28

Troubleshooting

Cat5E and Cat6 cable are the best cabling for
the iPBridge.
2 Verify the IP address, subnet mask, and
gateway are properly set on each data port on
the iPBridge for your network environment.
Refer to ATTO ExpressNAV interface on page
19.
3 Verify that the Ethernet speed is set to auto:
check the Ethernet page of the ATTO
ExpressNAV interface, or check the LED link
lights to determine if the Ethernet speed is
correct. Refer to Visually inspect LEDs on page
25.
4 Determine if the iPBridge is set to get its IP
information from a DHCP server. If so, verify
that the DHCP server has available IP
addresses. Refer to Getting an IP address on
page 10.
5 Verify that each used Ethernet port on the
iPBridge can be pinged from the desired host.
Refer to Ping on page 45.
If the host cannot ping the iPBridge ports and
the iPBridge ports are properly configured,
continue to the Local Area Network/Wide Area
Network section, Checking the LAN/WAN on
page 28.
Verify that each port on the iPBridge can ping
each desired host. Refer to Ping on page 45. If
the iPBridge cannot ping the host, continue to
Checking the LAN/WAN on page 28.
6 If using DHCP (the default), verify that the
DHCP server is assigning the correct IP
information to the host.
7 Verify VLAN IDs are either disabled or are set
up identically on the iPBridge and the
connecting switch.
8 Some older switches/hosts cannot auto
negotiate between the iPBridge and the
switch/host at the desired speed. You may
have to force the host/switch or the iPBridge to
the desired speed.
9 Verify that the host is logging into the iPBridge
correctly by viewing the Connections page
and determining if there a “session open”
status.
10 Verify that you are using the correct login
procedure for your initiator. For example: When
connecting using the Adaptec initiator, the log
on screen requests the iPBridge iqn (iSCSI
qualified name). If left blank, Adaptec will not be
able to log in. Enter “iSCSI” into this field for
auto iqn discovery.

When changing any setting on the iPBridge, the

configuration must be saved by clicking on the

Save

button on the ATTO ExpressNAV interface screen or

using the

saveConfiguration

CLI command.

Checking the LAN/WAN
1 Verify that the switch/switches are segmented
properly so that hosts and the iPBridge have
access to each other.
2 If there are routers involved in the setup, make
sure the IP addresses and/or MAC addresses
of the iPBridge are allowed through the router.
3 Verify that the switch can see the iPBridge on
the port(s) in question. Refer to your switch
vendor’s guide for more information.
Checking the iSCSI Host Adapter or NIC

iSCSI host adapters appear as a type of Storage

Controller to the host OS, not as a standard NIC. These

adapters usually have hardware acceleration to offload

the TCP processing from the host. Configuration of

these adapters is usually done through the vendor’s

own utility and not through the OS itself.

NICs come in two types: accelerated and un-

accelerated. Accelerated NICs use some hardware to

offload some of the TCP processing from the host. Un-

accelerated NICs make the OS do all TCP processing.

To check the iSCSI host adapter or NIC

1 Check cable integrity. Check the cables for
solid connections. Make sure they are plugged
in properly. Inspect cable ends for broken clips
and improper wiring.
2 Verify that the iSCSI host adapter or NIC is
configured with the correct IP information.
3 If using DHCP, verify that the DHCP server is
assigning the correct IP information to the host.
4 Verify that the hosts are running the
recommended driver and firmware level for the
iSCSI host adapter or NIC vendor.
5 Verify that the hosts and the iPBridge are using
the same port number to communicate iSCSI.
check the ATTO ExpressNAV iSCSI page. The
default port number for the iPBridge is 3260.
6 Make sure the host adapter/NIC is configured
to log into the iPBridge. Some iSCSI host
adapters do not re-login upon reboot or
unplug/replug event without marking a check
box.