Determining Ethernet Link Speed

Determining Ethernet link speed is an important part of troubleshooting connectivity.  Below are examples for OS X and Linux.

Check public IP from CLI

To check the public IP address of your system or server, you could use the following command:

curl http://ifconfig.me/

The output example is below:

b1:~ oneiric$ curl http://ifconfig.me/
199.193.209.15
b1:~ oneiric$

Recursive md5sum

To create a md5sum of all files within multiple subdirectories, run this command:

find /path/to/files -type f -exec md5sum {} \;

Dell PowerConnect 5548 Auto Negotation

The Dell PowerConnect 5548 switch with firmware 4.1.0.1  does not work with auto negotiate enabled on some Mac and other NICs.

The issue seems to be with the support for Green Ethernet.  Here is the fix that worked for me:

5548-SW01(config)# no eee enable

As soon as commiting the change, the interface for the Mac systems came online.

The Mac ethernet ports need to be set to manual in order to access the switch without making the “no eee enable” config change.

MESS

Come join us at MESS

Media & Entertainment Scientific Storage http://meetu.ps/fKkqx