DHCP Option for Proxy Server

1
DHCP Option for Proxy Server

• Vijayabhaskar A K
• DHC WG
• IETF 59
• Seoul

2
DHCP Option for Proxy Server

• Configures proxy server addresses and their ports
  in the nodes
• Each sub option carries the list of proxy server
  addresses and their corresponding ports
• Ready for last call?

3
Extended Remote Boot Options for DHCPv4

• Vijayabhaskar A K
• DHC WG
• IETF 59
• Seoul

4
Requirements

• More than one TFTP server is needed in the case
  of high availability
• In many cases, the nodes need to obtain multiple
  files. TFTP usage in the remote installation is a
  typical case.
• Multiple levels of encapsulation is needed for
  coupling TFTP server addresses and the associated
  file names.

5
Option format

• The format of the Remote Boot Option is as shown
  below
• Code Len Extended Remote Boot
  Information Field
• --------------------------------------
  -...-------
• TBD N r1 r2 r3 r4
  rN
• --------------------------------------
  -...-------
• Each and every field in this option will have
• Code Len Remote Boot Information Field
• ---------------------------------------...-
  ------
• 1 N ts f1 f2 f3
  fN
• ---------------------------------------...-
  ------
• ts will be either TFTP server address/name.
  f1 to fn will be the list of filenames.
• Ready to last call?

6
Remote Boot support in DHCPv6

• Vijayabhaskar A K
• DHC WG
• IETF 59
• Seoul

7
Remote Boot Support in DHCPv6

• Requirement Same as Extended Remote boot option
  for DHCPv4
• Option format Same as its DHCPv4 equivalent.
• Ready for last call?

8
Configured Tunnel Endpoint Option for DHCPv6

• Vijayabhaskar A K
• DHC WG
• IETF 59
• Seoul

9
Usable Scenario

• This option will be used by the v4/v6 router to
  know about the list of tunnel end points it is
  connected through IPv4.

10
Option format

• 0 1 2
  3
• 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
  2 3 4 5 6 7 8 9 0 1
• ----------------------
  ----------
• OPTION_CTEP
  option-len
• ----------------------
  ----------
• prefix-len
  
• ---------
  
• 
  
• Destination Prefix (16
  bytes)
• 
  
• -------------
  ----------
• 
  
• ---------
  
• Configured TEP Address (16
  bytes)
• 
  
• -------------
  ----------
• prefix-len
  
• -----------------
  
• 
  

11
Multicast Reconfiguration Protocol for Stateless
DHCPv6

• Vijayabhaskar A K
• DHC WG
• IETF 59
• Seoul

12
Overview

• Make use of the RAs to notify the clients in the
  renumbered link about the configuration change.
  -gt A new option has been defined in ICMPv6
• Server initiates the relay to trigger RAs in the
  clients link which will in-turn trigger the
  clients to contact the server to obtain the
  updated information

13
Server Behavior

• Server sends the Relay-repl message to the Relay
  attached to the clients link with peer-addr as
  and the encapsulated reconfigure message will
  have an unique xid
• It may include Interface-id option
• The server will retransmit the relay-repl message
  till it receives DHCP Reply from the relay

14
Relay Client Behavior

• When the relay receives a Relay-repl message
  which identifies one of its link and has an
  unspecified address in peer-addr field, it does
• Triggers the router to send RA with an option
  which carries the xid copied from encapsulated
  reconfigure message from the server and makes the
  clients to contact the server to obtain the
  updated information
• May maintain xid cache
• There is no change in the clients behavior

15
Assumption

• The Relay resides in the same machine as router
• Even it doesnt coexist, the relay should be able
  to trigger RAs but with default router flag
  disabled
• This protocol doesnt work in the absence of IPv6
  router in the link

16
Advantages

• This mechanism can be further extended to be used
  in stateful DHCPv6, thus it can increase the
  performance.
• This can override the need of RAs sending service
  parameters/addresses.

17
Security considerations

• SEND can be used to secure the RAs.
• Server Relay communication will be secured by
  IPSec as per RFC 3315

18
Related Work

• The related work on this draft can be found in
• http//www.ietf.org/internet-drafts/draft-chown-dh
  c-stateless-dhcpv6-renumbering-00.txt
• http//ietf.org/internet-drafts/draft-vijay-dhc-dh
  cpv6-mcast-reconf-00.txt