Troubleshooting

Diagnostic Tests

Ping

Ping is a network-layer test that sends an Internet Control Message Protocol (ICMP) echo request message to another node that has an IP address and is able to respond to an ICMP echo request message. The router must have IP routing configured in order to use this test.

1.From the Main menu, select the Network Control Language Interpreter (NCL). The NCL prompt then appears at the bottom of the screen. (See figure 3-1 on page 3-16.)

2.At the NCL prompt, enter one of the following commands:

ping x.x.x.x

ping x.x.x.x count

ping x.x.x.x count wait

where:

x.x.x.x is the target node’s IP address in dotted decimal notation.

count (optional) is the number of times to repeat the echo request packet. If count is not included, the packet is sent once.

wait (optional) is how many seconds to wait for a response. If a second integer is not included, the response must be received in five seconds to be successful.

3.You will see a message, either that the target node is alive—meaning that communications are passing successfully from the router to the remote node on a specific link—or that the remote node did not respond. If you cannot reach any remote node, the problem must be isolated to the router, the links used in the test, or all of the remote nodes.

4.Use the Exit command to leave NCL and return to the Main menu: exit [Return]

For more details, refer to “Ping: Sending an ICMP Echo Request Mes- sage” in the Operator’s Reference.

3-18