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: https://linux.die.net/man/8/dhcrelay
| Tag | Description |
|---|---|
| Latest | Latest release built upon the latest version. |
| 4.4.x | Versioned release. |
In this config, udp port 67 must be free on the host.
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"] #https://fedoramagazine.org/build-network-bridge-fedora/
cap_add:
- NET_ADMIN
network_mode: host
restart: always
mem_limit: 20m
mem_reservation: 5mhttps://linux.die.net/man/8/dhcrelay
-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.