This article covers the specific configuration fields and settings required when building an RTBH (Remotely Triggered Black Hole) mitigation method from Kentik’s Manage Mitigations page.
RTBH Method Details
The Details tab of the settings dialog for an RTBH mitigation includes the following fields:
Commonly Used Communities (table): Provided for reference only, a list of communities commonly used in RTBH (you are not restricted to using one of these communities).Community to Advertise: The community that has been programmed on the customer’s router to induce a black hole next hop for the IPv4 address attached to the community.
Next Hop: Next-hop IP addresses (IPv4 and Ipv6). In some environments these will be the destination IP to blackhole. These numbers have traditionally been selected from the
192.0.2.0/24CIDR block, but may be any IP address.Local Preference: Set the priority for the RTBH route. A high setting helps ensure that when there is more than one route the RTBH route will be preferred by the BGP best path selection process.
Ensure at least/24: A switch that tells Kentik to convert the provided next-hop IP address to CIDR notation. Use if you plan to withdraw blocks from certain routers and re-advertise in other locations (otherwise, leave unchecked).
Notes:
For more on RTBH, see Configuring RTBH Mitigation, Mitigation Platforms, and RTBH Mitigation.
For general method settings like notification channels and automation grace periods, return to the Mitigation Methods article.