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IPv4-mapped IPv6 addresses

-----Original Message-----
From: Julio Baixauli <[email protected]>
Date: Mon, 18 Dec 2000 14:13:42 +0100
To: 6bone <[email protected]>
Subject: IPv4-mapped IPv6 addresses

> 	Hello!
> 	I need an explanation about IPv4-mapped addresses... 
> 	I'm programming a client application for test purposes. Basically, I
> open a socket and connect that socket to an IPv6 address. Next, I read
> characters from that socket.
> 	There is no problems when I try to connect to global-scope addresses,
> like 3ffe:XXXXXXXXXX. In this cases I can connect.
> 	The problem comes when I try to connect to IPv4-mapped addresses. In
> this cases connect returns 'no route to host' or 'network is
> unreachable'. This is false!! because I add a route to IPv4-mapped
> addresses, and when I ping these addresses I can see, at least, ICMP
> Neighbor Solicitation, for the gateway, on the net.

I built my IPv6 client/server using IPv4-mapped IPv6 address, address format like ::ffff:a.b.c.d  

These two hosts were on the same Ethernet. 


> 	So... what's failing?
> 	Do kernel any diferences between raw-sockets (ping) and stream-sockets
> (tcp)?
> 	Are there any implications with IPv4-mapped addresses?
> 	I've no idea about what happens...
> 	Thank you very much, and I'm sorry for my horrible english.
> -- 
> ********************************************
> 	Julio Baixauli Garreta
> 	[email protected]
> ********************************************
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