[lwip-devel] RE: IPv6 development status

[Ivan Delamer]

Bill,

Mapping IPv6 addresses to IPv4 addresses is an interesting v6 transition
approach, however this suggests that LwIP should be a native IPv6 stack
with legacy support for IPv4. I don't think this is what most users would
like, so I think we need to find a different approach to coexistence.

Another interesting feature of IPv6 is that an interface can (and usually
does) have multiple addresses. I think that any implementation should
allow for a variable number of addresses, and that if IPv6 is disabled at
compile time, it shouldn't have an impact on memory use e.g. of a netif
struct.

Cheers
Ivan


> Date: Mon, 25 Oct 2010 08:43:56 -0400
> From: "Bill Auerbach" <address@hidden>
> Subject: RE: [lwip-devel] IPv6 development status
> To: <address@hidden>, "'lwip-devel'"
>       <address@hidden>
> Message-ID: <address@hidden>
> Content-Type: text/plain;     charset="iso-8859-1"
>
> This is interesting - I wonder how it impacts size and performance:
>
> IP Addresses
>
> LwIPv6 can handle both IPv4 and IPv6 packets, but internally, every data
> structure stores IP addresses in the IPv6 (128 bit) format: IPv4 addresses
> are converted in the IPv4-Mapped IPv6 format; IPv6 are stored unchanged.
> Network netmasks are converted in the 128 bit format too, but the first 80
> bit are set to 1. For example, the netmask 255.255.255.0 (0xffffff00), is
> converted in the following 128 bit netmask
> 0xfffffff.ffffffff.ffffffff.ffffFFFF.ffffff00.
>
> Bill
>
>>-----Original Message-----
>>From: address@hidden
>>[mailto:address@hidden On
>>Behalf Of Frédéric BERNON
>>Sent: Friday, October 22, 2010 2:28 PM
>>To: Ivan Delamer; lwip-devel
>>Subject: Re: [lwip-devel] IPv6 development status
>>
>>
>>  Perhaps take a look to this link :
>>http://wiki.virtualsquare.org/wiki/index.php/LWIPV6
>>
>>I think this is a "non official" branch of lwIP maintained by another
>>group.
>>
>>Good luck :)
>>
>>
>>_______________________________________________
>>lwip-devel mailing list
>>address@hidden
>>http://lists.nongnu.org/mailman/listinfo/lwip-devel
>
>
>
>
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