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LAN addresses in IPv6



I've been playing with ipv6,
and can use it externally thanks to a tunnel from sixxs.net .
But I'm puzzled about its use inside my home network.

What are the ipv6 addresses of the machines on this LAN?
Are they the ipv6 addresses given by "ifconfig -a"?
Or are they modifications of the "local address" given me by sixxs?

I should say that the question is theoretical at the moment,
as I am running Centos-5.2 and shorewall on my server,
and it seems I have to wait until shorewall6 comes along for Centos,
which apparently needs a more recent kernel and iptables
than currently running under Centos, according to
<http://www.shorewall.net/IPv6Support.html>.

But I'd like to be prepared for the happy day.

I find that at present I can ping6 from any laptop to itself
using the ipv6 address from ifconfig -a:
-------------------------------------
[tim mary ~]$ ping6 -Ieth1 fe80::240:f4ff:fe4d:608a
PING fe80::240:f4ff:fe4d:608a(fe80::240:f4ff:fe4d:608a) from 
fe80::240:f4ff:fe4d:608a eth1: 56 data bytes
64 bytes from fe80::240:f4ff:fe4d:608a: icmp_seq=0 ttl=64 time=0.058 ms
-------------------------------------
But I cannot ping6 from one machine to another:
-------------------------------------
[tim helen ~]$ ping6 -Ieth1 fe80::202:2dff:fe21:3c9
PING fe80::202:2dff:fe21:3c9(fe80::202:2dff:fe21:3c9) from 
fe80::240:f4ff:fe4d:608a eth1: 56 data bytes
ping: sendmsg: Operation not permitted
-------------------------------------

I assume that shorewall is preventing this.

Incidentally, I didn't find any online documentation
giving much help with IPv6 under Fedora and/or Centos;
all the ipv6 documents seemed aimed at someone
very different to myself.


-- 
Timothy Murphy  
e-mail: gayleard /at/ eircom.net
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland



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