

to add the settings.

Downloaded from

www.Manualslib.com

manuals search engine

Page 92 / 172

90

C

HAPTER

5: C

ONFIGURING

THE

R

OUTER

Schedule Rule

The Router can be configured to restrict access to the Internet, email or

other network services at specific days and times. Define the time in this

screen, and define the rules in the

PC Privileges

screen (see

page 88

).

Figure 71

Schedule Rule Screen

1

Click

Add Rule

to add a schedule rule

(refer to

Figure 72

).

Figure 72

Add Schedule Rule Screen

2

Enter a name and comment for the schedule rule in the

Name

and

Comment

fields.

3

Specify the schedule rules for the required days and times - note that all

times should be in 24 hour format.

4

Click

Apply

.

Downloaded from

www.Manualslib.com

manuals search engine

Page 93 / 172

Firewall

91

URL Filter

To configure the URL filter feature, use the table on the URL Filter screen

to specify the Web sites (www.somesite.com) and/or keywords you want

to filter on your network.

For example, entering a keyword of

xxx

would block access to any URL

that contains the string

xxx

.

Figure 73

URL Filter Screen

1

Check the

Enable URL Filtering Function

checkbox. The rule table will

appear.

2

Enter the URL address or keywords in the

URL/Keyword

field.

3

Select

Denied or Allowed

from the

Mode

drop-down menu.

To complete this configuration, you will need to create or modify the

filtering rule in the PC Privileges screen (see

page 88

).

From the

PC Privileges Add PC

screen (

Figure 70

), if you check the option:

Bypass URL Filter

, then the Web sites and keywords defined in this screen

will not be filtered out.

Downloaded from

www.Manualslib.com

manuals search engine

Page 94 / 172

92

C

HAPTER

5: C

ONFIGURING

THE

R

OUTER

Advanced

The Advanced section allows you to set additional parameter details for

the Router. You can configure:

■

Security

■

VLAN

■

Static Routes

■

RIP

■

DDNS

■

SNMP

■

Syslog

■

Proxy Arp

■

QoS Settings

Security

Use the Security screen to set the advanced security settings for the

Router.

Figure 74

Security Screen

Downloaded from

www.Manualslib.com

manuals search engine

Page 95 / 172

Advanced

93

■

NAT

— (Network Address Translation), NAT is the method by which

the Router shares the single IP address assigned by your ISP with the

computers on your network.

This function should only be disabled by advanced users, and if your

ISP assigns you multiple IP addresses or you need NAT disabled for an

advanced system configuration. If you have a single IP address and

you turn NAT off, the computers on your network will not be able to

access the Internet. Other problems may also occur.

■

IPSec NAT-T Pass-through — NAT-T (NAT Traversal) is an Internet Draft

proposed to IETF in order to help the problems associated with passing

IPSec traffic through NAT Routers. For NAT-T to work, both ends of the

connection need to support this function. Ensure that you select NAT-T

only if it is needed as it will reduce LAN-WAN throughput. This Router

supports NAT-T draft 2 implementation.

■

Universal Plug and Play — This is a technology that offers seamless

operation of voice messaging, video messaging, games, and other

applications that are Universal Plug and Play compliant. Some

applications require the Router's firewall to be configured in a specific

way to operate properly. This usually requires opening TCP and UDP

ports and in some instances setting trigger ports. An application that

is Universal Plug and Play compliant has the ability to communicate

with the Router, basically "telling" the Router which way it needs the

firewall configured. The Router ships with the Universal Plug and Play

feature disabled. If you are using any applications that are Universal

Plug and Play compliant, and want to take advantage of the Universal

Plug and Play features, you can enable this feature. Simply check the

Enable Universal Plug and Play

checkbox. Click

Apply

to save the

change.

■

WAN Ping Blocking — Computer hackers use what is known as

"Pinging" to find potential victims on the Internet. By pinging a

specific IP address and receiving a response from the IP address, a

hacker can determine that something of interest might be there.

The Router can be set up so it will not respond to an Internet Control

Message Protocol (ICMP) Ping from the outside. This heightens the

level of security of your Router. To turn off the ping response, check

Block ICMP Ping

and click

Apply;

the Router will not respond to an

ICMP ping from the Internet.

Downloaded from

www.Manualslib.com

manuals search engine

Rate

Popular 3Com Models

Famous Router IPs

Famous Router Companies

Bookmark Our Site

Share