Maximize Bandwidth Usage - ZyXEL Communications ZyWall USG 2000 User Manual

Chapter 12 Policy and Static Routes
Port triggering is used especially when the remote server responses using a
different port from the port the client computer used to request a service. The
ZyWALL records the IP address of a client computer that sends traffic to a remote
server to request a service (incoming service). When the ZyWALL receives a new
connection (trigger service) from the remote server, the ZyWALL forwards the
traffic to the IP address of the client computer that sent the request.
In the following example, you configure two services for port triggering:
Incoming service: Game (UDP: 1234)
Trigger service: Game-1 (UDP: 5670-5678)
Computer A wants to play a multiplayer online game and tries to connect to game
1
server 1 using port 1234. The ZyWALL records the IP address of computer A when
the packets match a policy with SNAT configured.
Game server 1 responds using a port number ranging between 5670 - 5678. The
2
ZyWALL allows and forwards the traffic to computer A.
Computer A and game server 1 are connected to each other until the connection
3
is closed or times out. Any other computers (such as B or C) cannot connect to
remote server 1 using the same port triggering rule as computer A unless they
are using a different next hop (gateway, outgoing interface, VPN tunnel or trunk)
from computer A or until the connection is closed or times out.
Figure 152 Trigger Port Forwarding Example

Maximize Bandwidth Usage

The maximize bandwidth usage option allows the ZyWALL to divide up any
available bandwidth on the interface (including unallocated bandwidth and any
allocated bandwidth that a policy route is not using) among the policy routes that
require more bandwidth.
When you enable maximize bandwidth usage, the ZyWALL first makes sure that
each policy route gets up to its bandwidth allotment. Next, the ZyWALL divides up
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ZyWALL USG 2000 User's Guide