Version 6.2
277
February 2011
SIP User's Manual
3. Web-Based Management
3.3.3.7.1 Configuring General Routing
You can choose to setup your device to use static or dynamic routing. Dynamic routing
automatically adjusts how packets travel on the network, whereas static routing specifies a
fixed routing path to destinations. The
Data Routing
item allows you to add, edit and
delete routing rules from the routing table.
This page also allows you to add or edit the device's default route devices by changing
their metric value.
The device supports platforms with multiple physical WAN devices (ports), which can be
used for traffic load balancing, failover, and various routing policies. The multiple WAN
features may also be used to define multiple logical devices (e.g. PPTP VPN, PPPoE) on
device's with a single WAN port.
Load balancing:
traffic load (bandwidth) is distributed between two WAN interfaces.
Load balancing uses the IP pairs technique, in which traffic between a pair of source
and destination IP addresses is routed to the same WAN device for a certain time
frame. A router load balancing on a per-destination basis uses the parallel routes in a
round-robin fashion, and forwards an entire destination-based flow in each pass.
DSCP-based policy routing:
you may specify that traffic matching a certain DSCP
value is routed to a specific device. This is useful for routing different types of data to
different WAN devices. It is also useful if you want to segregate the voice traffic from
the data traffic over two lower-cost broadband circuits in an effort to have better voice
quality.
Failover:
traffic is routed to an active WAN device in case its current WAN device
fails, ensuring connectivity. This transfer of traffic is done regardless of DSCP-based
policy routing rules. An example scenario is Inbound Failover where if a connection
fails and its IP is no longer accessible, the device notifies the other party to use a
different IP, using Dynamic DNS. The device supports the following types of failover:
•
Full Link Redundancy: two or more active WAN devices, usually with equal speed
must be configured. A device set as the default gateway functions as the main
device, while the other one(s) work in the backup mode. This means that if one of
the devices fails, the next one take its place. In this configuration, the devices can
also work in conjunction with the Load Balancing feature to enhance the WAN
throughput.
•
Rollover Connection: during uptime, a rollover device is kept inactive. This is
usually a slow link, for example, a dialup. When all other failover devices lose
connectivity, the rollover device becomes active automatically, and may keep the
same IP as the main device. This allows the use of a slow connection as a
backup to the main fast connection. When a failover device regains connectivity,
the rollover device becomes inactive again. Note that if dialup is done by
demand, activating the backup device may take a noticeable amount of time. The
failover process consists of three phases:
a.
Detection – performed using a DNS test.
b.
Action – when a DNS test fails, the failover process simply removes the
route records of the failed connection. This enables you to reach the desired
failover behavior by configuring the device's routing rules correctly.
c.
Recover – during failover, tests continue to run on the failed connection.
When a test succeeds, the connection recovers its route records.
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