draft-ietf-dhc-pv4-reconfigure-01.txt   draft-ietf-dhc-pv4-reconfigure-02.txt 
Submitted to DHC Working Group Peter De Schrijver Submitted to DHC Working Group Peter De Schrijver
INTERNET DRAFT Yves T'Joens INTERNET DRAFT Yves T'Joens
<draft-ietf-dhc-pv4-reconfigure-01.txt> Christian Hublet <draft-ietf-dhc-pv4-reconfigure-02.txt> Christian Hublet
Alcatel Alcatel
November 2000
Expires June, 2001
June 2000 DHCP reconfigure extension
Expires December 2000
Dynamic host configuration : DHCP reconfigure extension
Status of this memo Status of this memo
This document is an Internet-Draft and is in full conformance with This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026. all provisions of Section 10 of RFC2026.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
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Distribution of this memo is unlimited. Distribution of this memo is unlimited.
Abstract Abstract
This draft defines extensions to DHCP [DHCP] to allow dynamic This draft defines extensions to DHCP [DHCP] to allow dynamic
reconfiguration of a single host triggered by the DHCP server (eg. a reconfiguration of a single host triggered by the DHCP server (eg. a
new IP address). This is achieved by introducing a unicast DHCP new IP address). This is achieved by introducing a unicast DHCP
FORCERENEW message which forces the client to the RENEW state. FORCERENEW message which forces the client to the RENEW state.
skipping to change at line 106 skipping to change at page 3, line 15
+--------+ +------+ +--------+ +------+
| Init / | +-->+ Init +<---------------+-------------------+ | Init / | +-->+ Init +<---------------+-------------------+
| Reboot | | +--+---+ | | | Reboot | | +--+---+ | |
+---+----+ DHCPNAK/ -/Send DHCPDISCOVER | | +---+----+ DHCPNAK/ -/Send DHCPDISCOVER | |
| Restart | (broadcast) | | | Restart | (broadcast) | |
| | v v-------------+ | | | | v v-------------+ | |
-/Send DHCPREQUEST | +----+------+ DHCPOFFER/DHCPDECLINE | -/Send DHCPREQUEST | +----+------+ DHCPOFFER/DHCPDECLINE |
| (broadcast) | | Selecting |----------+ | | | (broadcast) | | Selecting |----------+ | |
v | +----+------+ | | v | +----+------+ | |
+---+----+ | DHCPOFFER/DHCPREQUEST | | +---+----+ | DHCPOFFER/DHCPREQUEST | |
| Reboot +--------------+ (broadcast) | | | Reboot +---------+ (broadcast) | |
+---+----+ v | | +---+----+ v | |
| +----+-------+ DHCPNAK /halt network | +----+-------+ DHCPNAK /halt network
| + Requesting | | lease expired | + Requesting | | lease expired
DHCPACK/ +----+-------+ | | DHCPACK/ +----+-------+ | |
Record lease | | | Record lease | | |
set timers DHCPACK/Record lease | | set timers DHCPACK/Record lease | |
| v Set T1 & T2 | | | v Set T1 & T2 | |
| +--+----+DHCPFORCE +---+---+ +---+----+ | +--+----+DHCPFORCE +---+---+ +----+---+
+---------------------->+ Bound +---------->+ Renew +---------->+ Rebind | +----------------->+ Bound +---------->+ Renew +--------->+ Rebind |
+--+-+--+T1 expires +-+-+---+ T2 expires+--+--+--+ +--+-+--+T1 expires +-+-+---+T2 expires+----+---+
^ /DHCPREQUEST | | /broadcast | ^ /DHCPREQUEST | | /broadcast |
DHCPACK to leasing | | DHCPREQUEST | DHCPACK to leasing | | DHCPREQUEST |
| server | | | | server | | |
+------------------------------------------+ +----------------------------------------+
4. Message layout 4. Message layout
Field DHCPFORCERENEW Field DHCPFORCERENEW
----- --------------- ----- ---------------
'op' BOOTREPLY 'op' BOOTREPLY
'htype' (From "Assigned Numbers" RFC) 'htype' (From "Assigned Numbers" RFC)
'hlen' (Hardware address length in octets) 'hlen' (Hardware address length in octets)
'hops' 0 'hops' 0
'xid' selected by server 'xid' selected by server
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'yiaddr' 0 'yiaddr' 0
'siaddr' 0 'siaddr' 0
'flags' 0 'flags' 0
'giaddr' 0 'giaddr' 0
'chaddr' client's hardware address 'chaddr' client's hardware address
'sname' 0 'sname' 0
'file' 0 'file' 0
'options' options 'options' options
DHCP option 53 (DHCP message type) is extended with a new value : DHCP option 53 (DHCP message type) is extended with a new value :
DHCPFORCERENEW (TBD)
5. Failover Considerations
A DHCP server should only send a DHCPFORCERENEW when it's fully aware DHCPFORCERENEW (TBD)
of the current state of the DHCP client. In practice this means it
should only send a DHCPFORCERENEW when in "PARTNER DOWN",
"COMMUNICATIONS INTERRUPTED" or "NORMAL" state, and only for DHCP
clients of which the state is synchronised. (see [DHCP-FAILOVER])
6. IANA Considerations 5. IANA Considerations
The new value for DHCP option 53 (DHCP message type) to indicate a The new value for DHCP option 53 (DHCP message type) to indicate a
DHCPFORCERENEW message is TBD. DHCPFORCERENEW message is TBD.
7. Security Considerations 6. Security Considerations
As in some network environments DHCPFORCERENEW can be used to snoop As in some network environments DHCPFORCERENEW can be used to snoop
and spoof traffic, the DHCPFORCERENEW message MUST be authenticated and spoof traffic, the DHCPFORCERENEW message MUST be authenticated
using a shared secret based mechanism as described in [DHCP-AUTH]. using the procedures as described in [DHCP-AUTH].
8. References 7. References
[DHCP] R.Droms, "Dynamic Host Configuration Protocol", RFC 2131, [DHCP] R.Droms, "Dynamic Host Configuration Protocol", RFC 2131,
March 1997. March 1997.
[DHCP-AUTH] R. Droms, "Authentication for DHCP Messages", draft-ietf- [DHCP-AUTH] R. Droms et al., "Authentication for DHCP Messages",
dhc-authentication-12, October 1999, Work in progress. draft-ietf-dhc-authentication-14, July 2000, Work in progress.
[DHCP-FAILOVER] R. Droms, K. Kinnear, M. Stapp, B. Volz, S. Gonczi, [RFC2119] S. Bradner, "Key words for use in RFCs to Indicate
G. Rabil, M. Dooley, A. Kapur, "DHCP Failover Protocol", draft-ietf- Requirement Levels", BCP 14, RFC 2119, March 1997.
dhc-failover-06.txt, March 2000, Work in progress.
9. Contacts 9. Contacts
Peter De Schrijver Peter De Schrijver
Alcatel Network Strategy Group Alcatel Network Strategy Group
Francis Wellesplein 1, 2018 Antwerp, Belgium Francis Wellesplein 1, 2018 Antwerp, Belgium
Phone : +32 3 240 8569 Phone : +32 3 240 8569
E-mail : peter.de_schrijver@alcatel.be E-mail : peter.de_schrijver@alcatel.be
Yves T'joens Yves T'joens
Alcatel Network Strategy Group Alcatel Network Strategy Group
Francis Wellesplein 1, 2018 Antwerp, Belgium Francis Wellesplein 1, 2018 Antwerp, Belgium
Phone : +32 3 240 7890 Phone : +32 3 240 7890
E-mail : yves.tjoens@alcatel.be E-mail : yves.tjoens@alcatel.be
Christian Hublet Christian Hublet
Alcatel Carrier Internetworking Division Alcatel Carrier Internetworking Division
De Villermontstraat 28, 2550 Kontich, Belgium De Villermontstraat 28, 2550 Kontich, Belgium
Phone : +32 3 450 3322 Phone : +32 3 450 3322
E-mail : Christian.Hublet@alcatel.be E-mail : Christian.Hublet@alcatel.be
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