On Tue, Dec 28, 2021, at 21:05, Mike Fischer wrote: >> Am 28.12.2021 um 13:09 schrieb Paul de Weerd <[email protected]>: >> Seems like the simplest way, especially using the lladdr option. > Yes, I’ll give that a try.
Ok, I have tried the following: Remove my current IPv6 configuration from em0: # ifconfig em0 -inet6 Test the new configuration: # ifconfig em0 inet6 autoconf eui64 lladdr f2:b6:71:e6:11:7e This results in: - The interface em0 has the expected lladr of f2:b6:71:e6:11:7e - The link local IPv6 address is: fe80::f0b6:71ff:fee6:117e (using the modified EUI-64 version of the lladdr) as expected - The public IPv4 IPs use my current prefix and a random IID, no relation to the lladdr: 2001:db8::eb7f:1267:44d0:45a4 (*) - The ULA addresses behave the same as the public ones, i.e. the IID has not relation to the lladdr. Why is (one of) the public addresses not using the EUI-64 method of generation the IID? I realize that autoconf generates the SOII addresses with random IIDs. But shouldn’t the eui64 option also create an IP with the modified EUI-64 as the IID? ifconfig(8) states: eui64 Fill the interface index (the lowermost 64 bits of an IPv6 address) automatically. Which is kind of a bland statement anyway. It should IMHO reference that a modified EUI-64 is used. But it does not say that this is only true for the link local address. If have tried changing the order of the parameters, but it makes no difference: ifconfig em0 inet6 autoconf lladdr f2:b6:71:e6:11:7e eui64 ifconfig em0 inet6 lladdr f2:b6:71:e6:11:7e eui64 autoconf I have also tried to do this without the lladdr parameter, same results just with a different lladdr. If I leave out the autoconf parameter I only get a link local address. *) I have substituted 2001:db8:: for the real public prefix here. Thanks! Mike
