On Monday 07 March 2011 23:54:18 Nils Holland wrote: > Hi folks, > > well, this is not a strictly Gentoo-related question, but probably > someone in here has an idea on this anyway. > > I currently have the following situation here: > |Internet| > | > | (Dynamic public IPv4 address) > > DSL-Router > > | (192.168.178.1) > > - > > | (192.168.178.40, via WLAN) > > GentooBox1 > > | (192.168.0.1, via Ethernet) > > - > > | (192.168.0.2...n, via Ethernet) > > GentooBox2...n > > The point in this setup is to have one machine with the best WLAN > reception the Internet connection via WLAN, and serve as a router so > that the other machines (many of which have problems receiving the > weak WLAN signal) are connected via Ethernet and can reach the > Internet via GentooBox1 (and communicate with one another at 100 > MBit/s or GigE speed). Works fine. Will do the job at least until > I'll finally come around to pulling a cable between the DSL router in > the floor below me and this room, which is the eventually planned > solution. > > Now, however, IPv6 has entered the picture and makes things more > difficult. At least I have not yet been able to find a way to make it > work nicely in this scenario. Currently, I'm receiving IPv6 via a 6to4 > tunnel established directly by my DSL router. So the above diagram, > > with regard to IPv6, would look like this: > |Internet| > > DSL-Router > > | (dynamic /48 based on its current public IPv4 address) > > - > > | (/64 address based on prefix and MAC of interface, > | > | assigned magically by the DSL router (I guess) (WLAN)) > > GentooBox1 > > | ??? (Ethernet) > > - > > | ??? (Ethernet) > > GentooBox2...n > > The ??? are where my problems start. I don't really have a clue what > to do here. I probably shouldn't really manually assign IPv6 addresses > to GentooBox1's and GentooBox2's Ethernet cards, since these wouldn't > be worth much, as the prefix would change any time the IPv4 address > that serves as a basis for the 6to4 address changes. I could also > install radvd on GentooBox1, but the changing prefix would probably be > a problem in that case as well, and I have the feeling that this > wouldn't help me much anyway, as I'd probably have to add some routes > to my DSL router's routing table for things to work - problem is, the > DSL router will only let me manually add IPv4 routes, not IPv6 ones > (at least with its official firmware). > > So, any ideas or pointers what I could do here? Of course, if I didn't > have two subnets, things would be simple (then the DSL router could > handle everything), but this just isn't the situation I have here > right now. Bridging the Ethernet interface and the WLAN interface on > GentooBox1 was my first idea actually, but doesn't seem to work with > its WLAN NIC. And of course, any machines "behind" GentooBox2 could > establish their own IPv6 tunnel connections, but ... well ... I the > strong feeling that what I've been trying above should work as well > ... somehow! ;-)
I have not tried this myself (my router won't do ipv6 yet) so you'll need to try it out yourself. Instead of terminating the tunnel at your router, forward it as is and terminate it at gentoo box 1. Then forward the ipv6 addresses from there for each of your clients. This means that the router will no longer function as such and for all intends and purposes you can place it in a fully bridged mode (no WAN IP address, no NAT-ing, no DHCP-ing. Hope this helps. -- Regards, Mick
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