C
HAPTER
17
| General IP Routing
Address Resolution Protocol
– 441 –
WEB INTERFACE
To trace the route to another device on the network:
1. Click IP, General, Trace Route.
2. Specify the target device.
3. Click Apply.
Figure 263: Tracing the Route to a Network Device
ADDRESS RESOLUTION PROTOCOL
If IP routing is enabled (page 483), the router uses its routing tables to
make routing decisions, and uses Address Resolution Protocol (ARP) to
forward traffic from one hop to the next. ARP is used to map an IP address
to a physical layer (i.e., MAC) address. When an IP frame is received by
this router (or any standards-based router), it first looks up the MAC
address corresponding to the destination IP address in the ARP cache. If
the address is found, the router writes the MAC address into the
appropriate field in the frame header, and forwards the frame on to the
next hop. IP traffic passes along the path to its final destination in this way,
with each routing device mapping the destination IP address to the MAC
address of the next hop toward the recipient, until the packet is delivered
to the final destination.
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