Avaya Configuring IP Services Uživatelský manuál Strana 143

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Configuring Address Resolution
117356-A Rev. A 5-3
In Figure 5-1, the router wants to send a packet to Host C but knows only Host
C’s IP address. The router uses ARP to determine Host C’s physical address, as
follows:
1. The router broadcasts a special packet, called an ARP request, that asks IP
address 140.250.200.4 to respond with its physical address.
2. All network hosts receive the broadcast request.
3. Only Host C responds with its hardware address.
The router maps Host C’s IP address (140.250.200.4) to its physical address
(00 00 A2 00 10 40) and saves the results in an address-resolution cache for future
use.
Note: The router can send out ARP requests even if ARP, which is a
dynamically loaded module, is not currently loaded on the router. As the
network administrator, you must ensure that ARP is loaded correctly on a slot.
To do this through Site Manager, choose Events Manager > Options > Filters;
then select LOADER and Debug, and do a File > Get Current Log File. Verify
that ARP is loaded on a slot by locating the following message in the log:
#xx:01/01/95 10:10:55.00 DEBUG SLOT x LOADER CODE:33
Loader service completed for ARP.EXE 0xxxxxxxxx
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