netdev - IPv6 connect: Cannot assign requested address

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Date:	Wed, 19 Nov 2008 11:12:03 +0530
From:	Mohan Lal Jangir <mohanlal@...sung.com>
To:	netdev@...r.kernel.org
Cc:	Brian Haley <brian.haley@...com>
Subject: IPv6 connect: Cannot assign requested address

I have a system with following configuration

[localhost:/root] ifconfig eth0
eth0     Link encap:Ethernet  HWaddr 02:00:00:00:01:80
          inet addr:10.10.1.71  Bcast:10.10.1.255  Mask:255.255.255.0
          inet6 addr: fe80::ff:fe00:180/64 Scope:Link

I use a tcp client from this machine to establish connection with a server.
./tcp_client -d 172.16.15.24 -s 10.10.1.71 -p 6789

tcpdump shows following packets
10.10.1.71.33069 > 172.16.15.24.6789: S 3589851089:3589851089(0) win 5840 
<mss 1460,sackOK,timestamp 236863 0,nop,wscale 0> (DF)
10.10.1.71.33069 > 172.16.15.24.6789: S 3589851089:3589851089(0) win 5840 
<mss 1460,sackOK,timestamp 237163 0,nop,wscale 0> (DF)

However if I try with IPv6
./tcp_client -d 2000::86 -s fe80::ff:fe00:180 -p 6789

I get error
connect: Cannot assign requested address

Does it mean it is not possible to even send a SYN packet to a global 
address without having a global address ?

Thanks
-Mohan


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