Commands to troubleshoot communications

The following commands are used to troubleshoot problems connecting to your network. The procedures for troubleshooting communications are covered in Troubleshooting.

arp

Use the arp command to edit the arp table by assigning hostnames to specific Ethernet addresses. Without options it displays the current arp table.

Syntax

  arp [add hostname ethernet_address | delete hostname]

Options

`add` `hostnameethernet_address`	Assign a `hostname` alias to an Ethernet address in the arp table.
`delete` `hostname`	Delete a `hostname` alias from the arp table.

host

Use the host command to edit the host table by assigning hostnames to specific IP addresses without permanently storing the routing tables in the flash EPROM of the Ethernet TAP probe. Without options it displays the current host table.

Syntax

  host [add hostname ip_address | delete hostname ip_address]

Options

`add` `hostnameip_address`	Assign a `hostname` alias to an IP address in the host table.
`delete` `hostnameip_address`	Delete a `hostname` alias from the host table.

netstat

Entered without options the netstat command displays all the network statistics. Use with arguments to reduce the amount of data displayed.

Syntax

  netstat [inet|eth|icmp|ip|tcp|udp|arp|route|host|mem]

Options

`inet`	Display network connections.
`eth`	Display Ethernet device status.
`icmp`	Display ICMP protocol statistics.
`ip`	Display IP protocol statistics.
`tcp`	Display TCP protocol statistics.
`udp`	Display UDP protocol statistics.
`arp`	Display ARP table.
`route`	Display route table.
`host`	Display host table.
`mem`	Display network memory statistics.

ping

Use the ping command to verify that the Ethernet TAP probe is connected to your network.

Syntax

  ping [hostname | ip_address] [size] [cnt]

Options

`hostname`	Use the `hostname` stored in Ethernet TAP probe host table (see the host command).
`ip_address`	Use the IP address of the host you are trying to reach.
size	The size, in bytes, to use for request packets.
cnt	The number of packets to send.

route

Use the route command to test network routing without permanently storing the routing tables in the Ethernet TAP probe flash EPROM. Without options it displays the current route table or default gateway.

Syntax

  route [add destination gateway | delete destination gateway]

Options

`add` `destinationgateway`	Add a dynamic route to the route table.
`delete` `destinationgateway`	Delete a dynamic route from the route table.