[ale] IPv6 - disabling RA client when static IPv6 address is configured?

[Chris Woodfield]

This disabled the assignment of a different IPv6 IP address, but strangely I still got the second link-layer IPv6 default gateway.

I added these directives to sysctl.conf to stop that from happening:

net.ipv6.conf.all.accept_ra = 0
net.ipv6.conf.eth0.accept_ra = 0
net.ipv6.conf.default.accept_ra = 0

Thanks again for the pointer!

-Chris

On Apr 25, 2010, at 5:16 28PM, Michael Trausch wrote:

> On Sat, Apr 24, 2010 at 9:04 PM, Chris Woodfield <rekoil at semihuman.com> wrote:
>> I have my home network sitting behind an Airport Extreme with an IPv6 tunnel set up to a local ISP who's doing an IPv6 rollout, complete with my own /64 allocation. For the server, I went ahead and configured a static IPv6 address (/etc/network/interfaces on an Ubuntu install), but I'm also running RA on the AE for the benefit of my other machines.
>> 
>> What I've noticed is that in addition to the static, the server still configures a global IPv6 address from the route advertisements:
>> 
>> eth0      Link encap:Ethernet  HWaddr 00:26:18:95:5d:bd
>>          inet addr:192.168.0.41  Bcast:192.168.0.255  Mask:255.255.255.0
>>          inet6 addr: 2607:f080:207:201::41/64 Scope:Global
>>          inet6 addr: 2607:f080:207:201:226:18ff:fe95:5dbd/64 Scope:Global
>>          inet6 addr: fe80::226:18ff:fe95:5dbd/64 Scope:Link
>> 
>> I also wind up with two default gateways, one being the AE's static IPv6 address and the other its link-local:
>> 
>> ::/0                           2607:f080:207:201::1       UG   1   0  2621 eth0
>> ::/0                           fe80::21b:63ff:fef4:69f7   UGDAe 1024 0     0 eth0
>> 
>> Not sure why, but this causes local transfers over IPv6 to go verrry slooowwwwwly. When I delete the RA-configured address and gateway, things go back to normal...until both get repopulated a few minutes later when the AE sends out the next RA packet.
>> 
>> Anyone have any ideas how to stop the autoconfiguration of IPv6 addresses when I'm doing it statically already?
> 
> Yes, disable the automatic configuration on the interface:
> 
> net.ipv6.conf.all.autoconf = 0
> net.ipv6.conf.default.autoconf = 0
> 
> Put that in /etc/sysctl.conf to prevent IPv6 autoconfiguration after
> the next time you reboot, and then:
> 
> $ for i in all default eth0; do sudo sysctl -w
> net.ipv6.conf.${i}.autoconf=0; done
> 
> To disable it without rebooting.  Then you can remove the
> autoconfigured address and it will not reappear.  Don't forget to
> delete the extra routing information as well.
> 
>   -- Mike
> 
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