Technical information

Watson SHDSL Router
Web-based Management Manual
Watson-SHDSL-Router-GUI-Manual.doc
Version 2.3-03
9-100
Revision: 2012-02-29
When adding a routing rule, you need to specify the following:
Name Select the network device.
Destination The destination is the destination host, subnet address, network ad-
dress, or default route. The destination for a default route is 0.0.0.0.
Netmask The network mask is used in conjunction with the destination to de-
termine when a route is used.
Gateway Enter the gateway's IP address.
Metric A measurement of the preference of a route. Typically, the lowest
metric is the most preferred route. If multiple routes have the same metric value,
the default route will be the first in order of appearance.
9.6.1.2 Routing Protocols
Routing Information Protocol (RIP) Select this check-box in order to enable
connections previously defined to use RIP. If this check-box is not selected, RIP will
be disabled for all connections, including those defined to use RIP.
Poison Reverse Watson will advertise acquired route infor-
mation with a high metric, in order for other routers to disregard it.
Do not Advertise Direct Connected Routes Watson will not advertise the
route information to the same subnet device from which it was obtained.
Internet Group Management Protocol (IGMP) Watson provides support for
IGMP multicasting. When a host sends out a request to join a multicast group,
Watson will listen and intercept the group's traffic, forwarding it to the subscribed
host. Watson keeps record of subscribed hosts. When a host requests to cancel its
subscription, Watson queries for other subscribers and stops forwarding the mul-
ticast group's traffic after a short timeout.
Enable IGMP Fast Leave If a host is the only subscriber, Watson will stop
forwarding traffic to it immediately upon request (there will be no query delay).
IGMP Multicast to Unicast Enables Watson to convert the incoming mul-
ticast data stream into unicast format, in order to route it to the specific LAN host
that had requested the data. In this way, Watson will prevent flooding the rest of
the LAN hosts with irrelevant multicast traffic.
Domain Routing When Watson's DNS server receives a reply from an external
DNS server, it will add a routing entry for the IP address of the reply through the
device from which it arrived. This means that future packets from this IP address
will be routed through the device from which the reply arrived.
9.6.2 BGP and OSPF
The 'BGP and OSPF' feature is an implementation of two routing protocols used to
deliver up-to-date routing information to a network or a group of networks, called
Autonomous System.
Border Gateway Protocol (BGP) The main routing protocol of the Internet. It is
used to distribute routing information among Autonomous Systems (for more infor-
mation, refer to the protocol's RFC at http://www.ietf.org/rfc/rfc1771.txt).