Hi,

>  > Are you sure you are defining a DHCPv4 option? It seems to me
>  > you were intended to define a DHCPv6 option instead.
>  
>  I think both ways are possible.
>  
>  If defining DHCPv4 option, the router should request DHCPv4
>  messages in the configured IPv6 tunnel.

In that way, we can use DHCPv4 as is, no additional options
need inventing.

>  If defining DHCPv6 option, the router should have an global 
>  IPv4 address as well as IPv6 tunnel endpoint address at the
>  same time, and should configure IPv6 tunnel and attach IPv4
>  global address to it.
>  
>  In the former case, the router has to decide whether it uses
>  IPv4 global address or not by the reply from the DHCPv4 server
>  that may not exist in the network. It may bring up implementation
>  difficulty and also timing issue.

Yes. DS-Lite avoids IPv4 provision in the SP network, so it is hard
for us to assume a DHCPv4 server would be there.
  
>  So, as you suggest, it may be better to use DHCPv6.

;-)

Thanks,
washam
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