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58 lines
2.2 KiB
Markdown
58 lines
2.2 KiB
Markdown
---
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title: "DHCP for Raspberry Pi"
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date: 2021-02-15T22:46:21-05:00
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draft: false
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tags: ["Networking"]
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---
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Recently I ran across the use case where I needed a Raspberry Pi to be connected to the Internet via a WiFI connection, while also providing DHCP leases through an Ethernet connection. I couldn't find a great way to achieve this with `dhcpcd` so instead I grabbed a tool that I'm more familiar with `dnsmasq`.
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Before we begin, we need to setup a static IP for the Ethernet interface (`eth0`). Since the Ethernet interface will not be connected to the Internet, there's no need to worry about a lot of the usual fields.
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In `/etc/dhcpcd.conf`
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```
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interface eth0
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fallback nodhcp
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profile nodhcp
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static ip_address=192.168.2.1/24
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```
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Below is the config for `dnsmasq` which lives in `/etc/dnsmasq.conf`. It essentially tells it to only serve DHCP leases on the Ethernet connection of the Raspberry Pi. The addresses it'll lease out according to the config below is between 192.168.0.50-192.168.0.150 and is leased for 12 hours.
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```
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# Configuration file for dnsmasq.
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#
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# Format is one option per line, legal options are the same
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# as the long options legal on the command line. See
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# "/usr/sbin/dnsmasq --help" or "man 8 dnsmasq" for details.
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# Listen on this specific port instead of the standard DNS port
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# (53). Setting this to zero completely disables DNS function,
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# leaving only DHCP and/or TFTP.
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port=0
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# If you want dnsmasq to listen for DHCP and DNS requests only on
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# specified interfaces (and the loopback) give the name of the
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# interface (eg eth0) here.
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# Repeat the line for more than one interface.
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interface=eth0
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# Or you can specify which interface _not_ to listen on
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#except-interface=
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# Or which to listen on by address (remember to include 127.0.0.1 if
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# you use this.)
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#listen-address=
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# Uncomment this to enable the integrated DHCP server, you need
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# to supply the range of addresses available for lease and optionally
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# a lease time. If you have more than one network, you will need to
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# repeat this for each network on which you want to supply DHCP
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# service.
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dhcp-range=192.168.0.50,192.168.0.150,12h
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# Enable DHCPv6. Note that the prefix-length does not need to be specified
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# and defaults to 64 if missing/
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#dhcp-range=1234::2, 1234::500, 64, 12h
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```
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