Black Box LRA005A-R2 - Manual (Page 96)

ASYNC ROUTER AR-P, AR-5, AND SYNC ROUTER USER’S MANUAL
96
Ethernet Testing
Verify that the local node can communicate with the local Router using the ping command.
On the local Router, issue the ping command by entering:
ping ip_address_of_local_node
If the ping command completes and displays a round-trip time, proceed to the Dial Test section.
If the ping command displays the message
Target did not respond
perform the following steps:
1. Verify that the Ethernet cables on both the local node and the local Router are securely connected.
2. Make sure that the subnet masks on the local node and the local Router match. Also verify that the
(sub)network number of the local node and the local Router match. Display this information using
the ifconfig command.
3. Issue the icmp status command. Note the count of icmplnEchoReps and icmpOutEchos packets
displayed.
4. Try the ping command again using the -s option:
ping -s ip_address_of local_node
5. This ping command continuously sends inquiries to reach the local_node. While the ping command is
executing, watch the network activity LEDs to verify that the Router is sending datagrams out the
Ethernet interface. Stop the ping -s command by entering <Ctrl-c> or by pressing <RETURN>.
6. Issue the icmp status command again. Determine if the count for icmplnEchoReps and icmpOutEchos
increased. If the count for icmpOutEchos increased, and the icmplnEchoReps count did not increase, it
implies that the Router is sending the reachability messages to the local node and not receiving a
response from the local node.
7. Issue the arp command to display the contents of the Router Address Resolution Protocol table. This
table contains IP to Ethernet Address mappings. Determine if a mapping exists for the local node.
The mapping should contain the IP address of the local node and the Ethernet address of the local
node.
8. If there is not a valid ARP entry for local node, try issuing the ping command to another host on the
(sub)network that supports TCP/IP. If this works, try issuing the ping command between the other
host and the local node, if ping is available. Enter the ping command from the other host to the local
node. If this works, it indicates that the local node is capable of responding to ICMP Echo Requests,
but for some reason will not do so for the local Router. If possible, use a network analyzer to trace
datagrams traveling between the local node and the local Router. If you continue to experience the
problem, Call Technical Support for additional help.
Dialup Communication Testing
Approach 1
Once you have verified that the local node can communicate with the local Router, try establishing a
dialup connection from the local Router to the remote Router.