Chapter 28 Application Patrol

•The outbound traffic flows from the connection initiator to the connection responder.

•The inbound traffic flows from the connection responder to the connection initiator.

For example, a LAN1 to WAN connection is initiated from LAN1 and goes to the WAN.

•Outbound traffic goes from a LAN1 zone device to a WAN zone device. Bandwidth management is applied before sending the packets out a WAN zone interface on the ZyWALL.

•Inbound traffic comes back from the WAN zone device to the LAN1 zone device. Bandwidth management is applied before sending the traffic out a LAN1 zone interface.

Figure 267 LAN1 to WAN Connection and Packet Directions

LAN1

Connection

Outbound BWM

BWM

Inbound

Outbound and Inbound Bandwidth Limits

You can limit an application’s outbound or inbound bandwidth. This limit keeps the traffic from using up too much of the out-going interface’s bandwidth. This way you can make sure there is bandwidth for other applications. When you apply a bandwidth limit to outbound or inbound traffic, each member of the out-going zone can send up to the limit. Take a LAN1 to WAN policy for example.

•Outbound traffic is limited to 200 kbps. The connection initiator is on the LAN1 so outbound means the traffic traveling from the LAN1 to the WAN. Each of the WAN zone’s two interfaces can send the limit of 200 kbps of traffic.

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ZyWALL USG 50 User’s Guide