ZyXEL Communications ISG50-ISDN User Manual page 398

Chapter 25 Bandwidth Management
Connection and Packet Directions
Bandwidth management looks at the connection direction, that is from which zone the connection
was initiated and to which zone the connection is going.
A connection has outbound and inbound packet flows. The ISG50 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 zone device to a WAN zone device. Bandwidth management is
applied before sending the packets out a WAN zone interface on the ISG50.
• 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.
LAN1
Figure 259
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.
398
to WAN Connection and Packet Directions
Connection
Outbound
ISG
BWM
BWM
Inbound
ISG50 User's Guide