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Is it possible to create a run another custom dhcp service on different UDP port.

For example port 70 and 71?

Therefore all my clients pre-configured to accept this instruction and if fails fall back to official dhcp port?

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What are the client systems? – Shane Madden May 23 '12 at 5:55

ISC dhcpd and dhclient both accept -p options to use a different port number (you'd have to check that all the clients you use support this). You would need to implement the fallback yourself though (i.e. create a wrapper script which launches dhclient on the custom port and then launches it on the standard port if it doesn't get a lease).

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thank you, I will check it right now – c2h2 May 23 '12 at 6:11

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