DHCP Based Configuration of Mobile Node from Home Network. Hui. Deng* [China Mobile] Peny Yang [Hitachi (China) R&D Corp]
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1 DHCP Based Configuration of Mobile Node from Home Network Hui. Deng* [China Mobile] Peny Yang [Hitachi (China) R&D Corp]
2 Basic Considerations providing the host configuration parameters needed for network service from home network based on DHCPINFORM. HA may or may not support DHCP Relay function. Assumption: Mobile node has obtained a network address through some other means. Mobile node may or may not know the address of DHCP server before sending DHCPINFORM
3 v01 Changes compared with v00 The cases are added while DHCP relay is not supported by HA. Co-CoA case while DHCP server s address is unknown in MN FA-CoA case while DHCP server s address is unkonwn in MN DHCP server s address is known in MN In the cases of HA with DHCP relay function After DHCP server receives the DHCPINFORM message relayed by HA, it will send the DHCPACK message directly to MN s HoA, which can be retrieved in ciaddr of DHCPINFORM message relayed by HA. Fixed some bugs and typos.
4 Three Scenarios while DHCP relay is not supported by HA Co-CoA case FA-CoA Case Home DHCP server address known
5 MIP4 Co-CoA case (No DHCP relay in HA)
6 Message 1 IP fields (encapsulating header): Source Address = mobile node's home address Destination Address = home agent's address Protocol field: 4 (IP in IP) IP fields (original header): Source Address = mobile node's home address Destination Address = broadcast address (all 1) UDP Src Port: bootpc(68), Dst Port: bootps(67) Bootstrap Protocol: field: ciaddr = mobile node's home address chaddr = mobile node's MAC address options: option 53: DHCP Message Type = DHCPINFORM option 61: Client Identifier = mobile node's MAC address option 55: Parameter request List (Domain Name Server,... et al.)
7 Message 2 DHCPINFORM Packet format forwarded by the home agent: IP fields: Source Address = MN s home address Destination Address = broadcast address (all 1) UDP Src Port: bootps(68), Dst Port: bootps(67) Bootstrap Protocol: field: giaddr = 0 ciaddr = mobile node's home address
8 Message 3 IP fields: Source Address = DHCP server's address Destination Address = HoA of MN (from ciaddr' of DHCPINFORM) UDP Src Port: bootps(67), Dst Port: bootps(68) Bootstrap Protocol: field: op = BOOTREPLY xid = same as "xid" field of DHCPINFORM message ciaddr = mobile node's home address (from 'ciaddr' of DHCPINFORM) giaddr = from 'giaddr' of DHCPINFORM received by DHCP server chaddr = mobile node's MAC address (from 'chaddr' of DHCPINFORM) options: option 53: DHCP Message Type = DHCPACK option 61: Server Identifier = DHCP server's MAC address option 6: Domain Name Server
9 Message 4 DHCPACK Packet format forwarded by the home agent: IP fields (encapsulating header): Source Address = home agent's address Destination Address = mobile node's care-of-address Protocol field: 4 (IP in IP) IP fields (original header): Source Address = DHCP server's address Destination Address = mobile node's home address UDP Src Port: bootps(67), Dst Port: bootpc(68) Bootstrap Protocol
10 MIP4 FA-CoA case and sequence
11 Message 1 IP fields (encapsulating header): Source Address = mobile node's home address Destination Address = foreign agent's address Protocol field: 4 (IP in IP) IP fields (original header): Source Address = mobile node's home address Destination Address = broadcast address (all 1) UDP Src Port: bootpc(68), Dst Port: bootps(67) Bootstrap Protocol: field: op = BOOTREQUEST ciaddr = mobile node's home address chaddr = mobile node's MAC address options: option 53: DHCP Message Type = DHCPINFORM option 61: Client Identifier = mobile node's MAC address
12 Message 2 IP fields (encapsulating header): Source Address = foreign agent's care-of-address Destination Address = home agent's address Protocol field: 4 (IP in IP) IP fields (original header): Source Address = mobile node's home address Destination Address = broadcast address UDP Src Port: bootpc(68), Dst Port: bootps(67) Bootstrap Protocol
13 Message 3 IP fields: Source Address = MN s home address Destination Address = broadcast address (all 1) UDP Src Port: bootps(68), Dst Port: bootps(67) Bootstrap Protocol: field: giaddr = 0
14 Message 4 IP fields: Source Address = DHCP server's address Destination Address = MN s home address (from ciaddr' of DHCPINFORM) UDP Src Port: bootps(67), Dst Port: bootps(68) Bootstrap Protocol: field: op = BOOTREPLY xid = same as "xid" field of DHCPINFORM message ciaddr = mobile node's home address (from 'ciaddr' of DHCPINFORM) giaddr = from 'giaddr' of DHCPINFORM received by DHCP server chaddr = mobile node's MAC address (from 'chaddr' of DHCPINFORM) options: option 53: DHCP Message Type = DHCPACK
15 Message 5 IP fields (encapsulating header): Source Address = home agent's address Destination Address = foreign agent's care-of-address Protocol field: 4 (IP in IP) IP fields (original header): Source Address = DHCP server's address Destination Address = mobile node's home address UDP Src Port: bootps(67), Dst Port: bootpc(68) Bootstrap Protocol
16 Message 6 IP fields (encapsulating header): Source Address = foreign agent's address Destination Address = mobile node's home address Protocol field: 4 (IP in IP) IP fields (original header): Source Address = DHCP server's address Destination Address = mobile node's home address UDP Src Port: bootps(67), Dst Port: bootpc(68) Bootstrap Protocol
17 Message 3 of Co-CoA case while HA has DHCP relay function (DHCPACK from DHCP server to MN) IP fields: Source Address = DHCP server's address Destination Address = MN s home address (from ciaddr' of DHCPINFORM) UDP Src Port: bootps(67), Dst Port: bootps(68) Bootstrap Protocol: field: op = BOOTREPLY xid = same as "xid" field of DHCPINFORM message ciaddr = mobile node's home address (from 'ciaddr' of DHCPINFORM) giaddr = home agent's address (from 'giaddr' of DHCPINFORM) chaddr = mobile node's MAC address (from 'chaddr' of DHCPINFORM) options: option 53: DHCP Message Type = DHCPACK option 61: Server Identifier = DHCP server's MAC address option 6: Domain Name Server
18 Message 4 of FA-CoA case while HA has DHCP relay function (DHCPACK from DHCP server to MN) IP fields: Source Address = DHCP server's address Destination Address = MN s home address (from ciaddr' of DHCPINFORM) UDP Src Port: bootps(67), Dst Port: bootps(68) Bootstrap Protocol: field: op = BOOTREPLY xid = same as "xid" field of DHCPINFORM message ciaddr = mobile node's home address (from 'ciaddr' of DHCPINFORM) giaddr = home agent's address (from 'giaddr' of DHCPINFORM) chaddr = mobile node's MAC address (from 'chaddr' of DHCPINFORM) options: option 53: DHCP Message Type = DHCPACK
19 Comments? Work item?
DHCP Based Configuration of Mobile Node from Home Network. Hui. Deng [China Mobile]
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