Administrator’s Guide for Yealink Video Conferencing Systems48Configuring LAN PropertiesDHCPDHCP (Dynamic Host Configuration Protocol) is a network protocol used to dynamically allocatenetwork parameters to network hosts. The automatic allocation of network parameters to hostseases the administrative burden of maintaining an IP network. The system complies with theDHCP specifications documented in RFC 2131. DHCP by default, which allows the systemconnected to the network to become operational by obtaining IP addresses and additionalnetwork parameters from the DHCP server.DHCP OptionDHCP provides a framework for passing information to TCP/IP network devices. Network andother control information are carried in tagged data items that are stored in the options field ofthe DHCP message. The data items themselves are also called options.DHCP can be initiated by simply connecting the system to the network. The system broadcastsDISCOVER messages to request network information carried in DHCP options. The DHCP serverresponds with the specific values in the corresponding options.The following table lists the common DHCP options supported by the system.Parameter DHCP Option DescriptionSubnet Mask 1 Specifies the client’s subnet mask.Time Offset 2 Specifies the offset of the client's subnet inseconds from Coordinated Universal Time (UTC).Router 3 Specifies a list of IP addresses for routers on theclient’s subnet.Time Server 4 Specifies a list of time servers available to theclient.Domain NameServer 6 Specifies a list of domain name servers availableto the client.Log Server 7 Specifies a list of MIT-LCS UDP servers available tothe client.Host Name 12 Specifies the name of the client.Domain Server 15 Specifies the domain name that client should usewhen resolving hostnames via DNS.BroadcastAddress 28 Specifies the broadcast address in use on theclient's subnet.Network Time 42 Specifies a list of the NTP servers available to the
