Hi, I'm doing a test on the DHCPv6 role in our 2008 R2 Enterprise server. This server sits in VLAN 100 (2e18:100::/64) and the client (Vista 32bit) is in VLAN 55 (2e18:55::/64). Apparently the hosts within the VLAN 100 are able to receive IP addresses from the DHCP server but not the VLAN 55. We are using HP Procurve 3500yl switches (dhcpv6-relay and also unicast-routing is turned on) for this test. We did notice there are requests being sent from the hosts but there are no replies from the DHCP server. A quick connectivity test shows that the switch is able to ping to the DHCP server via any of its IPv6 interfaces. Any ideas on this? Thanks in advance. Regards, Eric

Hi Eric if you assign a static ip address to a client in vlan 55, is the client machine able to ping the server in vlan 100.. IF NOT then then this could be a routing issue, make sure inter-vlan routing is configured to allow packets to move btwn the two vlans, BUT if you can ping the server in vlan100 from vlan 55 then make sure u defined the scope for vlan 55 on the dhcp server and that dhcprelay is properly configured with the the vlan 55 gateway. it should work if the above is dealt with, please run some tests and re-check your configuration and post if any progress has been made or if the issue persists tech-nique

Search online for your "HP ProCurve Switch Software IPv6 Configuration Guide" pdf which helps a bit. Goal: Switch provides clients with IPv6 adres, switch points clients to DHCPv6 server to get their DNS servers and domain prefix. Asuming most people have setup IPv6 yet on the procurve: Devicename (config)# dhcpv6-relay (see procurve ipv6 configuration guide, search: General Steps for Enabling DHCP Relay Operation ) go to the VLAN which hosts the clients Devicename (vlan-55)# no ipv6 nd ra managed-config-flag (see procurve ipv6 configuration guide, search: managed-config-flag: Controls the M-bit setting in router ) Devicename (vlan-55)# ipv6 nd ra other-config-flag (see procurve ipv6 configuration guide, same search) Devicename (vlan-55)# ipv6 helper-address unicast 1111:2222:3333:4444::1 You can add more dhcp6 server addresses by repeating the command. The switch uses the one that responds first. Note: If the switch is a host and not in router mode, you need to use an option called "DHCP-full" or something like that.