Netopia Firmware 4000-Series Manuel d'utilisateur télécharger pdf (Page 305)

Understanding IP Addressing B-13

Let’s see how a packet from the Internet gets routed to the host with IP address a.b.c.249, which is ser ved by

Router C. The packet ﬁrst arrives at Router A, which delivers it to its local network (a.b.c.0). The packet is then

received by the Router, which examines its destination IP address.

The Router compares the packet’s destination IP address with the routes in its IP routing table. It begins with

the route at the bottom of the list and works up until there’s a match or the route to the default gateway is

reached.

When a.b.c.249 is masked by the ﬁrst route’s subnet mask, it yields a.b.c.248, which matches the network

address in the route. The Router uses the connection proﬁle associated with the route to connect to Router C,

and then forwards the packet. Router C delivers the packet to the host on its local network.

IP Routing Table

Network Address-Subnet Mask-----via Router------Port------------------Type----

----------------------------------SCROLL UP-----------------------------------

0.0.0.0 0.0.0.0 a.b.c.1 -- Other

127.0.0.1 255.255.255.255 127.0.0.1 Loopback Local

a.b.c.128 255.255.255.192 a.b.c.128 WAN Local

a.b.c.248 255.255.255.248 a.b.c.248 WAN Local

---------------------------------SCROLL DOWN----------------------------------

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Netopia Firmware 4000-Series Manuel d'utilisateur Page 305