Agreed. This is a problem, and it has happened before. This is not the first time.
I asked Job Snijders (a maintainer of IRRExplorer) about it, and here's what he had to say. I don't think he should set an arbitrary threshold for excluding large prefixes from IRRExplorer. I think the prefix probably shouldn't be being advertised. But is there a technical distinction between this /3 and other advertisements aside from the size that could flag it for ignoring? ---------- Forwarded message --------- From: Job Snijders <[email protected]> Date: Fri, Oct 4, 2019 at 9:43 PM Subject: Re: IRR Eplorer weirdness 2000::/3 route? To: Billy Crook <[email protected]> On Fri, Oct 04, 2019 at 12:25:27PM -0500, Billy Crook wrote: > I'm seeing that all of 2000::/3 is being advertised by 24785. > > That can't be right, right? Maybe they're you're default upstream? I > didn't see this route in sprint's v6 looking glass, so I'm assuming > it's a local anomaly to your system. Yeah, from time to time people (usually by accident) leak very large blocks to route collectors. Often these blocks exist internal in networks as a replacement for default routes and are not meant to leak to the wider world, but you know how things go. Here you can see the source of that data: http://lg.ring.nlnog.net/prefix_detail/lg01/ipv6?q=2000::/3 I could make irrexplorer ignore such large announcements, but where to draw the line? On Wed, Nov 13, 2019 at 1:00 PM Douglas Fischer <[email protected]> wrote: > > I have been recommending to many friends to check in daily at > http://irrexplorer.nlnog.net/ to make sure everything is healthy with their > prefixes ... > > Today a colleague reported a problem with an AS58299 ad appearing in "their > prefixes". > I went look and was showing up on our ASNs too. > > It took me a while (dããã) to understand what was going on ... > Why was irrexplorer showing that prefix in our query? > > > Could anyone reach somebody from OpenFactory/NetShelter/level66network about > this? > > > > http://lg.ring.nlnog.net/prefix_bgpmap/lg01/ipv6?q=2000::/3 > > 2000::/3 > [LEVEL66NETWORK1 11:35:27 from 2a09:11c0::1] * (100/-) [AS58299i] > Type: BGP unicast univ > BGP.origin: IGP > BGP.as_path: 209844 49697 58299 > BGP.next_hop: 2a09:11c0::1 > BGP.local_pref: 100 > BGP.community: (49697,1000) (49697,1007) (49697,2302) > BGP.ext_community: (RPKI Origin Validation State: not-found) > BGP.large_community: (209844, 100, 13) > > > -- > Douglas Fernando Fischer > Engº de Controle e Automação
