Avaya Troubleshooting Routers Guia de Resolução de Problemas descarregar pdf (Página 117)

Troubleshooting a Network Connection Problem

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 the endstation in question cannot ping other nodes on the network,

do the following:

1. Verify that the conﬁguration of the endstation is correct.

2. 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 age out unless you enable the HOST/ARP

cache.

3. 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 duplicate IP addresses. 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:

•“Netw

ork Unreachable Message”

•“Host Did Not Respond Messa

ge”

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.

1 2 ... 112 113 114 115 116 117 118 119 120 121 122 ... 253 254

Sem comentários

Avaya Troubleshooting Routers Guia de Resolução de Problemas Página 117