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Re: [connect-wg] [anti-abuse-wg] Input request for system on how to approach abuse filtering on Route Servers - bad hosters

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Erik Bais

2021-05-20 15:21:51 CET

Hi Michele,

I’m not looking at tapping traffic, nor would I expect an IXP to do so.

There are other sources that we should look at to get the data.


From: Michele Neylon - Blacknight <michele _at_ blacknight _dot_ com>
Date: Thursday 20 May 2021 at 10:03
To: Erik Bais <ebais _at_ a2b-internet _dot_ com>, Thomas King <thomas.king _at_ de-cix _dot_ net>, Erik Bais <erik _at_ bais _dot_ name>, "connect-wg _at_ ripe _dot_ net" <connect-wg _at_ ripe _dot_ net>, "anti-abuse-wg _at_ ripe _dot_ net" <anti-abuse-wg _at_ ripe _dot_ net>
Subject: Re: [anti-abuse-wg] Input request for system on how to approach abuse filtering on Route Servers - bad hosters


But wouldn’t creating this list involve looking at the traffic *somewhere*?

Personally I’d love to see scummy providers marginalised as much as possible, but the “how” is important to get right.



Mr Michele Neylon
Blacknight Solutions
Hosting, Colocation & Domains
Intl. +353 (0) 59  9183072
Direct Dial: +353 (0)59 9183090
Personal blog:
Some thoughts:
Blacknight Internet Solutions Ltd, Unit 12A,Barrowside Business Park,Sleaty
Road,Graiguecullen,Carlow,R93 X265,Ireland  Company No.: 370845

From: anti-abuse-wg <anti-abuse-wg-bounces _at_ ripe _dot_ net> on behalf of Erik Bais <ebais _at_ a2b-internet _dot_ com>
Date: Wednesday 19 May 2021 at 13:00
To: Thomas King <thomas.king _at_ de-cix _dot_ net>, Erik Bais <erik _at_ bais _dot_ name>, "connect-wg _at_ ripe _dot_ net" <connect-wg _at_ ripe _dot_ net>, "anti-abuse-wg _at_ ripe _dot_ net" <anti-abuse-wg _at_ ripe _dot_ net>
Subject: Re: [anti-abuse-wg] Input request for system on how to approach abuse filtering on Route Servers - bad hosters

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Hi Thomas,

Thank you for your reply and insight.

I’m not asking for IXP’s to look in the traffic.. I’m looking for a top 50 list of badhosts.. that is generated in a way that we as a community would feel comfortable with as a start.
Use that top 50 list .. as the ASn filtering, to get to a way of clean internet for the default Routeserver customer. ( secure by design / default )

If that customer would like to receive the unfiltered option, they could set that via the IXP portal in their member account and receive the unfiltered view. Or setup direct peerings ..

It is already possible to do this for someone if they know how to do it, via BGP communities or RPSL in the RIPE DB..
But the problem is that the list might not get updated .. and it is easier to do this for the whole group with regular updates, without re-configing all routers on a peering lan.

As we are now talking about this in the Dutch community, it should be possible to push this also to other regions .. and it should be open for everyone to see why they would be listed and what the qualifiers are that they are there …

That way we can avoid the real badhosts to pick out an internet exchange that doesn’t support filtering on this, just so they can push their bad packets into some networks.

Erik Bais

From: anti-abuse-wg <anti-abuse-wg-bounces _at_ ripe _dot_ net> on behalf of Thomas King <thomas.king _at_ de-cix _dot_ net>
Date: Wednesday 19 May 2021 at 13:14
To: Erik Bais <erik _at_ bais _dot_ name>, "connect-wg _at_ ripe _dot_ net" <connect-wg _at_ ripe _dot_ net>, "anti-abuse-wg _at_ ripe _dot_ net" <anti-abuse-wg _at_ ripe _dot_ net>
Subject: Re: [anti-abuse-wg] Input request for system on how to approach abuse filtering on Route Servers - bad hosters

Hi Erik,

This is a vital topic! You focused a bit on the Dutch community. However, I think it is globally significant.

We at DE-CIX are very active in reacting to abusive peers on our IXPs. We have disconnected peers who were (repeatedly) not obeying the law or the DE-CIX Terms and Conditions. I gave a talk about what DE-CIX does in this regard during RIPE75 (

Disclaimer: I am not a lawyer.

The European telecommunication law does not allow IXPs to look into peers' traffic on the application level (for a good reason, I believe). So, we do not know if a peer hosts malware or is sending out spam only. DE-CIX is only allowed to look into the operational data (e.g., Route or ASN hijacks) or behavior (e.g., unwanted traffic due to static routes on the Peering LAN). Based on this information, DE-CIX is acting.

I am highlighting this because I see issues if IXPs (or carriers and transit providers) are used as central infrastructure to filter data due to information they cannot verify or generate. Just think about the central DNS filtering and censoring discussion we had on a European level to stop certain abusive and harmful Internet services from being accessible.

Best regards,

Dr. Thomas King
Chief Technology Officer (CTO)

DE-CIX Management GmbH | Lindleystraße 12 | 60314 Frankfurt am Main | Germany | |
Phone +49 69 1730902 87 | Mobile +49 175 1161428 | Fax +49 69 4056 2716 | thomas.king _at_ de-cix _dot_ netthomas.king _at_ de-cix _dot_ net> |
Geschaeftsfuehrer Harald A. Summa and Sebastian Seifert | Registergericht AG Koeln HRB 51135

DE-CIX 25th anniversary: Without you the Internet would not be the same!
Join us on the journey at

From: connect-wg <connect-wg-bounces _at_ ripe _dot_ netconnect-wg-bounces _at_ ripe _dot_ net>> On Behalf Of Erik Bais
Sent: Tuesday, 18 May 2021 21:52
To: connect-wg _at_ ripe _dot_ netconnect-wg _at_ ripe _dot_ net>; anti-abuse-wg _at_ ripe _dot_ netanti-abuse-wg _at_ ripe _dot_ net>
Subject: [connect-wg] Input request for system on how to approach abuse filtering on Route Servers - bad hosters


As I asked during the Connect WG today, there are discussions currently going on in the Dutch network community to see if there is a way to get a cleaner feed from routeservers on internet exchanges. ( by default )

As you may know there is an Dutch Anti Abuse Network initiative ( AAN ) –

The companies associated with AAN setup and all signed a manifest ( in Dutch -  ) that states that we will all do our best to provide a better and cleaner internet.

As members of the member organisation of the largest Internet Exchange, AMS-IX, we like to start with the discussion on asking the AMS-IX to filter certain AS numbers from the default routeserver view.
The issue is that even if you don’t peer with certain networks directly, the change is very real that you will receive or that the other network receive your prefixes and that you may not want to peer with those networks.

What we like to have is an independent way of generating a list with badhosts ( say a top 50 ) .. ( and with our Dutch infrastructure we have a couple on the Dutch infrastructure as well.. )

A couple years ago there was the list of HostExploit .. or one could have a look at the drop-list of SH ..
Personally I would like a proper model that one can explain why a certain network is listed on a certain list with a clear method explaining of what kind of abuse is noted in the said network.

Topics that should be included on the rating for the list :

  *   Phishing (hosting sites / domain registrations )
  *   Malware hosting ( binaries and C&C’s )
  *   DDOS traffic  ( number of amplification devices in the network compared to the number of IP address ratio )
  *   Login attacks / excessive port scanning
  *   Hosting of Child exploitation content
  *   Infected websites / Zeus Botnets
  *   Etc

So yeah, something similar as the Top 50 of HostExploit ranking .. but HostExploit stopped producing these lists in 2014.

By filtering a top 50 of badness hosters on the Routeservers would remove the cheap IXP option for network connectivity at the better Internet Exchanges and provide a way to remove any DDOS traffic via BGP null-routing via Transits.
And companies that would still want to peer with a certain network, can still do so by direct peering setup via the IXP infra.

And it will not bring the IXP in a position where it will be asked on why they are still offering services to certain parties .. as that might become legally difficult especially in a membership organisation.

So we don’t mind if we take their money as long as are not forced to peer with them via the routeservers.

Your constructive feedback is highly appreciated.

Erik Bais
A2B Internet