Robert,
Michel Py wrote: +-----+---------+---------+-------+--------------+ | 8 | 16 | 16 | 8 | 16 | | | hostid | | index | routernumber | +-----+---------+---------+-------+--------------+ 02 ca : fe FF : FE 77 : beef
Robert Kiessling wrote: I'm talking about network address derived from router number and some local interface index. This is not possible in the 16 bits available in the assignment.
I don't understand; there are 40 bits in the example? (and I could have squeezed 6 more).
cisco3640(config-if)#mac-address ca.fe77.beef Changing the MAC address to get an easily usable IP address seems quite perverse to me.
Indeed it is, but this was the long way to demonstrate how it is derived. And is besides the point, as we were talking about tunnels and they don't have a MAC address of their own, so you can go ahead and directly configure an EIU-64 or modified-EUI-64 IPv6 address directly as show in the short way. Michel.