dhcp server and client mac addresses

[sarahr202]

Hi everybody.

I am back with another weird scenario.

Suppose we have the following set up.

h1--------dhcp server

h1 has  a mac address: mac1.

Dhcp server has following entry:

199.199.199.1-----> mac1

Let say host h1 is a rogue host. Using an application, h1 sends another dhcp discover message again using the same mac address mac1.

Will dhcp server  assign yet another ip address to host1 even though it has already assigned 199.199.199.1 to h1? ie

199.199.199.1----> mac1( previously assigned)

199.199.199.2-----> mac 1           

or Will dhcp server simply ignore the dhcp discover message because dhcp checks its bindings database and concludes  mac1 has already been assigned 199.199.199.1?

thanks and have a great day.

[cadet alain · Accepted solution]

Hi,

the server already has a binding for this MAC so it won't send an OFFER to the client, the rogue application would have to send  a DISCOVER with a fake MAC to get the other IP.

Regards.

Alain

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[sarahr202]

thanks Alain