Re: [tlug] IPoE and IPv6

[Bernie Innocenti <bernie@??>]

I've been using BIGLOBE's 10Gbps service for several months with no 
issues. It's super fast and low latency all day long. They made me wait 
2-3 weeks for installation because evidently I was the first customer 
purchasing the 10Gbps service and they had to run new fiber all the way 
to the end of the street.

Since activation, the service has been fast, low-latency and reliable. 
Until now I was charged only ¥1,188 per month. Yes, that's unbelievable 
for a 10GbE service! BIGLOBE has so many stackable promotions that it's 
hard to tell how much you're really going to pay over an entire 2-year 
contract. The base fee is actually ¥6,200 and I had to click through a 
shocking number of spammy campaigns to get a cumulative discount of ¥5000.

My home router is a GL-iNet GL-MT6000 (aka Flint2) with the factory 
firmware, an OpenWRT derivative with a custom UI which also provides 
access to LuCI and ssh. If you don't like it, there's always the option 
to flash the latest OpenWRT, but I didn't feel the need to.

For those who absolutely want to saturate a 10Gbit uplink, there is also 
a pricier Flint 3 router.

BIGLOBE gives me a /56 via DHCPv6. For IPv4, I've been using the 
modified MAP-E script from the fakemanhk/openwrt-jp-ipoe repo, and it 
works well. All I had to do was:

  ssh root@_gateway 'cat /lib/netifd/proto/map.sh' >map.sh.old
  cat map.sh.new | ssh root@_gateway 'tee /lib/netifd/proto/map.sh'

I don't remember exactly what I changed in LuCI to configure MAP-E, but 
I'm happy to share redacted /etc/config files if anyone asks.


On 4/23/26 10:55, Andrew Todd wrote:
> Hi Tod,
>
> I looked into this a bit last year in the context of using OpenWRT and 
> found this information that might be helpful. In my current living 
> situation, however, I couldn't really test it out. Evidently Hikari 
> 10Gbps might also be an option for IPoE.
>
> https://hcrudolph.com/posts/2025-03-openwrt/
> https://github.com/fakemanhk/openwrt-jp-ipoe
> https://ipv4.web.fc2.com/map-e.html
>
> I will also be curious to hear more as I am moving to a location where I 
> can probably choose my own ISP.
>
> Best,
>
> Andrew
>
> On 4/23/26 8:28 AM, Tod McQuillin wrote:
> > Greetings TLUG,
> >
> > I have been researching ISP options in Japan, and it seems there are 
> > basically two provisioning methods when using NTT フレッツ光ネクスト:
> >
> > * PPPoE
> > * IPoE
> >
> > While some ISPs do offer IPv6 over PPPoE, it's clearly a legacy 
> > technology on its way out, and IPoE looks like the future with its 
> > native IPv6.
> >
> > However, as I look more into it, I'm starting to realize that getting 
> > more than a single /64 of IPv6 address space via IPoE is ... let's 
> > just say needlessly complicated.
> >
> > I've learned from my research that unless you have ひかり電話, NTT's 
> > network will not even offer DHCPv6 prefix delegation, making it 
> > impossible to get more than a /64 of space since you can't request it.
> >
> > If you *do* have ひかり電話 then you are most likely using a NTT 
> > provided HGW (ONU + router) and the HGW, although it can request and 
> > receive a /56, *still* only advertises a /64 to the locally connected 
> > network.
> >
> > Does this situation sound familiar to you guys?
> >
> > Has anyone got a way to reliably get a /56 via IPoE?
> >
> > I'm starting to think that the only way to reliably get a /56 is to 
> > use PPPoE which kind of sounds crazy ... but then again, welcome to 
> > Japan.
> >
> > Thanks for any good info you can provide.
> >
> > Tod


--
_ // Bernie Innocenti
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