Is there any way to detect full DHCP pool just from DHCP traffic?? I assume for simplicity just one DHCP server in network. I have found in RFC 2131, that DHCP NAK is sent only in this case:
Server to client indicating client's notion of network address is incorrect (e.g., client has moved to new subnet) or client's lease as expired.
So I suppose DHCP NAK is not sent, when DHCP pool is full. But definitely it goes with full DHCP pool. I have also found in this topic
If a DHCP server's scope is full, it won't reply with a DHCPOffer...
So I think when DHCP pool is full, clients will retransmit many DHCP DISCOVER, because of retransmitting algorithm defined in RFC 2131. I don't see better way to detect full DHCP pool from DHCP traffic. If anyone have better idea to detect it just from sent packets I would be really glad. Thanks in advance.