Nokia EM7500 Installation Manual page 98

7
Troubleshooting
Common Ethernet Problems—Connectivity with Attached
Device
Problem No link light.
Solution You might have used the wrong cable. Use a crossover cable
between an IP390 appliance and a host, and a straight-through cable between
an appliance and a hub.
Problem Solid data and activity LED.
Solution You might have set the wrong speed. Verify that the speeds match
on each end of the Ethernet connection (10 Mbps or 100Mbps).
Problem Port not enabled.
Solution Verify from the Interface page in Network Voyager that the
interface port is configured as active.
Problem High collision rate on the hub.
Solution Disconnect connections one at a time until the problem is
localized to one computer and troubleshoot further.
Unable to Ping Through Appliance—No Connectivity
Between Ports
This section covers connectivity issues that are isolated within an IP390
appliance or network.
Localize the problem by issuing pings to various network interfaces. Use
tcpdump to help isolate the problem. Use tcpdump to verify that a packet is
leaving or entering a port.
Problem Interfaces not up.
Solution Ensure that all interfaces are up and active, as described in
Chapter 3, "Performing the Initial Configuration."
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