-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello all. Apologies for the off topic post, but since those happen on and off here anyway, I thought I'd post my quandary, and see if someone might be able to help. Like the subject says, I'm trying to get ipv6 traffic routed to a tap device. Let me explain in detail. I have a user-mode linux vm running on a host system. The vm is able to communicate with the host, my lan, and the rest of the world just fine via ipv4 over a persistent tap device, tap0. I'm trying to get the vm to use ipv6. I have a routed prefix, the machines on my lan can talk to each other, and the world over ipv6, and the world can in turn talk to all of them over ipv6. For the purposes of my post, let's say I'm using the 2001:db8::/32 address space, though I am in fact using a routed address space. Here's what I have, tap0 on the host is configured as 2001:db8::1/32, and eth0 inside the vm is configured as 2001:db8::2/32. If I use telnet from inside the vm to try to connect to the host, my lan, or the world, I get network is unreachable. If I run tcpdump on the tap0 interface on the host, I can see neighbor solicitations going out from the vm, but tap0 is as far as those packets go. If I try to connect to the vm from the host, or my lan, I get no route to host, and no packets appear on the host's tap0 interface. So, it looks like the vm and tap0 are setup just fine, and I need to figure out how to route ipv6 traffic between the tap device/host/lan/world. If on the host I do ip -6 route add 2001:db8::2 I can then connect to all ports on the host system from inside the vm, but I still can't connect to my lan/world from the vm, and the host/lan/world still can't connect to the vm, coming back with no route to host. During my googling, I've found people with the same issue on the user-mode-linux-users list, but no solution. This looks like it definitely should work if configured right, so I'm assuming the people that had this problem either solved it, and didn't share with that list, or they just gave up on it. Other pages on the web indicate that simply assigning an address to the vm, and to the tap device should be enough to make things work, but it obviously isn't, at least not for me, and for others as far as I can gather from my research. So, can someone please explain where I'm going wrong, and how to do it correctly? If I come across something that works, I'll post back, so that this is at least documented somewhat out on the web. If more info is needed, please let me know. Once I get this working, since there's no need for the tap device to have a routed ip as far as I can tell, what I'd like to do if possible, is to in fact really place the tap device, and the vm on the 2001:db8::/32 address space, and also assign a routable ip to eth0 inside the vm, assuming that is possible, and could be made to work. Thanks in advance for any help. Greg - -- web site: http://www.romuald.net.eu.org gpg public key: http://www.romuald.net.eu.org/pubkey.asc skype: gregn1 (authorization required, add me to your contacts list first) - -- Free domains: http://www.eu.org/ or mail dns-manager at EU.org -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) iEYEARECAAYFAkoPH4IACgkQ7s9z/XlyUyDBhwCg0TlCHfac/Fi8q9DpcSkzwL4V 5pwAoLCM+PXOAqA7qb4gJFgXJkOCjKEf =z0qn -----END PGP SIGNATURE-----
