DHCP steps

[Isos]

Can anyone tell me about the 4 steps a DHCP server goes through in assigning an IP address

 

[vbrocks]

1. IP lease discover - 0.0.0.0 source addr, client broadcasts to 255.255.255.255 looking for dhcp server.
2. IP lease Offer - The listening DHCP server sends a broadcast of an offer of an IP address from the pool.
3. IP lease request - client sends a broadcast of the accepted offer and includes DHCP server IP in packet for the server that is supplying the address.DHCPREQUEST
4. IP lease acknowledgement - The DHCP server with the accepted offer broadcasts an acknowledgement to the client.
DHCPACK

 

[RichGK]

I'd just to add that if the client previously had an address allocated (and it is still cached), it will request that same address again in the DHCPREQUEST of step 3.

I think that is worth adding as it confused me for a while!