DHCPv4/v6 Proxy IETF 67 DHC WG -- San Diego, USA 5-10 Nov draft-sarikaya-dhc-proxyagent-00.txt

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 BTS GW+ DHCP proxy HA AAA DHCP PMIP Core Network Provider Access Network Provider HoA Internet HoA MN

Use Case-2 parameter configuration BTS NAS+ DHCP proxy AAA DHCP Core Network Provider Access Network Provider Internet MN

Mobility Issue BTS GW+ DHCP proxy-2 HA AAA PMIP Core Network Provider Access Network Provider HoA Internet HoA MN GW+ DHCP proxy-1 HO Direction

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?.

Issue a revision based on the comments What do you think about DHCP Proxy? Next Steps

Thank You. Questions?