ZyXEL Communications ZyWall USG 2000 User Manual page 446

Chapter 29 Application Patrol
• Inbound traffic comes back from the WAN zone device to the LAN zone device.
Bandwidth management is applied before sending the traffic out a LAN zone
interface.
Figure 324
LAN
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 LAN to WAN policy for example.
• Outbound traffic is limited to 200 kbps. The connection initiator is on the LAN so
outbound means the traffic traveling from the LAN 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 LAN so
inbound means the traffic traveling from the WAN to the LAN.
Figure 325 LAN to WAN, Outbound 200 kbps, Inbound 500 kbps
Inbound
500 kbps
Bandwidth Management Priority
• The ZyWALL gives bandwidth to higher-priority traffic first, until it reaches its
configured bandwidth rate.
• Then lower-priority traffic gets bandwidth.
• The ZyWALL uses a fairness-based (round-robin) scheduler to divide bandwidth
among traffic flows with the same priority.
• The ZyWALL automatically treats traffic with bandwidth management disabled
as priority 7 (the lowest priority).
446
LAN
to WAN Connection and Packet Directions
Connection
Outbound
BWM
Outbound
Outbound
200 kbps
200 kbps
BWM
Inbound
ZyWALL USG 2000 User's Guide