ISC DHCP

Overview

ISC DHCP offers a complete open source solution for implementing DHCP servers.

Setup

This setup guide will show you how to forward logs produced by your DHCP servers to SEKOIA.IO by means of an rsyslog transport channel.

1. Download the certificate

In order to allow the connection of your rsyslog server to the SEKOIA.IO intake, please download the SEKOIA.IO intake certificate: On most linux servers, two packages need to be installed: rsyslog and rsyslog-gnutls.

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$ wget -O /etc/rsyslog.d/SEKOIA-IO-intake.pem https://app.sekoia.io/assets/files/SEKOIA-IO-intake.pem

2. Configure the Rsyslog server

Open or create a new DHCP configuration file for rsyslog:

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sudo vim /etc/rsyslog.d/39-dhcp.conf

Paste the following rsyslog configuration to trigger the emission of DHCP logs by your rsyslog server to SEKOIA.IO:

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# Define the SEKIOA-IO intake certificate
$DefaultNetstreamDriverCAFile /etc/rsyslog.d/SEKOIA-IO-intake.pem

# Configure up the network ssl connection
$ActionSendStreamDriver gtls # use gtls netstream driver
$ActionSendStreamDriverMode 1 # require TLS for the connection
$ActionSendStreamDriverAuthMode x509/name # server is authenticated

# Template definition [RFC5424](https://tools.ietf.org/html/rfc5424#section-7.2.2)
# IMPORTANT: don't forget to set your intake key in the template
template(name="SEKOIAIOdhcpTemplate" type="string" string="<%pri%>1 %timestamp:::date-rfc3339% %hostname% %app-name% %procid% LOG [SEKOIA@53288 intake_key=\"YOUR_INTAKE_KEY\"] %msg%\n")

# Send your events to SEKOIA.IO intake servers under SEKOIAIODhcpdTemplate template
if $programname startswith 'dhcpd' then @@(o)intake.sekoia.io:10514;SEKOIAIOdhcpTemplate

In the above template instruction, replace YOUR_INTAKE_KEY variable with your intake key.

3. Restart rsyslog

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$ sudo service rsyslog restart

4. Enjoy your events

Go to the events page to watch your incoming events.