Re: Question on IPv6 over IB

On Thu, 13 Jan 2005, Roland Dreier wrote:

>     Anand> However, if you look at the linux ipv6 ndisc
>     Anand> implementation, the pad is "appended" to the 20-byte
>     Anand> hardware address for infiniband and not "prepended". Could
>     Anand> someone comment on this?
>  
> Yes, it seems the Linux stack assumes that all link address types
> behave the same way as RFC 2464 IPv6-over-Ethernet, namely that
> padding in the ndisc option comes at the end of the link address.  If

Isn't the length of the option already 8 when used on Ethernet (type+length+
48bit)? Then it wouldn't require the padding.

> I'm reading the code in FreeBSD's nd6_ns_output() correctly, it makes
> the same assumption.
> 
> It would seem to make the most sense to update the IPoIB draft to
> state that link address padding goes at the end of the ndisc option.

Will it not align the local address at 2 byte boundary as against 4?

> 
>  - Roland
> 
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