SonicWALL TELE3 SP, Руководство администратора

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Advanced Features Page 97
prioritize traffic based on Rules created in the Access section of the SonicWALL Management
interface. By controlling the amount of bandwidth to an application or user, the network
administrator can prevent a small number of applications or users to consume all available
bandwidth.
Key Features of SonicWALL Bandwidth Management
• Outgoing traffic is managed according to traffic type: Telnet, FTP, HTTP, etc.
• Network Access Rules can be configured to allocate bandwidth based on IP addresses.
• VPN traffic can also be managed by enabling bandwidth management on the VPN
Configure tab, and then specifying the Guaranteed , Maximum , and priority of all VPN
traffic through the SonicWALL.
Note : Bandwidth management cannot be configured for individual VPN Security Associations.
It can only be configured for all VPN traffic.
Key Benefits of SonicWALL Bandwidth Management
• The network administrator has full control of outbound network traffic and can prevent
traffic congestion on the network.
• Prevent a small number of applications and users from consuming all available bandwidth.
• Quality of Service policies can be implemented across the network allowing priority
applications to run smoothly.
How does SonicWALL Bandwidth Management Work?
Bandwidth management works by allocating traffic to a class based upon application type,
source or destination addresses, or a combination of both. It then assigns individual limits for
each class of network traffic. By assigning priorities to network traffic, applications requiring a
quick response time, such as telnet, can take precedence over traffic requiring less response
time, such as FTP.
Balancing the bandwidth allocated to different network traffic and then assigning priorities to
traffic can improve network performance.
Traffic is classified in the following manner:
• TCP/IP or UDP ports
• Services such as FTP, HTTP, E-mail, SIP
• Source or destination IP address
SonicWALL Bandwidth Management can assign a portion of the available bandwidth and a
priority to each class of network traffic. Priorities rank from 0 (highest), to 7 (lowest).
The packet classifier analyzes a packet when it arrives for its packet protocol, source
information, and destination information. It then allocates the packet to a class queue where it
waits to be processed. If the queue is full, the packet is dropped. Normal retransmission of data
ensures that the packet is sent again.
Class queues are processed based on the amount of bandwidth allocated (guaranteed and
maximum), and the priority assigned to the class queue. Within the class queue, packets are