Hi community,
The server I have Pi-hole installed on has two network interfaces: 192.168.1.0/24 and 192.168.2.0/24. I'd like it to work as DHCP server for both networks, providing the addresses from respective ranges. I know how to do that in DNSMASQ, but haven't found any obvious option in Pi-hole GUI. Can anyone please send me to the right direction?
Yes, I've seen that. What Pi-hole is using for DHCP behind the hood? Would it be possible to update those configs manually to support this scenario?
dnsmasq config files, more precisely: /etc/dnsmasq.d/02-pihole-dhcp.conf, but the files are automatically populated by Pi-hole web interface. Changes will be lost.
Thank you! Is there any way to add an extra config file for this scenario?
I havent tried it myself and there was no reply on below suggestion that I think could work:
Tail the logs live to see whats happening when you connect a device to either segments:
sudo tail -F /var/log/pihole/pihole.log | grep dnsmasq-dhcp
EDIT: Oh I noticed you'd might want to advertise a different router IP for the second subnet.
Then it should be below if eth1 were the second interface name ... as an example:
$ sudo nano /etc/dnsmasq.d/99-my-dhcp.conf
# Subnet network2.dehakkelaar.nl
domain=network2.dehakkelaar.nl,192.168.2.0/24,local
dhcp-range=eth1,192.168.2.50,192.168.2.250,24h
dhcp-option=eth1,option:router,192.168.2.1
thanks! Will try and let you know
I created a virtual eth1 dummy interface to test 
$ sudo modprobe dummy
$
$ lsmod
Module Size Used by
dummy 16384 0
$ sudo ip link add eth1 type dummy
$
$ sudo ip address add 192.168.2.2/24 dev eth1
$
$ sudo ip link set eth1 up
$
$ ip -br -4 address show scope global
eth0 UP 10.0.0.2/24
eth1 UNKNOWN 192.168.2.2/24
$ sudo pihole-FTL dhcp-discover
Scanning all your interfaces for DHCP servers
Timeout: 10 seconds
* Received 327 bytes from eth1:192.168.2.2
Offered IP address: 192.168.2.183
Server IP address: 192.168.2.2
Relay-agent IP address: N/A
BOOTP server: (empty)
BOOTP file: (empty)
DHCP options:
Message type: DHCPOFFER (2)
server-identifier: 192.168.2.2
lease-time: 86400 ( 1d )
renewal-time: 43200 ( 12h )
rebinding-time: 75600 ( 21h )
netmask: 255.255.255.0
broadcast: 192.168.2.255
domain-name: "network2.dehakkelaar.nl"
router: 192.168.2.1
dns-server: 192.168.2.2
--- end of options ---
* Received 318 bytes from eth0:10.0.0.2
Offered IP address: 10.0.0.33
Server IP address: 10.0.0.2
Relay-agent IP address: N/A
BOOTP server: (empty)
BOOTP file: (empty)
DHCP options:
Message type: DHCPOFFER (2)
server-identifier: 10.0.0.2
lease-time: 86400 ( 1d )
renewal-time: 43200 ( 12h )
rebinding-time: 75600 ( 21h )
netmask: 255.255.255.0
broadcast: 10.0.0.255
domain-name: "home.dehakkelaar.nl"
dns-server: 10.0.0.2
router: 10.0.0.1
--- end of options ---
DHCP packets received on interface eth1: 1
DHCP packets received on interface lo: 0
DHCP packets received on interface eth0: 1
Legend!
Other DHCP server options that can be advertised:
$ pihole-FTL --list-dhcp4
Known DHCP options:
1 netmask
2 time-offset
3 router
6 dns-server
7 log-server
9 lpr-server
13 boot-file-size
15 domain-name
16 swap-server
17 root-path
18 extension-path
19 ip-forward-enable
20 non-local-source-routing
21 policy-filter
22 max-datagram-reassembly
23 default-ttl
26 mtu
27 all-subnets-local
31 router-discovery
32 router-solicitation
33 static-route
34 trailer-encapsulation
35 arp-timeout
36 ethernet-encap
37 tcp-ttl
38 tcp-keepalive
40 nis-domain
41 nis-server
42 ntp-server
44 netbios-ns
45 netbios-dd
46 netbios-nodetype
47 netbios-scope
48 x-windows-fs
49 x-windows-dm
58 T1
59 T2
60 vendor-class
64 nis+-domain
65 nis+-server
66 tftp-server
67 bootfile-name
68 mobile-ip-home
69 smtp-server
70 pop3-server
71 nntp-server
74 irc-server
77 user-class
80 rapid-commit
93 client-arch
94 client-interface-id
97 client-machine-id
100 posix-timezone
101 tzdb-timezone
108 ipv6-only
119 domain-search
120 sip-server
121 classless-static-route
125 vendor-id-encap
150 tftp-server-address
255 server-ip-address
This topic was automatically closed 7 days after the last reply. New replies are no longer allowed.