Hi,
> 1. What is the use of having separate Link-Local Unicast address and
> Site-Local Unicast address, when nodes can communicate ( on a link or
> in a site) by using Aggregatable Global Unicast Addresses.
Your question is about the scope.
- The link-local address is valid only on a link. But it's an address
which is autoconfigurable (First step of Stateless Autoconfguration).
It allows a host to determine an address and have at least one. For
example, DHCP client uses only link-local addresses to get another
address.
- Site-local are like 'private IPv4 address'. They can be used if you
want to have private addresses.
You have to use NAT for example to toggle public addresses and
site-local addresses.
- Aggregatable global adrresses are global adresses. They contain TLA,
SLA, ...
It's a public addresses which will be given by an ISPs for example.
>> 2. What is the use of IPv4-mapped IPv6 addresses and IPv4-compatible
IPv6 addresses? Where can I get information about this?
Generally, IPv4-mapped IPv6 address is used when a V6 node wants to
communicate with a V4-only node.
I think you can look at ngtrans rfc and drafts that talks about
translator. SIIT is a good example.
The use of IPv4-compatible IPv6 addresses are used to establish
tunnels. When a IPv6 node wants to communicate over IPv4, it uses
IPv4-compatibke addresses. This address type is usefull to indicate for
example the tunnel endpoint.
Ex under Linux: $> route -Ainet6 3ffe:/16 gw ::192.168.52.1
To reach 3ffe:/16, you have to encapsulate your packet into a IPv4 one.
For all the previous question, have a look at RFC 2373 and NGTRANS RFC
and draft.
Regards,
Gilles Diribarne
--
Gilles Diribarne
Alcatel Research & Innovation
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Tel: +33 (0)1 69 63 46 45 Fax: +33 (0)1 69 63 11 69
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