Reference Guide
The table shows common options using DHCP packet formats.
Subnet mask 1 — Client’s subnet mask
Router 3 — Router IP addresses that serve as the client’s default gateway
Domain name server 6 — Domain name servers (DNS) that are available to the client
Domain name 15 — Domain name that clients use to resolve hostnames via DNS
IP address lease time 51 — Amount of time that the client can use an assigned IP address
DHCP message type 53:
• 1 — DHCPDISCOVER
• 2 — DHCPOFFER
• 3 — DHCPREQUEST
• 4 — DHCPDECLINE
• 5 — DHCPACK
• 6 — DHCPNACK
• 7 — DHCPRELEASE
• 8 — DHCPINFORM
Parameter request
list
55 — Parameters the server requires for DHCP clients. This is a series of octets where each octet is a DHCP
option code
Renewal time 58 — Amount of time, after the IP address is granted, that the client attempts to renew its lease with the original
server
Rebinding time 59 — Amount of time, after the IP address is granted, that the client attempts to renew its lease with any server, if
the original server does not respond
Vendor class
identier
60 — User-dened string the Relay Agent uses to forward DHCP client packets to a specic DHCP server
User port stacking 230 — Stacking option variable to provide DHCP server stack-port details when the DHCP oer is set.
End 255 — Signal of the last option in the DHCP packet
Congure Server
The DHCP server provides network conguration parameters to DHCP clients on request. A DHCP server dynamically allocates four
required IP parameters to each computer on the virtual local area network (VLAN) — the IP address, network mask, default gateway, and
name server address. DHCP IP address allocation works on a client/server model where the server assigns the client reusable IP
information from an address pool.
System management
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