Should I tag my blackholes with (0:$ROUTE-SERVER-AS)?
No. This would have the same effect as NO-EXPORT/NO-ADVERTISE as you instruct the route servers to not advertise your prefix(es) to any peers.
Should I tag my blackholes with well-known BGP communities NO-EXPORT and/or NO-ADVERTISE?
No. The route servers honor these communities and will not pass on your announcements at all. The route servers will automatically add NO-EXPORT to all blackholes before exporting them to other peers.
I’ve announced blackholes to the route servers, why am I still receiving malicious traffic?
Please check if your blackhole announcement has been accepted by the route servers. You can check this in the DE-CIX Looking Glass. By entering the blackhole prefix into the global search field, you can get an overview of the networks announcing this blackhole prefix, as well as the route servers and therewith the exchanges where the prefix…
I have announced blackholes to direct peers, why do I still receive malicious traffic?
Many peers do not accept IPv4 prefixes more specific than /24 and IPv6 prefixes more specific than /48. Please ask your peers to accept more specific prefixes.
How specific can the advertised blackhole be?
The blackhole can be as specific as /32 (IPv4) or /128 (IPv6).
How many blackholes can I advertise?
The amount of blackholes is included in the maximum number of allowed prefixes. This means: (standard prefixes + blackholes) < maxpref.
What is blackhole?
A blackhole is a prefix for which all destination traffic will be discarded.
What is Blackholing?
Blackholing is a security measure for protecting a network against a Distributed Denial of Service (DDoS) attack. The method allows packets to a specific network to be “dropped” so that they do not reach the recipient and overload their resources. The network under attack can announce the affected prefixes as blackholes by using the BGP BLACKHOLE…
How to decide where to peer?
Peering offers many benefits, and in general, looking at both quality and costs, it makes sense to peer. But at which Internet Exchange? This question pops up soon after you’ve decided to peer. The criteria you should take into consideration are outlined here.
How do I find an AS I to peer with?
If you want to know which networks you can reach at our locations, you can search for a company name or AS number or you can check the list of connected networks for each location directly. Although more than 2,000 networks peer at DE-CIX’s exchanges, not all ASNs are available. Do you have an ASN you would like to peer…
What is PeeringDB
PeeringDB is a nonprofit, member-based organization that facilitates the exchange of user maintained interconnection information, primarily for peering coordinators and Internet Exchange, facility, and network operators. Having a well maintained PeeringDB entry is a must-have for all networks engaged in interconnection, especially for all peering administrators. It gives you information about networks and shows other networks…
What is BGP?
Border Gateway Protocol (BGP) is a routing protocol designed to exchange routing and reachability information between Autonomous System (AS) networks. BGP manages how data gets delivered between networks. AS networks have BGP-speaking routers that advertise or announce to other BGP-speaking routers they are connected to (called neighbors) the prefixes of IP addresses that they can…
