Re: Avoiding EUI64 addresses on Ubuntu 12.04

[Mark Elkins]

In /etc/sysctl.conf, add the one line (per ethernet device)

net.ipv6.conf.eth0.autoconf = 0


On Wed, 2013-05-22 at 15:41 +0200, Dick Visser wrote:
> Hi
> 
> I'm trying to configure an Ubuntu 12.04 Server VM with static IP addresses.
> The config is this:
> 
> 
> # The loopback network interface
> auto lo
> iface lo inet loopback
> 
> # The primary network interface
> auto eth0
> iface eth0 inet static
>         address 192.87.38.9
>         netmask 255.255.255.192
>         gateway 192.87.38.1
> 
> # IPv6 static address
> iface eth0 inet6 static
>         address 2001:610:148:cafe::9
>         netmask 64
>         autoconf 0
>         privext 0
>         dns-search terena.org
>         dns-domain terena.org
>         dns-nameservers 2001:610:1:800a:192:87:106:106
> 2001:610:188:140:145:100:188:188
> 
> 
> Because there is a bug in network-manager, I also set this in
> /etc/sysctl.d/10-ipv6-privacy.conf:
> 
> net.ipv6.conf.all.use_tempaddr = 0
> net.ipv6.conf.default.use_tempaddr = 0
> 
> After rebooting I still have the EUI64 address:
> 
> 
> eth0      Link encap:Ethernet  HWaddr 00:50:56:86:00:0f
>           inet addr:192.87.38.9  Bcast:192.87.38.63  Mask:255.255.255.192
>           inet6 addr: 2001:610:148:cafe:250:56ff:fe86:f/64 Scope:Global
>           inet6 addr: fe80::250:56ff:fe86:f/64 Scope:Link
>           inet6 addr: 2001:610:148:cafe::9/64 Scope:Global
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:477 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:474 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:90380 (90.3 KB)  TX bytes:76199 (76.1 KB)
> 
> lo        Link encap:Local Loopback
>           inet addr:127.0.0.1  Mask:255.0.0.0
>           inet6 addr: ::1/128 Scope:Host
>           UP LOOPBACK RUNNING  MTU:16436  Metric:1
>           RX packets:222 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:222 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:16746 (16.7 KB)  TX bytes:16746 (16.7 KB)
> 
> 
> Any idea how to get rid of it?
> This is a server, and I don't want privacy/security extensions, just
> the manually configured address.
> 
> 
> Thanks!!!
> 
> 
> 

-- 
  .  .     ___. .__      Posix Systems - (South) Africa
 /| /|       / /__       m...@posix.co.za  -  Mark J Elkins, Cisco CCIE
/ |/ |ARK \_/ /__ LKINS  Tel: +27 12 807 0590  Cell: +27 82 601 0496

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