Dell Brocade Adapters - Manual (Page 59)

Brocade Adapters Troubleshooting Guide 35
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Network interface problems (CNA or NIC)
2
• Administratively up, but link is down. Running the Linux or VMware ifconfig command
shows that the RUNNING flag is not set.
Action: To determine link state, run the ifconfig command for Linux or VMware systems. For
Windows systems, run ipconfig /all or use Settings > Network Connections.
Action: For the interface to send and receive packets, both the UP and RUNNING flags must be
set.
Action: If pinging a server on a different network. make sure that the route to that host network
or that the default gateway is correctly configured.
2. Possible Cause: Other link problems.
Action: Refer to “Port link is not active” on page 10.
3. Possible Cause: IP address and network mask of adapter port are set incorrectly.
Action: Verify and set IP address and network mask if necessary.
• Linux - Run the ifconfig command to determine if port has proper IP address and network
mask and to verify that the link is up.
• Windows - Use Device Manager and network connection tools.
4. Possible Cause: Packets are not being received or stack is dropping packets at remote server
due to incorrect IP address set on adapter or incorrect MTU size.
Action: Verify if packets arrived at the remote server using the following commands:
• Linux - Run the tcpdump command.
• Windows - Run the Wireshark application.
Action: Verify MTU size on your system and increase size if necessary. Note that MTU size set
on adapter must not be more than MTU size set on attached FCoE switch. To set MTU size on
the adapter, refer to the “Adapter Configuration” Chapter in the Brocade Adapters Installation
and Reference Manual.
Action: Verify and set IP address and network mask if necessary.
• Linux - Run the ifconfig command to determine if port has proper IP address and network
mask and to verify that the link is up.
• Windows - Use Device Manager and network connection tools.
5. Possible Cause: If hosts with Windows operating systems do not reply to broadcast/multicast
ICMP ping commands, this is by design. Windows systems will not reply for security reasons.
Action: Refer to Windows KB137421 on http://support.microsoft.com/kb/137421 .
Receive-side scaling disables unexpectedly
Receive-side scaling (RSS) is unexpectedly disabled on Windows Server 2008 systems.
Possible Cause: Windows hotfix KB958015 is not installed.
Action: Download and install hotfix KB958015. This hotfix is recommended.