War story nic swap to a different kind lessons learned

[HardTack5]

I finally got around to swapping in an i350 'igb' card from an 'em' based card

I had a few gotchas that make sense in hindsight.

I expected to swap my previous card for the i350 card. Knowing the drivers and interface names would be different I planned to connect via the servers onboard NIC I have configured for management.

I found that after swapping the em card for the igb card I could not connect to my management interface. On connecting a monitor and keyboard I realized why

Previous interfaces were em0,em1,em2 and em3 on the EM quad card. The management NIC on the motherboard had been assigned em4. However once the quad port nic em interfaces were no longer there, the management nic got allocated as em0.

My plan was to edit the config following the swap and replace mentions  of em in the config with igb. I just had to do this via a monitor and keyboard as the management nic address changing caught me out. 

Also editing the config file and replacing the nic interfaces worked well.