Transcript PPT Version
DHCPv4/v6 Proxy draft-sarikaya-dhc-proxyagent-00.txt [email protected] [email protected] IETF 67 DHC WG -- San Diego, USA 5-10 Nov. 2006 DHCP Proxy Overview • DHCP Proxy is a DHCP server but it does not do the address management • DHCPv4 Proxy • A mobile node joins the network, sends DHCPDISCOVER • Proxy finds an address and replies with DHCPOFFER • The MN sends DHCPREQUEST to get an address assigned • DHCPv6 Proxy • MN may get an address using stateless address configuration • MN contacts DHCP Proxy possibly by sending Information Request • DHCP Proxy gets the information (locally or contacting other servers) and replies with Information-Reply • In the future DHCPv6 proxy may be used for IP address allocation. Use Case-1 persistent address assignment AAA HoA HoA PMIP DHCP Internet GW+ DHCP proxy MN BTS Access Network Provider HA Core Network Provider Use Case-2 parameter configuration AAA DHCP Internet NAS+ DHCP proxy MN BTS Access Network Provider Core Network Provider Mobility Issue HO Direction AAA GW+ DHCP proxy-1 Internet HoA PMIP BTS MN GW+ DHCP proxy-2 Access Network Provider HoA HA Core Network Provider Mobility Issues • MN moves to another subnet • The DHCP client in the MS does not know about movement • How should the MN re-sync with the new DHCP proxy? • Which address the DHCP renew should be sent to? • Relying on RENEW and REBIND timers (T1 and T2) may not suffice. The timers may be too long. The MS may send repeated RENEW messages over-the-air wasting radio resource DHCP Extensions • None yet. Mailing List Discussions • Does the DHCP Proxy provide other parameters? A: Yes • Can LDAP server be used to store the parameters ? A: Yes • How to get an address by querying AAA server? A: There is a draft on this? AAA servers are normally not used for address assignment. • Who keeps the lease info? A: DHCP Proxy Feedback Needed from DHC WG • Should we assign a fixed address to DHCP Proxy? . Next Steps • Issue a revision based on the comments • What do you think about DHCP Proxy? Thank You. Questions?