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Re: [v6ops] DHCPv6 PD client on cellular on Android

"Templin, Fred L" <Fred.L.Templin@boeing.com> Wed, 06 September 2017 16:40 UTC

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From: "Templin, Fred L" <Fred.L.Templin@boeing.com>
To: Alexandre Petrescu <alexandre.petrescu@gmail.com>, "v6ops@ietf.org" <v6ops@ietf.org>
Thread-Topic: [v6ops] DHCPv6 PD client on cellular on Android
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Date: Wed, 06 Sep 2017 16:40:08 +0000
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Subject: Re: [v6ops] DHCPv6 PD client on cellular on Android
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Hi Alex,

> -----Original Message-----
> From: Alexandre Petrescu [mailto:alexandre.petrescu@gmail.com]
> Sent: Wednesday, September 06, 2017 9:11 AM
> To: Templin, Fred L <Fred.L.Templin@boeing.com>; v6ops@ietf.org
> Subject: Re: [v6ops] DHCPv6 PD client on cellular on Android
> 
> Fred,
> 
> Le 06/09/2017 à 16:35, Templin, Fred L a écrit :
> [...]
> > The problem is that the goal of DHCPv6 is to first obtain
> > addressing information and second to assign addresses to interfaces.
> 
> Let's clarify this.
> 
> We dont want DHCP to assign addresses on interfaces.  We want it to
> obtain a prefix from the network (DHCPv6 Prefix Delegation).  Right?

Obtain a prefix, yes. But, presumably, the Android node will want to use
the prefix in some fashion. It can either act as a router (which is prohibited
by Android without rooting the device) or it can act as a host and try to
assign addresses from the delegated prefix to an interface (which is also
prohibited by Android w/o rooting the device). 

> > But, Android does not allow apps to assign addresses to regular
> > interfaces.
> 
> If so, it seems like a problem of Android.

AFAICT, Android tries to protect users from shooting themselves in
the foot. Rooting the device is the user's way of saying: "I know what
I am doing and accept the consequences of my actions" but it voids
any warranties.

> It's hard to accept buying an expensive smartphone with its data plan
> yet be forbidden to set an address on it on the command line.  I should
> be allowed to freely set not one, but as many addresses that I want.

You can try bringing up a terminal window app on the Android and
type: "ip -6 addr add 2001:db8::1 dev X" but it will not let you do it.

Thanks - Fred

> Alex

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