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Nokia M10 User’s Manual
DRAFT
E Copyright Nokia Telecommunications Oy
NTC C33539002SE_A0
6-2
6.3 Routing and bridging
Nokia M10 functions as a brouter, which means that it acts as a
network router for TCP/IP traffic and as a network bridge for
non-routable traffic.
6.3.1 TCP/IP routing
As a router, Nokia M10 keeps track of the networks that are accessible
through each network interface. If you have configured your M10 to
use the Routing Information Protocol (RIPv1 or RIPv2) Nokia M10
exchanges information with other routers to learn about the best routes
to remote networks and to advertise the networks for which the Nokia
M10 has the appropriate route.
When M10 receives a TCP/IP packet it looks up the network portion of
the packet’s destination IP address in its routing table, and then
forwards the packet through the network interface that will let the
packet reach its destination most efficiently.
6.3.2 Static and dynamic routes
Static routes identify pathways to destination networks that are stable
over time or to networks that must always be available, even if a link is
not currently open. These static routes let each router recognize how to
reach the other, even if one router has not heard from the other recently.
Dynamic routes identify pathways to destination networks that may
change over time. Dynamic routes are created and configured when
routers broadcast RIP (Routing information protocol) packets
advertising the networks they can reach and the distance (number of
routers) to each network.
6.3.3 Bridging
Nokia M10 can function as an Ethernet bridge. It can bridge all
protocols or all non-routable (non-IP) protocols between all of its
interfaces. The user just has to specify which interfaces take part in the
bridging function. The bridging function automatically learns the
MAC addresses located behind each of its active interfaces and uses
that information to filter local traffic at an interface to prevent it from
being unnecessarily relayed to other interfaces. For that purpose M10
has a 256-slot MAC address table where it keeps these learned