Subj : Re: Help? To : Nicholas Boel From : Markus Reschke Date : Thu Feb 26 2015 11:29:12 Hello Nicholas! Feb 25 17:14 2015, Nicholas Boel wrote to Markus Reschke: NB> $ cat /proc/sys/net/ipv6/conf/enp2s6/use_tempaddr NB> 0 NB> So according to the above, I shouldn't have two addresses, right? No, that means PE isn't the cause of your two addresses. MR>> When you enable PE you'll get two addresses for each prefix. The MR>> first one is the automatic one based on the MAC. And the second one is MR>> the random one. There are also some timers which can be adjusted to MR>> optimize the handling of the address changes. NB> This is where the problem lies. I don't have PE enabled, so I NB> shouldn't have two addresses. And you also mention that the first one NB> is the automatic based on the MAC, whereas it seems as though my two NB> are backwards! I didn't relate directly to your specific addresses, it was just the explanation of PE. NB> $ ifconfig NB> enp2s6: flags=4163 mtu 1500 NB> inet 192.168.1.100 netmask 255.255.255.0 broadcast NB> 192.168.1.255 NB> inet6 2001:470:1f11:1027:68d4:530a:2845:6954 prefixlen 64 NB> scopeid 0x0 NB> inet6 2001:470:1f11:1027:207:e9ff:fe49:6711 prefixlen 64 ^ ^^ ^^ NB> scopeid 0x0 NB> inet6 fe80::207:e9ff:fe49:6711 prefixlen 64 scopeid ^ ^^ ^^ This is the MAC based EUI-64. You have a fffe in the middle and the 2nd bit of the first byte is set. Another cause for the two public addresses could be a broken configuration of SLAAC and DHCPv6. Regards, Markus --- * Origin: *** theca tabellaria *** (2:240/1661) .