ZyXEL NBG420N Manuel d'utilisateur télécharger pdf (Page 159)

Chapter 13 Firewall

NBG420N User’s Guide

159

Available Services This is a list of pre-defined services (ports) you may prohibit your LAN computers

from using. Select the port you want to block using the drop-down list and click

Add to add the port to the Blocked Services field.

Blocked Services This is a list of services (ports) that will be inaccessible to computers on your LAN

once you enable service blocking.

Custom Port A custom port is a service that is not available in the pre-defined Available

Services list and you must define using the next two fields.

Type Choose the IP port (TCP or UDP) that defines your customized port from the drop

down list box.

Port Number Enter the port number range that defines the service. For example, if you want to

define the Gnutella service, then select TCP type and enter a port range from

6345 to 6349.

Add Select a service from the Available Services drop-down list and then click Add to

add a service to the Blocked Services

Delete Select a service from the Blocked Services list and then click Delete to remove

this service from the list.

Clear All Click Clear All to empty the Blocked Services.

Schedule to Block

Day to Block: Select a check box to configure which days of the week (or everyday) you want

service blocking to be active.

Time of Day to

Block (24-Hour

Format)

Select the time of day you want service blocking to take effect. Configure blocking

to take effect all day by selecting All Day. You can also configure specific times by

selecting From and entering the start time in the Start (hour) and Start (min)

fields and the end time in the End (hour) and End (min) fields. Enter times in 24-

hour format, for example, "3:00pm" should be entered as "15:00".

Log

Active (Log

packets match

this rule)

Select this to log packets that match this rule. Go to the Log Settings page and

select the Access Control logs category to have the NBG420N record these logs.

Misc setting

Bypass Triangle

Route

Select this check box to have the NBG420N firewall ignore the use of triangle

route topology on the network.

Max NAT/Firewall

Session Per User

Type a number ranging from 1 to 2048 to limit the number of NAT/firewall sessions

that a host can create.

Apply Click Apply to save the settings.

Reset Click Reset to start configuring this screen again.

Cancel Click Cancel to return to the Services screen without saving any changes.

Table 59 Security > Firewall > Services > Adding a Rule

LABEL DESCRIPTION

1 2 ... 154 155 156 157 158 159 160 161 162 163 164 ... 339 340

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ZyXEL NBG420N Manuel d'utilisateur Page 159

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