On Fri, Feb 26, 2016 at 03:51:25PM +0100, Mikhail Morfikov wrote: > I wanted to implement IPv6 in my network, but my debian machine has some > issues > with it. The IPv6 connection works just fine when configured statically via > the > /etc/network/interfaces file in the following way: [...] > It also works fine when I use the following line instead: > > iface bond0 inet6 auto > > But there's some issues when I want to use DHCP: > > iface bond0 inet6 dhcp > > In the last case, there's no default route, and the connection simply doesn't > work.
Hm, could it be that your DHCP6 server does advertise a default route?
> ifup[75305]: /sbin/sysctl -q -e -w net.ipv6.conf.bond0.accept_ra=1
>
> According to the kernel documentation on this sysctl parameter, there's
> something like this:
>
> 0 Do not accept Router Advertisements.
> 1 Accept Router Advertisements if forwarding is disabled.
> 2 Overrule forwarding behaviour. Accept Router Advertisements even if
> forwarding is enabled.
>
> I've set this option manually to 2.
This is documented in interfaces(5). The reason is that in general, when
forwarding is enabled, you are a router, in which case it is more likely
that you want to set your own gateway route than to have one assigned by
DHCP. But you can change it in /etc/network/interfaces like this:
iface bond0 inet6 dhcp
accept_ra 2
That begs the question though: could it be that you are getting your
IPv6 address via DHCP, but the IPv6 gateway via router advertisements?
To me that is a very strange situation.
--
Met vriendelijke groet / with kind regards,
Guus Sliepen <[email protected]>
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