Robin at yo61.com found a great and handy way to discover the MAC addresses of the embedded NICs of your Dell (PowerEdge) servers. Instead of going through DRAC, logging in, starting Java, etc. you can also get the same using the RAC command line interface: racadm racdump. Read the article on yo61.com for complete details. Excellent! If only I could find a similar command for my 500 PE2950 servers with DRAC5...
Just found a great tip to prevent timeouts of PuTTY sessions. I'm fine with timeouts by the host, but in our case the firewall kills sessions after 30 minutes of inactivity... When using PuTTY to ssh to your Linux/Unix servers, be sure to use the feature to send NULL packets to prevent a timeout. I've set it to once every 900 seconds, i.e. 15 minutes... See screenshot on the right.
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