If dhclient should listen and transmit on a port other than the standard (port 68), the -p flag may used. It should be followed by the udp port number that dhclient should use. This is mostly useful for debugging purposes. If the -p flag is specified, the client will transmit responses to servers at a port number that is one less than the one specified - i.e., if you specify -p 68, then the client will listen on port 68 and transmit to port 67. Datagrams that must go through relay agents are sent to the port number specified with the -p flag - if you wish to use alternate port numbers, you must configure any relay agents you are using to use the same alternate port numbers.
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