[AfrIPv6-Discuss] AfrIPv6-Discuss ISC-DHCPv6

[Stephen Honlue]

On 6/13/16 7:17 PM, Nishal Goburdhan wrote:
> On 13 Jun 2016, at 15:29, Stephen Honlue wrote:
>
>> Hi Dick,
>>
>> The DHCP configuration looks ok.
>> You should:
>>
>> - Make sure you have two interfaces(You can use sub-interfaces) of your
>> server belonging each to the appropriate Vlan.
>> - Make sure each interface(sub-interface) should have an IP address
>> withing the correct subnet(DHCP will only give IPs out of an interface
>> that has an IP withing a defined subnet).
>
> is this really true?  
In his case, he has two subnets:

#1 subnet6 2001:43f8:2a0:4::/64 {

     range6 2001:43f8:2a0:4:2::1 2001:43f8:2a0:4:2::ffff;

}

#2 subnet6 2001:43f8:2a0:d::/64 {

      range6 2001:43f8:2a0:d:13::1 2001:43f8:2a0:d:13::ffff;

}


ISC needs to know out of which interface should IPs from a specific
subnet be given out, therefore, the server requires to have an interface
configured with an IPv6 address out of the defined subnet.

> i haven’t used ISC’s dhcpd in a few years, but the above two are (or,
> were) not requirements for dhcpd for ipv4, since you could easily
> configure a relay-agent.
In this case, the agent will be the one to be able to talk to both vlans.
> it would seem odd to me that these are now requirements for v6, and a
> quick read through seems to indicate that there is indeed dhcp relay
> support (in which case your dhcp server does not need to be directly
> connected to each network), 
Yes you are right, the above declaration, is considering the fact a
relay is not being used.
> as long as the dhcpd server config, has the necessary stanzas for each
> network.
>
>
>> - Make sure your hosts seat in the appropriate vlan so that they can
>> send DHCP requests to the right interface.d
>>
>> Can you please share the physical topology with us?
>
> that could be useful;  debug messages from the server would also be
> useful too.
>
> i’d suggest checking that your native/untagged vlan on the switch
> matches what you expect to send;  while setting up for the recent AIS
> event, we ran into a similar situation, and tracked it down to config
> on an unfamiliar switch  :-)
>
> —n.
>
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