---
title: "RTBH Method Settings"
slug: "rtbh-method-settings"
description: "Learn how to configure RTBH mitigation settings in Kentik, including community management, next-hop IPs, and local preferences for effective routing."
updated: 2026-03-20T17:30:39Z
published: 2026-03-20T17:30:39Z
canonical: "kb.kentik.com/rtbh-method-settings"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://kb.kentik.com/llms.txt
> Use this file to discover all available pages before exploring further.

# RTBH Method Settings

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**](/v1/docs/manage-mitigations-1) page.

## RTBH Method Details

The **Details** tab of the settings dialog for an RTBH mitigation includes the following fields:

- ![Configuration details for Carpet Bomb RTBH method including community and next hop information.](https://cdn.us.document360.io/082e25b5-afce-42d4-8f47-70bd3f1d02b7/Images/Documentation/MM-edit-rtbh-method-details-tab.png)**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 `192.0.2.0/24` CIDR 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).

> [!NOTE]
> **Notes:**
> 
> - For more on RTBH, see [**Configuring RTBH Mitigation**](/v1/docs/configuring-rtbh), [**Mitigation Platforms**](/v1/docs/mitigation-platforms), and [**RTBH Mitigation**](/v1/docs/mitigation-overview#rtbh-mitigation).
> - For general method settings like notification channels and automation grace periods, return to the [**Mitigation Methods**](/v1/docs/mitigation-methods) article.