Actiontec MI424-WR-Rev-C Router Manual PDF (Setup & Configuration Guide)

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Conﬁguring Security Settings

6.2

Firewall

6

96

For example, when accessing a website on the Internet, a request is sent out to

the Internet for this site. When the request reaches the FiOS Router, the firewall

identifies the request type and origin (HTTP and a specific computer in the local

network, in this case). Unless the FiOS Router is configured to block requests of

this type from this computer, the firewall allows this request to pass out onto

the Internet. When the website is returned from the web server, the firewall will

associate it with this session and allow it to pass, regardless of whether HTTP

access from the Internet to the local network is blocked or permitted.

Note that it is the origin of the request, not subsequent responses to this

request, which determines whether a session can be established or not.

6.2a

General Screen

The “General” screen is used to configure the FiOS Router’s basic firewall settings.

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The FiOS Router features three pre-defined firewall security levels:

Maximum

,

Typical

, and

Minimum

. The table below summarizes the behavior of the FiOS

Router for each of the three security levels.

Security Level

Internet requests

(incoming traffic)

Local network requests

(outgoing traffic)

Maximum

Security

Blocked

- No access

to local network from

Internet, except as

configured in the Port

Forwarding,

DMZ

host, and

Remote Access screens.

Limited

- Only commonly

used services, such as

web browsing and email,

are permitted.

Typical Security

Blocked

- No access

to local network from

Internet, except as

configured in the Port

Forwarding,

DMZ

host, and

Remote Access screens.

Unrestricted

- All services

are permitted, except as

configured in the Access

Control screen.

Minimum

Security

Unrestricted

- Permits

full access from Internet

to local network; all

connection attempts

permitted.

Unrestricted

- All services

are permitted, except as

configured in the Access

Control screen.

These services include Telnet, FTP, HTTP, HTTPS, DNS, IMAP, POP3 and SMTP.

Note:

Some applications (such as some Internet messengers and Peer-To-Peer

client applications) tend to use these ports if they cannot connect with their

own default ports. When applying this behavior, these applications will not be

blocked outbound, even at the Maximum Security level.

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Conﬁguring Security Settings

6.3

Access Control

6

98

To configure the FiOS Router’s firewall security settings:

From the General screen, select a security level by clicking the appropriate

1.

radio button. Using the Minimum Security setting may expose the local

network to significant security risks, and thus should only be used for short

periods of time.

Check the “Block IP Fragments” box to protect the local network from

2.

a common type of hacker attack that uses fragmented data packets to

sabotage the network. Note that VPN over IPSec and some UDP-based

services make legitimate use of IP fragments. IP fragments must be allowed

to pass into the local network to use these services.

Click

3.

Apply

to save changes.

6.3

Access Control

Access control is used to block specific computers within the local network (or

even the whole network) from accessing certain services on the Internet. For

example, one computer can be prohibited from surfing the Internet, another

computer from transferring files using FTP, and the whole network from

receiving incoming email.

Access control defines restrictions on the types of requests that can pass from

the local network out to the Internet, and thus may block traffic flowing in both

directions. In the email example given above, computers in the local network

can be prevented from receiving email by blocking their outgoing requests to

POP3 servers on the Internet.

Access control also incorporates a list of preset services in the form of

applications and common port settings.

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6.3a

Allow or Restrict Services

To view and allow/restrict these services:

Select

1.

Access Control

from the left side of any Security screen. The “Access

Control” screen appears.

Note:

The “Allowed” section is only visible when the firewall is set to “Maximum.”

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Conﬁguring Security Settings

6.3

Access Control

6

100

Click

2.

Add

. The “Add Access Control Rule” screen appears.

Note:

To block a service, click

Add

in the “Blocked” section of the Access Control

screen. To allow outgoing traffic, click

Add

in the “Allowed” section of the screen.

If this access control rule applies to all networked devices, select

3.

Any

from

the “Networked Computer/Device” list box. If this rule applies to certain

devices only, select

Specify Address

and click

Add

. Then, create and add

a network object (for more details about adding network objects, see the

“Advanced Settings” chapter of this manual).

Select the Internet protocol to be allowed or blocked from the “Protocol”

4.

drop-down list.

If the rule will be active all the time, select

5.

Always

from the “When should

this rule occur?” drop-down list. If the rule will only be active at certain times,

select

Specify Schedule

and click

Add

. Then, add a schedule rule (for more

details about schedule rules, see the “Advanced Settings” chapter of this

manual).

Click

6.

Apply

to save the changes. The Access Control screen will display a

summary of the new access control rule.

Note:

To block a service not included in the list, select

Specify Protocol

from

the Protocol drop-down menu. The “Edit Service” screen appears. Define the

service, then click

OK

. The service will then be automatically added to the top

section of the “Add Access Control Rule” screen, and will be selectable.

An access control can be disabled and the service made available without

having to remove the service from the Access Control table. This may be

useful to make the service available temporarily, with the expectation that the

restriction will be reinstated later.

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