IP (Network) Address Issues

IP (Network) Address Issues

The following issues pertain to the basic configuration of your system for the network and the immediate networking hardware.

Default Internet Address

You may see the message:

unix: network: WARNING IRIS'S Internet address is the default

The IP address is not set on this system. To set the IP address, see "Setting the Network Address".

Duplicate IP Address

You may see the messages:

unix: arp: host with ethernet address ... is using my IP address ...
unix: arp: host with ethernet address ... is still using my IP address ...

Your system's IP address is the same as another system's. Each system on the network must have a unique IP address so the network can send information to the correct location. Typically an address conflict occurs when a new system is added to the network and the system's Administrator assigns an IP address that is already in use.

Check to make certain your system is using the correct IP address and then contact the owner of the other system to determine which system needs to change its address.

Ethernet Cable Issues

You may see the following messages:

unix: ec0: no carrier: check Ethernet cable

This message indicates that the Ethernet cable has become loose, or some connection has been lost. This message may appear if the other systems on the network have been shut down and turned off.

unix: ec0: late xmit collision

This message indicates that the Ethernet interface has detected a transmission by another system on the network that was sent beyond the boundaries of the Ethernet standard transmission timing.

The most common causes of the late collisions are due to networks that have been configured outside of the network specification boundaries:

Long AUI transceiver cables. The length of the AUI cable should not exceed 50 meters.
New or recently added network segments that extend the network's total length.
Faulty or failing transceivers.
Faulty or failing Ethernet controllers.

If the problem persists, contact your network administrator or your local support provider.