ZyXEL Communications USG40 User Manual page 408

negotiate paths or remember state information for every flow. In addition, applications do not have
to request a particular service or give advanced notice of where the traffic is going.
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/USG 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/USG.
• Inbound traffic comes back from the WAN device to the LAN1 device. Bandwidth management is
applied before sending the traffic out a LAN1 interface.
LAN1
to WAN Connection and Packet Directions
Figure 284
LAN1
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.
Chapter 24 BWM (Bandwidth Management)
Connection
BWM
Outbound
BWM
ZyWALL/USG Series User's Guide
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Inbound