# DHCP assignment issue with only certain devices

**URL:** <https://discourse.pi-hole.net/t/dhcp-assignment-issue-with-only-certain-devices/37812>\
**Category:** Community Help\
**Created:** [August 30, 2020, 7:20pm UTC](https://discourse.pi-hole.net/t/dhcp-assignment-issue-with-only-certain-devices/37812 "2020-08-30T19:20:32Z")\
**Posts on this page:** 1\
**Showing post:** 2

<div class="post-metadata">

**Author:** ![deHakkelaar](https://discourse-cdn.pi-hole.net/user_avatar/discourse.pi-hole.net/dehakkelaar/32/674_2.png) [@deHakkelaar](https://discourse.pi-hole.net/u/deHakkelaar)\
**Post date:** [August 30, 2020, 7:54pm UTC](https://discourse.pi-hole.net/t/dhcp-assignment-issue-with-only-certain-devices/37812/2 "2020-08-30T19:54:44Z")

</div>

Make sure no other DHCP server is active on your network!  
You could also check with below:

```auto
pi@ph5:~ $ ip -br -4 a s eth0
eth0 UP 10.0.0.4/24

```

* * *

```auto
pi@ph5:~ $ sudo nmap -e eth0 --script broadcast-dhcp-discover
Starting Nmap 7.70 ( https://nmap.org ) at 2020-08-30 21:42 CEST
Pre-scan script results:
| broadcast-dhcp-discover:
| Response 1 of 1:
| IP Offered: 10.0.0.29
| DHCP Message Type: DHCPOFFER
| Server Identifier: 10.0.0.4
| IP Address Lease Time: 2m00s
| Renewal Time Value: 1m00s
| Rebinding Time Value: 1m45s
| Subnet Mask: 255.255.255.0
| Broadcast Address: 10.0.0.255
| Domain Name Server: 10.0.0.4
| Domain Name: dehakkleaar.nl
|_ Router: 10.0.0.1
WARNING: No targets were specified, so 0 hosts scanned.
Nmap done: 0 IP addresses (0 hosts up) scanned in 2.89 seconds

```

You can install `nmap` on the Pi-hole host with below:

`sudo apt install nmap`

You might also want to redact the MAC addresses from the `tail` output you posted above.  
We are only interested in the first three octets eg. `c8:3d:fc:xx:xx:xx` that define the vendor:

```auto
pi@ph5:~ $ sqlite3 /etc/pihole/macvendor.db "SELECT mac,vendor FROM macvendor WHERE mac LIKE 'c8:3d:fc'"
C8:3D:FC|AlphaTheta Corporation

```

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_[View the full topic](https://discourse.pi-hole.net/t/dhcp-assignment-issue-with-only-certain-devices/37812)._