In dhcpcd, there is an option -T which is declared that:"Test case, when dhcpcd goes through the DHCP negotiation sequence but doesn't actually configure the interface."

I would like to do the same behavior with dhclient. Does anyone knows if there is any way to do that with dhclient?


The documentation is not 100% clear, but the dhclient -n option may do what you want (from dhclient(8)):

-n Do not configure any interfaces. Most useful combined with the -w option.

If that doesn't work, I can't see any other option than using dhcpcd for testing.

  • I had tried using -n option : dhclient -n eth0 , however it doesn't work. It just print out the usage. Thanks for you answer. – nick Jul 14 '15 at 10:12
  • @nick Which version of dhclient are you using? – mjturner Jul 14 '15 at 10:13
  • This is my dhclient version: Internet Systems Consortium DHCP Client 4.2.6 – nick Jul 14 '15 at 10:17
  • Actually, -n option can only work without any interface specified. Looks like no thing equivalence for the command 'dhcpcd -T eth0' :( – nick Jul 14 '15 at 10:49

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