January 2001
Intermediate to advanced
288 pages
7h 52m
English
Content preview from DHCP for Windows 2000
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DHCP for IPv6
DHCP for IPv6, also known as DHCPv6, enables DHCP servers to deliver configuration parameters to IPv6 hosts. As stated earlier, IPv6 hosts by default use stateless autoconfiguration unless configured otherwise. DHCPv6 represents the stateful autoconfiguration option.
Much like DHCP in IPv4, DHCPv6 uses a client/server model. The DHCP server and the DHCP client converse with a series of messages to request, offer, and lease an IP address. Unlike DHCP in IPv4, DHCPv6 uses a combination of unicast and multicast messages for the bulk of the conversation instead of broadcast messages.
Table 12.2 shows the well-known multicast addresses that are used when DHCPv6 transmits multicast messages.
Table 12-2. Well-Known Multicast Addresses and Multicast Groups
|
Multicast Group Name |
Multicast Address |
Members |
|---|---|---|
|
All-DHCP-Agents |
FF02:0:0:0:0:0:1:2 |
All DHCP servers and relay agents |
|
All-DHCP-Servers |
FF05:0:0:0:0:0:1:3 |
All DHCP servers |
|
All-DHCP-Relays |
FF05:0:0:0:0:0:1:4 |
All DHCP relay agents |
All DHCP messages being transmitted to a DHCP server are transmitted using UDP port 547. All DHCP messages being transmitted to a DHCP client are transmitted using UDP port 546.
The DHCPv6 Conversation
The following message types can be found in a DHCPv6 conversation. Notice the many similarities to the original DHCP message types.
- 01 DHCP Solicit
This message is an IP multicast message sent by a DHCP client to a DHCP server or relay agent.
- 02 DHCP Advertise
This message is an IP unicast message ...
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