[Starlink] Main hurdles against the Integration of Satellites and Terrestial Networks

[Alexandre Petrescu]

Le 19/09/2023 à 01:32, Hesham ElBakoury a écrit :
> Given the discussions in this email thread, what IETF should standardize 
> in priority order  for the integrated NTN terrestrial networks?

Maybe make the NTN networks run IP, and preferably IPv6.  It would be a 
good step towards integrating with the IP flat networks on the ground.

(yes, I know, many will say that starlink does support IP and even IPv6, 
but I believe there is no IP in the sats; or maybe I have to read more).

Alex

> 
> Thanks,
> Hesham
> 
> On Sun, Sep 17, 2023, 12:59 PM David Lang via Starlink 
> <starlink at lists.bufferbloat.net <mailto:starlink at lists.bufferbloat.net>> 
> wrote:
> 
>     it's very clear that there is a computer in the dishy that you are
>     talking to.
>     You get the network connection while the dishy is not connected to the
>     satellites (there's even a status page and controls, stowing and
>     unstowing for
>     example)
> 
>     I think we've seen that the dishy is running linux (I know the
>     routers run an
>     old openwrt), but I don't remember the details of the dishy software.
> 
>     David Lang
> 
>        On Sun, 17 Sep 2023, Alexandre Petrescu via Starlink wrote:
> 
>      > Date: Sun, 17 Sep 2023 19:21:50 +0200
>      > From: Alexandre Petrescu via Starlink
>     <starlink at lists.bufferbloat.net <mailto:starlink at lists.bufferbloat.net>>
>      > Reply-To: Alexandre Petrescu <alexandre.petrescu at gmail.com
>     <mailto:alexandre.petrescu at gmail.com>>
>      > To: starlink at lists.bufferbloat.net
>     <mailto:starlink at lists.bufferbloat.net>
>      > Subject: Re: [Starlink] Main hurdles against the Integration of
>     Satellites and
>      >      Terrestial Networks
>      >
>      >
>      > Le 16/09/2023 à 01:32, Ulrich Speidel via Starlink a écrit :
>      >> On 16/09/2023 5:52 am, David Lang wrote:
>      >>>
>      >>> In addition to that Ulrich says, the dishy is a full computer,
>     it's
>      >>> output is ethernet/IP and with some adapters or cable changes, you
>      >>> can plug it directly into a router.
>      >>
>      >> We've done that with the Yaosheng PoE Dishy adapter - actually
>     plugged
>      >> a DHCP client straight in - and it "works" but with a noticeably
>      >> higher rate of disconnects.
>      >
>      > It is good to know one can plug a DHCP client into the Ethernet
>     of the
>      > DISHY and receive DHCP replies.
>      >
>      > But that would be only a lead into what kind of DHCPv4 is
>     supported, or not.
>      >
>      > I would ask to know whether the DHCP server runs on the DISHY, or
>      > whether it is on the ground network of starlink, i.e. the reply
>     to DHCP
>      > request comes after 50ms, or after 500microseconds (timestamp
>     difference
>      > can be seen in the wireshark run on that Ethernet).
>      >
>      > This (DHCP server daemon on dishy or on ground segment) has an
>     impact of
>      > how IPv6  can be, or is, made to work.
>      >
>      > This kind of behaviour of DHCP - basically asking who allocates an
>      > address - has seen a continous evolution in 3GPP cellular
>     networks since
>      > they appeared.  Nowadays the DHCP behaviour is very complex in a
>     3GPP
>      > network; even in a typical smartphone there are intricacies about
>     where
>      > and how the DHCP client and server works. With it comes the
>     problem of
>      > /64 in cellular networks (which some dont call a problem, but I do).
>      >
>      > So, it would be interesting to see whether starlink has the same /64
>      > problem as 3GPP has, or is free of it (simply put: can I connect
>     several
>      > Ethernet subnets in my home to starlink, in native IPv6 that is,
>     or not?).
>      >
>      > Alex
>      >
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