Basic troubleshooting

This section explains how to use the basic troubleshooting utilities that Ethernet TAP probe provides. These utilities help you diagnose communications problems.

Using ping command

Use the ping command at the core> prompt to verify that the Ethernet TAP probe is up and running on your network.

To verify network communications

Connect to the Ethernet TAP probe internal setup utility, as explained in Connecting to the Ethernet TAP Probe Setup Utility.
Verify communications by entering this command at the core> prompt:
```
ping ipaddress | hostname
```
For example, to ping the Ethernet TAP probe elvis at IP address 128.9.230.61, enter the command as follows:
```
ping 128.9.230.61
```
- or -
```
ping elvis
```
Note: When first establishing communications, you will have to ping the IP address you used during the setup process, as the Ethernet TAP probe does not automatically recognize the hostname. To ping a hostname, the Ethernet TAP probe internal host table must first be updated. For more information on updating the Ethernet TAP probe internal host table see Using the host Command topic.

Using netstat command

The netstat command displays all the network statistics when entered without options.

To run netstat command

Connect to the internal setup utility of Ethernet TAP probe.
At the core> prompt, enter the netstat by using this syntax:
```
netstat [eth|icmp|ip|tcp|udp|inet|arp|route|host|mem]
```

Select the desired options to reduce the amount of data displayed. Table below shows the descriptions of the netstat options.

Table 1. Netstat options
Option	Description
`eth`	Displays Ethernet device status.
`icmp`	Displays ICMP protocol statistics.
`ip`	Displays IP protocol statistics.
`tcp`	Displays TCP protocol statistics.
`udp`	Displays UDP protocol statistics.
`inet`	Displays network connections.
`arp`	Displays ARP table.
`route`	Displays route table.
`host`	Displays host table.
`mem`	Displays network memory statistics.