Troubleshoot DHCP

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Article under construction currently. Below you will find notes that are being collected to eventually organize into a nice article.

Failed to get an IP via DHCP!

Sending discover… actually means that a network interface was found and try to get an IP for it via DHCP. So it could be:

  • Layer 1 issue like cable (you already checked that)
  • Spanning tree issue (make sure you have RSTP or configured “port fast”)
  • Auto-negotiation issue (try configuring static speed instead of auto-negotiation for that port)
  • Ethernet energy saving (see if your switch has EEE/802.3az feature and disable if possible)