
Troubleshooting Routers
6-12 117379-A Rev. A
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.
Host Did Not Respond Message
If the endstation or router displays this message, do the following:
1. Make sure that the endstation configuration includes a default gateway
definition or listens to a routing protocol.
2. Verify the network addresses of the source and destination devices.
3. If the node that did not respond is on a remote segment, verify that each
router is correctly resolving the ARP address of the next device in the
path.
4. If the node that did not respond is on the local segment, use the MIB
object wfIpInterfaceEntry to verify the address configuration and
interface ICMP counters.
Endstation Can Ping Devices on the Same Segment, but Cannot Ping
the Router
If the endstation can ping other devices on the same segment, but cannot ping the
local interface of the router, do the following:
1. Compare the endstation’s interface number, network number, and
subnet mask to those of the router’s interface. The network and subnet
numbers must be the same, except that the endstation’s subnet mask does
not have to include as many octets as the router’s subnet mask
(F
igure 6-1).
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