[Starlink] dhcpv6-pd details

[Nick Buraglio]

Interesting. My lease time is set to 5m(!!!) but it’s only changed once in
about 2 months. Where are you located?

nb

On Tue, May 18, 2021 at 3:33 AM Annika Wickert <aw at awlnx.space> wrote:

> I got dhcpv6-pd running some time ago with wide-dhcpv6 and the following
> settings:
>
> profile default
> {
>   information-only;
>
>   request domain-name-servers;
>   request domain-name;
>
>   script "/etc/wide-dhcpv6/dhcp6c-script";
> };
>
> interface eth0 {
>         send ia-pd 0;
>         send ia-na 0;
> };
>
> id-assoc na 0 {
> };
>
> id-assoc pd 0 {
>         prefix-interface wlan0 {
>                 sla-len 8;
>                 sla-id 1;
>         };
>         prefix-interface eth0.222 {
>                 sla-len 8;
>                 sla-id 2;
>         };
>
> };
>
>
> To request my IPv6 /64 on my WAN interface I run the following every two
> minutes, otherwise I lose the address:
> /bin/rdisc6 -v eth0
>
> With this v6 works very good and I have no issues at all.
>
> But prefixes change every 24 hours or so
>
> Best,
> Annika
>
>
> On 17. May 2021, at 21:15, 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.
>
>
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>
>
>
> --
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>
> Dave Täht CTO, TekLibre, LLC
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