[Starlink] dhcpv6-pd details

Tue May 18 10:50:23 EDT 2021

That could be the reason, yes. Some times I get France as Groundstation.

> On 18. May 2021, at 16:48, Nick Buraglio <buraglio at forwardingplane.net> wrote:
> 
> I suspect it is due to roaming between ground stations, but I am totally guessing. 
> 
> nb
> 
> ᐧ
> 
> On Tue, May 18, 2021 at 6:41 AM Annika Wickert <aw at awlnx.space <mailto:aw at awlnx.space>> wrote:
> My lease time is also at 5min, I am in Germany close to Munich.
> 
> Maybe it stops changing when my pole mount finally arrives and I get a more stable connection.
> 
>> On 18. May 2021, at 13:37, Nick Buraglio <buraglio at forwardingplane.net <mailto:buraglio at forwardingplane.net>> wrote:
>> 
>> 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 <mailto: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 <mailto: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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>>> 
>>> 
>>> 
>>> -- 
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>>> 
>>> Dave Täht CTO, TekLibre, LLC
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