[Starlink] dhcpv6-pd details

[Annika Wickert]

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 <mailto: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 <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/ <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/ <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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>> Starlink at lists.bufferbloat.net <mailto:Starlink at lists.bufferbloat.net>
>> https://lists.bufferbloat.net/listinfo/starlink <https://lists.bufferbloat.net/listinfo/starlink>
> 
> 
> 
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> 
> Dave Täht CTO, TekLibre, LLC
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