Re: [v6ops] DHCPv6 PD client on cellular on some IoT platform

Hi Alex,

We have been doing DHCPv6 PD on Androids for a long time. DHCPv6 messaging
is via a tunnel over the cellular and WiFi links. The DHCPv6 client app was easy to
implement and requires just a small amount of code and a few DHCPv6 messages.
The DHCPv6 server we are using is from ISC.

Thanks - Fred

> -----Original Message-----
> From: v6ops [mailto:v6ops-bounces@ietf.org] On Behalf Of Alexandre Petrescu
> Sent: Wednesday, May 24, 2017 10:06 AM
> To: v6ops@ietf.org
> Subject: [v6ops] DHCPv6 PD client on cellular on some IoT platform
> 
> Hello,
> 
> We discussed extensively about the potential use of DHCPv6 Prefix
> Delegation on cellular links.
> 
> The chicken issue is the lack of DHCPv6 PD software on typical User
> Equipment.  For example, there is no DHCPv6-PD app on Android.  The egg
> issue is the lack of operator support of DHCPv6-PD towards the User
> Terminal.  For example, there is no cellular operator answering to
> DHCPv6-PD requests issued by the User Terminal.
> 
> To address the chicken issue, we started with an ISC DHCP open software
> client, which does implement Prefix Delegation.  It can be
> (cross)compiled on various platforms; then type "./dhclient -6 -P"; this
> sends an DHCPv6 Solicit Identity Associtaion for Prefix Delegation
> message on the interface.
> 
> However, whereas this software runs ok on interfaces such as Ethernet,
> USBnet and WiFi interfaces, it breaks if run on the cellular interface
> of some IoT cellular platform.  The error can be corrected by the
> quick-and-dirty solution below.
> 
> Alex
> 
> ------------------------------------------------------------------------
> The error says "//UNSUPPORTED DEVICE TYPE 503 FOR RMNET0."
> dhcp-4.3.5
> ./common/lpf.c
> line number: 551
> 
> //default:
> //      log_fatal("Unsupported device type %ld for \"%s\"",
> //                (long int)sa->sa_family, name);
>    default:
>          hw->hlen = 7;
>          hw->hbuf[0] = HTYPE_ETHER;
>          memcpy(&hw->hbuf[1], sa->sa_data, 6);
>    break;
> 
> (two programmers worked this out).
> 
> Alex
> 
> _______________________________________________
> v6ops mailing list
> v6ops@ietf.org
> https://www.ietf.org/mailman/listinfo/v6ops