Re: Newbie Needs Help: someone is announcing less-specific IPv6 (BGP) route on top of me

[Mel Beckman via NANOG <nanog () lists nanog org>]

As long as you advertise more specific routes, your routes will always win. So not a problem that I can see.

 -mel

> On Aug 30, 2025, at 5:57 AM, Tom Beecher via NANOG <nanog () lists nanog org> wrote:
>
> According to RIPEStat, 2400::/12 hasn't been seen since Oct 2023, from
> AS13030 (Init7).
>
> I also cannot seem to see any recent announcement of that anywhere in the
> usual sources, or my internal data. I would say this was an error on
> Qrator's part.
>
> In that case, what more do I must do?
>
>
> Although it didn't seem to happen here, best practice is to always announce
> 100% of your allocated IPs at all times.  This provides protection against
> someone announcing an umbrella and pulling traffic for any uncovered space.
> It's not perfect , but protects against general stupid.
>
> > On Sat, Aug 30, 2025 at 2:59 AM Pirawat WATANAPONGSE via NANOG <
> > nanog () lists nanog org> wrote:
> >
> > Dear Gurus,
> >
> >
> > Radar tool by Qrator [Reference: https://radar.qrator.net ] claims that
> > Zenlayer Inc. [AS4229] is “umbrella-ing” me by announcing ‘2400::/12’ on
> > top of my more-specific address block.
> > The tool classifies it as a type of hijacking.
> > [Disclaimer: apologies to Zenlayer if you didn’t do it; but that’s the
> > information I received]
> > My neighboring organization also has a more-specific block that falls under
> > The Umbrella too.
> >
> > However, other tools (https://stat.ripe.net ,
> > https://irrexplorer.nlnog.net
> > , https://bgp.he.net , etc.) seem unable to see that particular
> > announcement.
> >
> > Questions:
> > 1. Is Qrator claim true? (because I have already tried but cannot verify)
> > 2. If so, should I be concerned?
> > Even though I already ROA-ed *and* IRR-ed my own block, but if “the other
> > end” doesn’t validate, it won’t do any good, correct?
> > (Oh, yeah, the other end also has to somehow “not see” my longer-prefix.
> > But that can happen as well, no?)
> > 3. In that case, what more do I must do?
> >
> > I would extremely appreciate someone helping me out on this matter.
> >
> >
> > Best Regards,
> >
> > Pirawat.
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> >
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