Investigating network troubles

Identify networking problems:

• Review the /etc/hosts file to verify that the system you are trying to reach is in the file.

• Use the ping command to determine if another system is responding. See ping(1Mtcp) and ``Troubleshooting TCP/IP'' for more information.

• Verify that the Internet services daemon inetd is running by running the ps -ef command.

• Use the ifconfig(1Mtcp) command to review the configuration information for all currently-installed network devices. You can identify an interface that is not running. See ifconfig(1Mtcp) and ``Verifying the configuration of network interfaces'' for more information.

• Use the netstat(1Mtcp) command to review the status of network traffic and interface information. You can request the status by ICMP, IP, TCP, and UDP protocol or for all protocols. See netstat(1Mtcp) and ``Displaying per-protocol statistics'' for more information.

• Use the netinfo(1Mbnu) command to list the devices and protocols installed on your machine and to display specific protocol and device mappings. You can identify any protocols that are not mapped to any device and any device that is not mapped to any protocol. See netinfo(1Mbnu) and ``Listing entries in the netdrivers file'' for more information.

• The system status daemon rwhod can degrade system and network performance. You are advised not to run it.

• The routing daemon routed is run by default. If your system has limited memory and there are no routers on your network, you can disable this daemon. See Administering TCP/IP and Internet services for more information.