Avaya Troubleshooting Routers Instrukcja Naprawy Pobierz pdf (Strona 121)

Troubleshooting a Network Layer Problem

308656-14.00 Rev 00

6-11

Router Cannot Ping Endstation, but Can Ping Other Endstations on

the Same Segment

If the router can ping other endstations successfully, but not the endstation in

question, and that endstation cannot ping other nodes in the network, do the

following:

Verify that the configuration of the endstation is correct.

Verify that the router’s ARP cache contains the endstation’s MAC

address.

Refer to the MIB object wfIpNetToMediaEntry to locate the ARP cache.

If the MAC address is incorrect, go to the endstation and try to ping the router.

The router should update its ARP cache with the correct MAC address. The

router’s ARP cache entries do not time out unless you enable the HOST/ARP

cache.

Look for an entry with alternating MAC addresses.

If an entry is alternating between one MAC address and another, two devices

on the network have the same IP address. Change the IP address of one of the

devices.

Endstation Cannot Ping the Remote Interface on the Router

Refer to one of the following sections:

•“Network Unreachable Message

”

•“Host Did Not Respond Message

”

Network Unreachable Message

Verify that the endstation’s configuration includes a default gateway.

If an endstation tries to send data to another IP address, it uses its own subnet

mask to determine whether the destination is on the same segment (that is, the

same network and subnet) or a remote segment (that is, a different network and/or

subnet).

If the destination address is on a remote segment, and the endstation’s

configuration includes a default gateway, it tries to route the packet via the

gateway. If the endstation’s configuration does not include a default gateway, it

displays a

Network Unreachable message.

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Avaya Troubleshooting Routers Instrukcja Naprawy Strona 121