Chapter 25 Bandwidth Management

Connection and Packet Directions

Bandwidth management looks at the connection direction, that is from which interface the connection was initiated and to which interface the connection is going.

A connection has outbound and inbound packet flows. The ZyWALL controls the bandwidth of traffic of each flow as it is going out through an interface or VPN tunnel.

•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 device to a WAN device. Bandwidth management is applied before sending the packets out a WAN interface on the ZyWALL.

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

Figure 229 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.

•Inbound traffic is limited to 500 kbs. The connection initiator is on the LAN1 so inbound means the traffic traveling from the WAN to the LAN1.

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ZyWALL 110/310/1100 Series User’s Guide