Can't add DHCP Sensor - The device needs a static IP

Hi Reynaldo,

Did you make sure the static IP is configured directly in the network interface of the Probe running the sensor (not like "static" in the sense of "gets always same IP by DHCP")?

Kind regards.

Hi Erhard

Thank you for your reply. Yes my server is configured with static IP directly in the network.

I don't know if this is a relevant information, but both server (PRTG and DHCP) are virtual machines. I double check and both server are configured with static IP.

Best regards.

Hi Reynaldo,

• Do you get this error when adding the sensor or later (after first scan)?
• Could you please post the output of ipconfig /all from the Probe running the sensor (=PRTG Core Server or Remote Probe if applicable)?
• Does the Probe-VM run on the same Hyper-V host as the DHCP-VM?
• How many virtual switches are assigned to the Probe-VM?

You can also write us an email with those details, if you like ([email protected]). Make sure to mention this KB post in your email and put (Case PAE660046) in the subject (our internal Ticket-ID for this post).

Kind regards.

Hi Erhard,

I'm getting this error when I try to add the sensor. PRTG don't let me add for first scan.

ipconfig /all from PRTG Server: Windows IP Configuration

Host Name: BR-PRTG

Primary Dns Suffix: br.undp.local

Node Type: Hybrid

IP Routing Enabled: No

WINS Proxy Enabled: No

DNS Suffix Search List: br.undp.local

Ethernet adapter Ethernet 2:

Connection-specific DNS Suffix:

Description : Microsoft Hyper-V Network Adapter #2

Physical Address: 00-15-5D-78-10-06

DHCP Enabled: No

Autoconfiguration Enabled: Yes

IPv4 Address: 172.16.120.4(Preferred)

Subnet Mask: 255.255.254.0

Default Gateway: 172.16.120.1

DNS Servers: 172.16.120.5, 172.16.120.6

NetBIOS over Tcpip: Enabled

----------------

ipconfig /all DHCP Server: Windows IP Configuration

Host Name: BR-NAP

Primary Dns Suffix: br.undp.local

Node Type: Hybrid

IP Routing Enabled: No

WINS Proxy Enabled: No

DNS Suffix Search List: br.undp.local

Ethernet adapter Ethernet:

Connection-specific DNS Suffix:

Description: Microsoft Hyper-V Network Adapter

Physical Address: 00-15-5D-78-CB-10

DHCP Enabled: No

Autoconfiguration Enabled: Yes

IPv4 Address: 172.16.120.13(Preferred)

Subnet Mask: 255.255.254.0

Default Gateway: 172.16.120.1

DNS Servers: 172.16.120.5, 172.16.120.6

NetBIOS over Tcpip: Enabled

---------------------

Probe-VM and DHCP-VM are running from different servers and there is only one Virtual Switch

Best regards, Reynaldo

Hi Reynaldo,

I also received your email, I talk to one of the developers about this and get back to you (by email) as soon as I know more.

Kind regards.

Hi

Did this get resolved? I'm getting the same error and have a static assigned to probe machine.

Are you trying to add the DHCP sensor to a device on your probe or the probe itself? The sensor only works directly on probe devices. That turned out to be the problem :)

Hello,

i'm facing the same issue within same platform, same outputs as Reynaldo did. Could you give me some idea how to fix it ?

More than one active network card (HyperV, Docker, etc.) on the target server that is a DHCP server?

Kind regards,
Stephan Linke, Tech Support Team