[Xorp-users] Virtual interfaces in GNU/Linux (now IPv6)

[Pepo]

El Lunes, 18 de Diciembre de 2006 03:29, escribió:
> > The output using ip addr is:
> >
> > 1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue
> >     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
> >     inet 127.0.0.1/8 scope host lo
> >     inet6 ::1/128 scope host
> >        valid_lft forever preferred_lft forever
> > 2: eth1: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
> >     link/ether 52:54:00:12:34:86 brd ff:ff:ff:ff:ff:ff
> >     inet 192.168.1.10/24 brd 192.168.1.255 scope global eth1
> >     inet 192.168.13.1/24 brd 192.168.13.255 scope global eth1:1
> >     inet6 fe80::5054:ff:fe12:3486/64 scope link
> >        valid_lft forever preferred_lft forever
> > 3: sit0: <NOARP> mtu 1480 qdisc noop
> >     link/sit 0.0.0.0 brd 0.0.0.0
> >
> > What do you think?
>
> You have a single network interface (eth1) with two IP addresses.
> For multicast routing purpose, this counts as a single interface.
> If you have the limitation of only one physical network interface,
> but you want to have a multicast router with several network
> interfaces, then you need to create virtual interfaces/tunnels such
> as GRE tunnels, OpenVPN tunnels, VLANs, etc.
>
> If you don't have much experience with tunnels setup, I'd recommend
> to start with OpenVPN (http://openvpn.net/). It is quite portable
> and easy to configure. E.g., you could just run a pair of
> commands like the following on both sides of a tunnel:
>
> openvpn --local 10.6.0.2 --remote 10.9.0.2 --ifconfig 30.30.30.1
>         30.30.30.2 --dev tun0
> openvpn --local 10.9.0.2 --remote 10.6.0.2 --ifconfig 30.30.30.2
>         30.30.30.1 --dev tun0
>
> FYI, you could use openvpn even across a NAT because it is TCP/UDP
> based.
>
> After that you need to use the virtual tun0 interface as one of the
> interfaces on the XORP router.
>
> Regards,
> Pavlin

Hi. I could use tunnels in IPv4, but now I am trying to make the same with 
IPv6 but I don't know how, this is my commands and error messages:

ip link set dev eth0 up
ip -6 addr add fec0:2006:2007::1:5/126 dev eth0

(with ping6 fec0:2006:2007::1:6 can see the remote PC)

openvpn --remote fec0:2006:2007::1:6 --dev tun0 --tun-ipv6 --ifconfig 
fec0:2006:2007::2:5 fec0:2006:2007::2:6

Sun Jan 14 19:20:47 2007 OpenVPN 2.0.9 i486-pc-linux-gnu [SSL] [LZO] [EPOLL] 
built on Oct 10 2006
Sun Jan 14 19:20:47 2007 IMPORTANT: OpenVPN's default port number is now 1194, 
based on an official port number assignment by IANA.  OpenVPN 2.0-beta16 and 
earlier used 5000 as the default port.
Sun Jan 14 19:20:47 2007 ******* WARNING *******: all encryption and 
authentication features disabled -- all data will be tunnelled as cleartext
Sun Jan 14 19:20:47 2007 RESOLVE: Cannot resolve host address: 
fec0:2006:2007::1:6: [HOST_NOT_FOUND] The specified host is unknown.
Sun Jan 14 19:20:47 2007 RESOLVE: Cannot resolve host address: 
fec0:2006:2007::2:5: [HOST_NOT_FOUND] The specified host is unknown.
Sun Jan 14 19:20:47 2007 Exiting

Please, How do I get a tunnel in IPv6? (I need that to begin with PIM-SM 
configuration)
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