Re: Dealing with ICMPv6 network unreachable.

[Roy Marples <roy%marples.name@localhost>]

On Fri, 2015-04-03 at 08:59 +0200, Martin Husemann wrote:
> On Thu, Apr 02, 2015 at 08:58:01PM +0100, Roy Marples wrote:
> > onto the IPv4 address which works fine. This is quite a fast operation.
> > Other applications, such as ssh and firefox also have long stalls before
> > falling back to IPv4 and again the fallback is quite prompt in Linux.
> 
> Firefox usually tries both connections in parallel ("Happy Eyeballs").
> You can disable this by setting network.http.fast-fallback-to-IPv4 to
> false in about:config, and you can completely disable v6 by
> setting network.dns.disableIPv6 to false.

Yes, firefox works reasonably well and is the exception.

> However, your description does not sound like connections are the real
> problem, but more your DNS setup. Did the router provide a nameserver
> with IPv6 address in the DHCP option?

Yes it did.
And it works fine. It gives the same responses as the IPv4 nameserver.
On both NetBSD and Linux, wget gets the IPv6 address first.

Roy