Pc-concepts Full-Rated Router ADSL2+ Manuel d'utilisateur télécharger pdf (Page 83)

with system-defined rules. It is also recommended that you assign rule IDs in multiples of 5 or

10 (e.g., 1000, 1010, 1020) so that you leave enough room between them for inserting new

rules if necessary.

Interface: The interface on which the rule will take effect.

Direction: Specifies whether the rule should apply to packets that are incoming or outgoing on

the selected interface. Incoming refers to packets coming in to the LAN on the interface, and

Outgoing refers to packets going out from the LAN. You can use rules that specify the

incoming direction to restrict external computers from accessing your LAN.

In Interface: The interface from which packets must be forwarded in order for this rule to be

invoked. For example, if the Interface criteria is set to ppp-0, then the In Interface could be set

to usb-0. This specifies that the rule applies only to packets passed from the USB computer

through the router's PPP interface. This option is valid only for rules defined for the outgoing

direction.

Action: Specifies what the rule will do to a packet when the packet matches the rule criteria.

The action can be Accept (forward to destination) or Deny (discard the packet). Do not select

the CallMgt option.

Log Option: When Enabled is selected, a log entry will be created on the system each time

this rule is invoked. Logging may be helpful when troubleshooting. You can also disable

logging, log only packets that match rules, or log only packets that do not match rules. This

information can be e-mailed to designated administrators.

5.7.6 DNS

Domain Name System (DNS) servers map the user-friendly domain names that users

type into their Web browsers (e.g., "yahoo.com") to the equivalent numerical IP addresses that

are used for Internet routing.

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Pc-concepts Full-Rated Router ADSL2+ Manuel d'utilisateur Page 83