Re: [dhcwg] Question on Relay address field

["Anil Kumar Reddy. S" <[e-mail]>]

Hi Jim,

    As per IPv6 rfc2292bis (draft), through the socket option IPV6_RECVPKTINFO
    we can get the index of the interface through which the client packet is
    received. But the index will be same for all aliases and the
    primary address of the interface. So, if we get the interface index
    and try to get the address of that, then we get the link local address only

    because the primary address of an interface is always link local.
    (  Hope, I am clear in explaining   ;-))  )

    In this case, how the relay is expected to work, when an interface
    is configured with the addresses given by Vijay ?? Which address it has
    to consider ??

- Anil

Jim Bound wrote:

> Vijay,
>
> I am not clear why you can't tell the alias.  This will be a function of
> the scoping code for IPv6 as the interface in your example is using
> scoping (your aliases) and that is code that would have to be part of the
> base IPv6 stack to return from the API index routines?
>
> I am not clear this is a dhcp problem but an IPv6 implementation problem
> in general we all are working on now?
>
> Maybe I am missing your issue though?
>
> thanks
>
> /jim
>
> On Fri, 21 Sep 2001, Vijay Bhaskar A K wrote:
>
> > The latest draft on DHCPv6 says that, the client sends the
> > request to All Agents multicast address. The Agents put its
> > own address of the interface in which the client packet is
> > recieved, in the Relay-forward packet.
> >
> > Assume the configuration one of the interface of the Agent is as follows.
> >
> > lan0   -  A link local address
> > lan0:1 -  A site local address
> > lan0:2 -  A gloabal address
> >
> > Assume the packet is received from the client in the lan0 interface of the
> > agent.
> > Using our latest IPv6 APIs, we can identify this.
> > But, we CANT identify at what alias interface ( lan0 or lan0:1 or lan0:2)
> > in which the packet is received.
> >
> > Here the problem is, the relay cannot put its own link local address
> > in the relay address field in the relay forward packet, since this
> > info is useless.
> >
> > The question, SHOULD the relay put the address in lan0:1 (site local
> > address) or lan0:2 (global address)in the relay address field?
> > The DECISION of the relay is very important that depending up on the
> > address it is sending the relay address field only, the server can
> > allocate address to the client. Is there any solution to this
> > problem?
> > ~Vijay
> >
> >
> >
> > ____Vijay_Bhaskar_A_K____
> > ______Inet_Services______
> > ________HP_ISO___________
> > _____Phone:_2051424______
> > ___Pager:_9624_371137____
> >
> >
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> >
>
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|  Anil Kumar Reddy .S
|  Senior Software Engineer,
|  Hewlett-Packard,
|  Bangalore, INDIA.
|
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