---
### Author:  [@nirolo](https://discourse.pi-hole.net/u/nirolo)
#### Post date: [March 18, 2019, 9:00am UTC](https://discourse.pi-hole.net/t/pi-hole-cannot-be-found/17889/6 "2019-03-18T09:00:17Z")
nmap dhcp-discover result:
```auto
sudo nmap -sU -p67 --script dhcp-discover 192.168.11.1
Starting Nmap 7.40 ( https://nmap.org ) at 2019-03-18 08:55 GMT
Nmap scan report for 192.168.11.1
Host is up (-0.19s latency).
PORT STATE SERVICE
67/udp open|filtered dhcps
MAC Address: XX:24:XX:BC:39:XX (Buffalo.inc)
Nmap done: 1 IP address (1 host up) scanned in 12.47 seconds
```
[Debug token](https://tricorder.pi-hole.net/7e05hnwn9z!)
There are queries showing in the admin panel query log.
---
### Author:  [@deHakkelaar](https://discourse.pi-hole.net/u/deHakkelaar)
#### Post date: [March 18, 2019, 12:33pm UTC](https://discourse.pi-hole.net/t/pi-hole-cannot-be-found/17889/7 "2019-03-18T12:33:19Z")
I am not sure why `nmap` isnt able to capture DHCP from your router.
Could be some safety mechanism on the router.
If others dont provide a solution, my advice would be to disable the DHCP service on the router and enable it on Pi-hole:
> [@How do I use Pi-hole's built in DHCP server (and why would I want to)?](https://discourse.pi-hole.net/t/how-do-i-use-pi-holes-built-in-dhcp-server-and-why-would-i-want-to/3026):
>
> Using Your Existing Router For Network-wide Ad Blocking You might not need to use Pi-hole's DHCP server: In many home environments, your router also functions as your DHCP server. In this case, you can often [set Pi-hole to be the DNS server for your network clients in the router's DHCP (or LAN) settings page](https://discourse.pi-hole.net/t/how-do-i-configure-my-devices-to-use-pi-hole-as-their-dns-server/245), which allows all of your network clients to block ads simply by connecting to the network. Setting it up this way is also what makes Pi-hole very powerful for network-wide ad blocking. W…
---
### Author:  [@nirolo](https://discourse.pi-hole.net/u/nirolo)
#### Post date: [March 20, 2019, 2:44pm UTC](https://discourse.pi-hole.net/t/pi-hole-cannot-be-found/17889/8 "2019-03-20T14:44:05Z")
Well then I'll probably have to
- either set the pi manually as my DNS server on each device
- wait for a new router
- find out why it worked for one day
I can't disable DHCP in the router 😕
Thanks nevertheless for your efforts!
---
### Author:  [@deHakkelaar](https://discourse.pi-hole.net/u/deHakkelaar)
#### Post date: [March 20, 2019, 3:50pm UTC](https://discourse.pi-hole.net/t/pi-hole-cannot-be-found/17889/9 "2019-03-20T15:50:55Z")
> [@nirolo](#):
>
> I can’t disable DHCP in the router 😕
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### Author:  [@jfb](https://discourse.pi-hole.net/u/jfb)
#### Post date: [March 20, 2019, 6:04pm UTC](https://discourse.pi-hole.net/t/pi-hole-cannot-be-found/17889/10 "2019-03-20T18:04:17Z")
> [@nirolo](#):
>
> I can’t disable DHCP in the router
If you cannot disable DHCP on the router, then change the range of DHCP on the router to one IP address, the IP of the Pi-Hole. Then enable DHCP on the Pi-Hole and assign the range outside the IP of the Pi-Hole.
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### Author:  [@nirolo](https://discourse.pi-hole.net/u/nirolo)
#### Post date: [March 22, 2019, 12:01pm UTC](https://discourse.pi-hole.net/t/pi-hole-cannot-be-found/17889/11 "2019-03-22T12:01:06Z")
🙄 whoops. Thanks!
---
### Author:  [@nirolo](https://discourse.pi-hole.net/u/nirolo)
#### Post date: [March 22, 2019, 12:28pm UTC](https://discourse.pi-hole.net/t/pi-hole-cannot-be-found/17889/12 "2019-03-22T12:28:36Z")
So, after a bit more trial and error I figured a way out to get it working again:
1. The pi-hole has to be up & running
2. The router has to be restarted
(in this order!)
It seems as if the the router is up while the pi-hole goes down it relies on a backup DNS that I cannot see or configure via the interface. If the pi-hole gets back up it does not switch to it as DNS server (even if I update the setting for the DNS server IP address). However, restarting the router does the job.
Thanks for all your help so far!
---
### Author:  [@system](https://discourse.pi-hole.net/u/system)
#### Post date: [April 12, 2019, 12:28pm UTC](https://discourse.pi-hole.net/t/pi-hole-cannot-be-found/17889/13 "2019-04-12T12:28:39Z")
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