ClearCube I/Port Users Guide - Manual (Page 45)

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Appendix B. Troubleshooting
This appendix provides troubleshooting information for the I9420 I/Port.
The I9420 I/Port is connected to a 100/full-duplex switch but performance is
poor and throughput is not full-duplex.
To ensure 100/full-duplex throughput between a V5120 card in a blade and an I9420 I/Port, set
any network switches connecting the blade and the I/Port to automatic negotiation. Explicitly
setting a network switch to 100/full-duplex can cause throughput issues. If there are
performance or throughput issues after setting network switches to automatic negotiation,
physically disconnect and then reconnect the network cables to the switch.
The I9420 I/Port does not connect to a blade when I disable DHCP or change the
IP address of the I/Port’s V5120 Dual Hostcard.
The I9420 and the V5120 Dual Host card that it contains have DHCP connection mode
enabled by default. If a DHCP address is not granted within 20 seconds of starting the I/Port,
each device defaults to the following static IP addresses:
• I9420—192.168.1.100
• V5120—192.168.1.101
Each device has a Web page interface that you can use to:
• Enable and disable DHCP connection mode.
• Specify static IP addresses for the subnet and default gateway.
If you disable the I/Port's DHCP setting, the I/Port cannot connect to a blade if the I/Port's
static IP address and default gateway are on different subnets.
Resolution
If the devices are on a know subnet, you can discover a specific device to display the device's
IP and MAC address.
To prevent this issue:
• Avoid disabling the I/Port's DHCP setting.
• If you specify a static IP address for the V5120, ensure that you record it.
• Ensure that the I/Port's IP address and default gateway are on the same subnet.