Avaya Configuring and Managing Routers with Site Manager Uživatelský manuál stáhnout pdf (Strana 299)

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Using the Ping Option

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11-5

Figure 11-4. Ping Does Not Respond Window

• An “ICMP host unreachable from <y.y.y.y>” message -- appears if the router

whose address is y.y.y.y cannot forward the ping request any further along the

path to the target device. IP updates its IP routing or Address Resolution

Protocol (ARP) table accordingly. For example:

ping: ICMP host unreachable from 192.32.243.1

• An “is unreachable” message -- appears if the router previously issued an

“ICMP host unreachable from <y.y.y.y>” message. Within 40 seconds, the

router receives a subsequent ICMP echo request addressed to the same target

device. The ARP times out or the address is not resolved. For example:

ping: 192.32.1.151 is unreachable

1 2 ... 294 295 296 297 298 299 300 301 302 303 304 ... 385 386

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