[Starlink] dhcpv6-pd details

[Nathan Owens]

> Starlink provides a router, also? I'm so confused. I thought the dishy
was all there was. Care to tear it apart and describe what's in it?

This is what I was talking about in the other thread — there is a provided
router, its Qualcomm IPQ40xx based, and seems to run OpenWrt

The dish runs a custom ST Microelectroncis chip, and unknown firmware.

On Mon, May 17, 2021 at 12:15 PM Dave Taht <dave.taht at gmail.com> wrote:

> On Mon, May 17, 2021 at 12:04 PM Nick Buraglio <nick at buraglio.com> wrote:
> >
> > As discussed privately with Dave, I have removed the starlink provided
> > router and replaced it with a Mikrotik RB2011 to allow for more
>
> Running routerOS? Latest beta's of that have cake in 'em.
>
> > granular control, and to better tie into my existing network.
>
> Starlink provides a router, also? I'm so confused. I thought the dishy
> was all there was. Care to tear it apart and describe what's in it?
>
> > This has
> > allowed me to make a dhcpv6-pd request that is reasonably stable (so
> > far it has changed once in the last 2 months). The lease time is
> > incredibly short, which is a little strange but as long as the DHCPv6
> > server is the same and remains unchanged, it should just hand out the
> > same prefix upon request.
>
> That was a terrible habit that comcast had got into in the early days
> that forced
> openwrt to flush and reload the firewall every minute, or less.
>
> I'd pioneered a stateless firewall in cerowrt that never ever ever
> needed to reload the
> rules, using a pattern match for each specifically renamed ethernet
> interface.
>
> Regrettably that was not accepted into openwrt, because "nftables" was
> just around the corner.
> It scaled beautifully to tons of interfaces going up and down so long
> as they were named appropriately,
> at far less cpu overhead for complicated rules than the standard
> openwrt firewall.
>
> https://www.bufferbloat.net/projects/cerowrt/wiki/CeroWall/?version=9
>
> Anyway, I don't remember all that we did to suppress the flood of
> useless static changes
> to everything ipv6, but I hope that whatever we ended up doing still
> works in this case.
>
> > I also built a very crude measurement display that just uses curl get
> > and dig via smokeping to display reasonable RTT. It's detailed in the
> > reddit post here:
> >
> https://www.reddit.com/r/Starlink/comments/mykxjv/functional_ipv6_and_some_crude_starlink_latency/
> > and can be viewed directly here:
> > https://starmon.qosbox.com/
>
> THX! We really need to collect the "good" information and publish it
> somewhere, the reddit noise level is too high.
>
> One piece of mis-information I think was the news you can "route"
> packets over ipv4 with a box in front of it and
> a default gw of 192.168.100.1 Not clear from that news whether or not
> NAT was required on the next hop or not... ?
>
> (that's from another reddit post I mis-remember)
>
> >
> > Making dhcpv6-pd work is pretty standard:
> >
> > /ipv6 dhcp-client
> >
> > add add-default-route=yes interface=ether2 pool-name=starlink-ipv6
> > prefix-hint=::/56 request=prefix
> >
> > On each interface you want to have IPv6 on:
> >
> > /ipv6 address
> >
> > add address=::1 from-pool=starlink-ipv6 interface=bridge.8
> >
> > add address=::1 from-pool=starlink-ipv6 interface=bridge.6
>
> THANKS SO MUCH. I am thinking at the moment that openwrt's dhcp-pd
> implementation is currently
> broken (it's not working on admittedly a comcast modem I just got that
> I'd not used before), but
> as soon as I get a chance I'll try configuring odhcpd6 to do something
> like this. If I can remember how.
>
>
> > _______________________________________________
> > Starlink mailing list
> > Starlink at lists.bufferbloat.net
> > https://lists.bufferbloat.net/listinfo/starlink
>
>
>
> --
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>
> Dave Täht CTO, TekLibre, LLC
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