Disabling ipv6

[Tom Horsley]

On Tue, 9 Jul 2013 10:58:59 +0200
J.Witvliet at mindef.nl wrote:

> My I _kindly_ ask not to do that anymore?
> Even though such trick might take away the symptoms for you and me, it is a technical overkill and only tackles the symptoms.

My main symptom is the single longest delay during the
mostly zippy boot is bringing up the network where it
appears to be expecting to be given an IPv6 address
and times out eventually after not getting one.

I have certainly been tempted to disable ipv6
just to find out if that really is the source of the
delay.