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Re: LAN addresses in IPv6



On Monday 09 March 2009 06:33:13 Timothy Murphy wrote:
> 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

the fe80 addresses are link local -- not useful from one machine to the other.

> 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.
>

look into radvd

this site is helpful: http://www.wsrcc.com/wolfgang/fedora/ipv6-tunnel.html

> --
> 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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