I can`t remember anything, so I’m recording

MS DHCP. The specified address is not available.

specified ip address is not available

Do not believe your eyes If you are Microsoft Windows admin!

 

PS C:\Windows\system32> Add-DhcpServerv4reservation -ScopeId 172.25.205.0 -IPAddress 172.25.205.243

Командлет Add-DhcpServerv4Reservation в конвейере команд в позиции 1
Укажите значения для следующих параметров:
ClientId: 10-e7-c6-e5-4b-ce
Add-DhcpServerv4reservation : Не удалось зарезервировать IP-адрес 172.25.205.243 для ClientID/ClientDUID 10-e7-c6-e5-4b
-ce в области 172.25.205.0 на DHCP-сервере MS-DHCP-001.
строка:1 знак:1
+ Add-DhcpServerv4reservation -ScopeId 172.25.205.0 -IPAddress 172.25.205.243
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ResourceUnavailable: (172.25.205.243:root/Microsoft/…erv4Reservation) [Add-DhcpServerv
   4Reservation], CimException
    + FullyQualifiedErrorId : DHCP 20011,Add-DhcpServerv4Reservation

 

netsh dhcp server initiate reconcile is not working! Have to check dump and real state:

1. netsh dhcp server dump > c:\dump

2. CTRL+F “PROBLEM MAC-ADDRESS”

3. DELETE Reserved IP even if you see not this PROBLEM MAC-address from DHCP

 

 

Do not believe your eyes!

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