modem7/dhcprelay Docker Image Overview

modem7/dhcprelay

modem7

Docker DHCP Relay

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ISC DHCP Relay Agent

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!["Buy Me A Coffee"]([***]

A simple ISC DHCP Relay Agent.

The Internet Systems Consortium DHCP Relay Agent, dhcrelay, provides a means for relaying DHCP and BOOTP requests from a subnet to which no DHCP server is directly connected to one or more DHCP servers on other subnets. It supports both DHCPv4/BOOTP and DHCPv6 protocols.

More info can be found here: [***]

Tag	Description
Latest	Latest release built upon the latest version.
4.4.x	Versioned release.

Configuration

In this config, udp port 67 must be free on the host.

bash
version: "2.4"

services:

 #############
 ##DHCPRelay##
 #############
 
 #DHCPRelay - DHCP Relay between host network and Docker bridge
  dhcprelay:
    image: modem7/dhcprelay:latest
    container_name: DHCPRelay
    command: ["-id", "eno1", "-iu", "br_pihole", "172.33.0.100"] #[***]
    cap_add:
      - NET_ADMIN
    network_mode: host
    restart: always
    mem_limit: 20m
    mem_reservation: 5m

Commands explanation

[***]

bash
-i ifname
Listen for DHCPv4/BOOTP queries on interface ifname. Multiple interfaces may be specified by using more than one -i option. If no interfaces are specified on the command line, dhcrelay will identify all network interfaces, eliminating non-broadcast interfaces if possible, and attempt to listen on all of them.

-d
Force dhcrelay to run as a foreground process. Useful when running dhcrelay under a debugger, or running out of inittab on System V systems.

eno1
Your NIC (you can find this with ifconfig -a)

-u [address%]ifname
Specifies the ''upper'' network interface for DHCPv6 relay mode: the interface to which queries from clients and other relay agents should be forwarded. At least one -u option must be included in the command line when running in DHCPv6 mode. The interface name ifname is a mandatory parameter. The destination unicast or multicast address can be specified by address%; if not specified, the relay agent will forward to the DHCPv6 All_DHCP_Relay_Agents_and_Servers multicast address.

br_pihole
Your Docker network bridge name.

172.33.0.100
The destination IP address for the packets. Typically your PiHole bridge IP address.

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