ZyXEL Communications G-2000 Plus User Manual
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ZyAIR G-2000 Plus User’s Guide
133
Chapter 9 WAN
Network Address
Translation
Network Address Translation (NAT) allows the translation of an Internet
protocol address used within one network (for example a private IP address
used in a local network) to a different IP address known within another network
(for example a public IP address used on the Internet).
Choose None to disable NAT.
Choose SUA Only if you have a single public IP address. SUA (Single User
Account) is a subset of NAT that supports two types of mapping: Many-to-One
and Server.
Choose Full Feature if you have multiple public IP addresses. Full Feature
mapping types include: One-to-One, Many-to-One (SUA/PAT), Many-to-
Many Overload, Many- One-to-One and Server. When you select Full
Feature you must configure at least one address mapping set!
For more information about NAT refer to the NAT chapter in this User's Guide.
Metric (PPPoE and
PPTP only)
This field sets this route's priority among the routes the ZyAIR uses.
The metric represents the "cost of transmission". A router determines the best
route for transmission by choosing a path with the lowest "cost". RIP routing
uses hop count as the measurement of cost, with a minimum of "1" for directly
connected networks. The number must be between "1" and "15"; a number
greater than "15" means the link is down. The smaller the number, the lower
the "cost".
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.
Private (PPPoE and
PPTP only)
This parameter determines if the ZyAIR will include the route to this remote
node in its RIP broadcasts. If set to Yes, this route is kept private and not
included in RIP broadcast. If No, the route to this remote node will be
propagated to other hosts through RIP broadcasts.
RIP Direction
RIP (Routing Information Protocol) allows a router to exchange routing
information with other routers. The RIP Direction field controls the sending
and receiving of RIP packets.
Choose Both, None, In Only or Out Only.
When set to Both or Out Only, the ZyAIR will broadcast its routing table
periodically.
When set to Both or In Only, the ZyAIR will incorporate RIP information that it
receives.
When set to None, the ZyAIR will not send any RIP packets and will ignore any
RIP packets received.
By default, RIP Direction is set to Both.
RIP Version
The RIP Version field controls the format and the broadcasting method of the
RIP packets that the ZyAIR sends (it recognizes both formats when receiving).
Choose RIP-1, RIP-2B or RIP-2M.
RIP-1 is universally supported; but RIP-2 carries more information. RIP-1 is
probably adequate for most networks, unless you have an unusual network
topology. Both RIP-2B and RIP-2M sends the routing data in RIP-2 format; the
difference being that RIP-2B uses subnet broadcasting while RIP-2M uses
multicasting. Multicasting can reduce the load on non-router machines since
they generally do not listen to the RIP multicast address and so will not receive
the RIP packets. However, if one router uses multicasting, then all routers on
your network must use multicasting, also. By default, the RIP Version field is
set to RIP-1.
Table 40 WAN: IP
LABEL
DESCRIPTION