Wed, 10 Feb 2010
Playing with 6to4
We have finally got some time to work on native IPv6 inside a faculty network
(which includes rewriting the
iptables configuration to be
protocol-neutral). In order to test it, I have enabled
6to4 at home.
So now I have a native IPv6 in my home network, and I can even directly
SSH to devices in my home network from the university network, even though
the home network is hidden behind a single IPv4 address. Apparently my traffic
is routed symmetrically, as both directions use the same 6to4 relay
ip-exchange.de in Nuernberg.
As for the network parameters, I have a direct
ping 13.2 ms,
ping6 is 27.1ms. The transfer rate, on the other hand,
is purely limited by my ISP (measured by SCPing a large file), and it is
the same for both protocols - slightly above 500 KB/s. Now if only I had a nearer 6to4 relay (maybe in NIX.CZ?).
The setup in Fedora is relatively straightforward, except when the outgoing interface has an IPv4 address assigned from DHCP. So I had to add the IPv6 configuration manually, and will have to change it whenever I get a new IPv4 address (which is usually once per year or two).
Update - Wed, 10 Feb 2010: Fedora problems fixed
My previous statement about problems in Fedora was not true. I must have made a mistake somewhere, but after recheking my setup and restarting the network the 6to4 tunnel works as expected.