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On receiving a DHCP request, the DHCP server may respond with specific information for each client, as previously configured by an administrator, or with a specific address and any other information valid for the entire network and for the time period for which the allocation (lease) is valid. A DHCP client typically queries this information ...
Clients may solicit an IP address from a DHCP server when they need one. The DHCP server then offers the "lease" of an IP address to the client, which the client is free to request or ignore. If the client requests it and the server acknowledges it, then the client is permitted to use that IP address for the "lease time" specified by the server.
It has a 2-byte DUID type field, and a variable-length identifier field up to 128 bytes. Its actual length depends on its type. The server compares the DUID with its database and delivers configuration data (address, lease times, DNS servers, etc.) to the client. Four DUID types are identified: [2]: §11 Link-layer address plus time (DUID-LLT)
In computer science, a lease is a contract that gives its holder specified rights to some resource for a limited period. Because it is time-limited, a lease is an alternative to a lock for resource serialization .
The Network Time Protocol has an overflow issue related to the Year 2038 problem, which manifests itself at 06:28:16 UTC on 7 February 2036, rather than 2038. The 64-bit timestamps used by NTP consist of a 32-bit part for seconds and a 32-bit part for fractional second, giving NTP a time scale that rolls over every 2 32 seconds (136 years) and ...
Server BOOTP DHCP DHCPv6 Other Load balancing Failover dhcpy6d No No Yes PXE, Dynamic DNS: Yes Yes dnsmasq Yes Yes Yes PXE, TFTP: No No ISC DHCP Yes Yes Yes Dynamic DNS [10] [11] ...
IEEE Reverse Address and Port Translation (RAPT or RAT) allows a host whose real IP address changes from time to time to remain reachable as a server via a fixed home IP address. [16] Cisco's RAPT implementation is PAT or NAT overloading and maps multiple private IP addresses to a single public IP address. Multiple addresses can be mapped to a ...
In a DHCP starvation attack, once the adversary receives the IP address and the lease period from the DHCP server, the adversary does not respond with the confirmation. Instead, the adversary floods the DHCP server with IP address requests until all addresses within the server's address space have been reserved (exhausted).