Web Interface not reachable with pi.hole

Help
14

"IP Address Lease Reservation" is not the same as assigning a "static IP address".
The first is really a reservation for clients that are configured to get IP details automatically via DHCP.
The later can only be configured on the client itself and if set, makes this device IP settings independent from DHCP.

When you run the Pi-hole installer, it will install the software package dhcpcd5 (if not installed already) to deal with network settings and applying them:

pi@noads:~ $ apt policy dhcpcd5
dhcpcd5:
  Installed: 1:6.11.5-1+rpt7
  Candidate: 1:6.11.5-1+rpt7
[..]

pi@noads:~ $ apt show dhcpcd5
[..]
Description: DHCPv4, IPv6RA and DHCPv6 client with IPv4LL support
 dhcpcd is a one stop network management daemon which includes
  * RFC compliant DHCPv4 and DHCPv6 clients
  * DHCPv6 Prefix Delegation support
  * IPv4LL (aka ZeroConf) support
  * ARP address conflict resolution
  * Link carrier detection
  * Wireless SSID profiles
  * ARP ping profiles

The installer also tries to set a static IP on the box thats running Pi-hole:

pi@noads:~ $ tail /etc/dhcpcd.conf
[..]
interface eth0
  static ip_address=10.0.0.2/24
  static routers=10.0.0.1
  static domain_name_servers=127.0.0.1

During boot, this is what happens:

pi@noads:~ $ journalctl -u dhcpcd
[..]
Sep 08 22:28:43 noads.dehakkelaar.nl systemd[1]: Starting dhcpcd on all interfaces...
Sep 08 22:28:43 noads.dehakkelaar.nl dhcpcd[30082]: dev: loaded udev
Sep 08 22:28:43 noads.dehakkelaar.nl dhcpcd[30082]: DUID xx:xx:xx
Sep 08 22:28:43 noads.dehakkelaar.nl dhcpcd[30082]: eth0: IAID xx:xx:xx:xx
Sep 08 22:28:43 noads.dehakkelaar.nl dhcpcd[30082]: eth0: using static address 10.0.0.2/24
Sep 08 22:28:43 noads.dehakkelaar.nl dhcpcd[30082]: eth0: adding route to 10.0.0.0/24
Sep 08 22:28:43 noads.dehakkelaar.nl dhcpcd[30082]: eth0: adding default route via 10.0.0.1
Sep 08 22:28:43 noads.dehakkelaar.nl dhcpcd[30082]: forked to background, child pid 30098
Sep 08 22:28:43 noads.dehakkelaar.nl systemd[1]: Started dhcpcd on all interfaces.
Sep 08 22:28:43 noads.dehakkelaar.nl dhcpcd[30098]: eth0: soliciting an IPv6 router
Sep 08 22:28:55 noads.dehakkelaar.nl dhcpcd[30098]: eth0: no IPv6 Routers available

When you run sudo dhclient eth0 , it probably discards the active static IP configuration and tries to acquire IP details via DHCP for the given interface.
This is totaly unnecessary as Pi-hole is suppose to have a static IP assigned and not acquiring via DHCP.

Back to the issue of pi.hole not resolving on the clients, better post screenshots here from your router's DNS and DHCP settings for us to have a look.
Or Switch off DHCP service on the router and enable DHCP service on Pi-hole as a replacement:

1 Like