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Windows Server - DHCP IP Reservations issue

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IanJ:
Wierd issue (for me!) in relation to my newly set up Windows Server DHCP IP reservations.

Basically, I am binding MAC addresses to IP's for the devices I cannot set a fixed IP on.
One such device is my Bosch Solar Inverter.

Logging into the Bosch unit the MAC address is displayed in the config - CHECK
Running CMD line arp -a 192.168.1.138 I get the same MAC address - CHECK

However, Windows Server DHCP reservation doesn't work, the Bosch always picks up a new dynamic IP address instead of the reserved one......!
So, instead of setting up a manual reservation I let it get a new dynamic IP address and right clicked the new lease and chose 'Add To Reservation'.
Viewing the MAC address there is some 32 character hex string instead of the usual shorter format.
From there though the reservation with that MAC address works perfectly, and so I asked Chat GPT what was this all about:

ChatGPT:
The address seems to be a hexadecimal representation of ASCII characters
So, for example the first two numbers of the MAC address it should be "00:60......"
But the string shows "302d3630......"

30 = 0
2d = -
36 = 6
30 = 0

It looks like the MAC address of the Bosch inverter is being reported in an unusual way.

Wierd, but at least it now works. Just wondered if this is really an unusual issue or if it's quite common etc.

Ian.

eutectique:
What does ipconfig report back?

Edit: ipconfig /all is even better.

jc101:
That sounds like an IPv6 address, which is 32 hex digits long.

Do you have IPv6 enabled on any of the boxes?

IanJ:

--- Quote from: jc101 on November 20, 2023, 07:02:43 pm ---That sounds like an IPv6 address, which is 32 hex digits long.

Do you have IPv6 enabled on any of the boxes?

--- End quote ---

Here my number, data removed (# representing 1 hex digit) but leaving the "2d" hex dashes which ChatGPT pointed out to me:
##2d####2d####2d####2d####2d####
0r,
##-####-####-####-####-####

IPV6 is colons, and would be:
####:####:####:####:####:####:####:####

If it's a DHCPv6 Client DUID then it would be:
##-##-##-##-##-##-##-##-##-##-##-##-##-##

The actual Bosch Inverter has a web login, and in there it lists only an IPV4 MAC address.

Ian.

AndyBeez:
Might be a DHCP conflict? Check the server subnet is something like 255.255.255.0, the inverter is expecting to be a DHCP client and, the port is plugged on a phy-interface matching the 192.168.1.* subnet.

As suggested, run ipconfig /all at the comand prompt

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