Is option netbios-name-servers working?

[Glenn Satchell]

Hi,

The client sends a dhcp-option-request asking for a list of specific 
options. The server only sends the options to the client if it asks for 
them, and if it is configured.

Can you find the DHCPREQUEST packet from the client in your wireshark 
dump and see what options it asked for?

What does your dhcpd.conf look like?

regards,
Glenn

On 2021-10-08 03:01, p0wn3rs wrote:
> Hi,
> 
> I was doing some testing with dhcp-server-4.4.1, and although option
> netbios-name-servers  is configured, is not being pushed to the
> client.
> This is the tcpdump that I see (verified also with wireshark) and
> netbios-name-servers is no where to be found in the DHCP Offer.
> 
> 17:50:38.398426 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none],
> proto UDP (17), length 353)
>     192.168.0.15.67 > 192.168.0.21.68: [udp sum ok] BOOTP/DHCP, Reply,
> length 325, xid 0x88cd9dd1, secs 1, Flags [none] (0x0000)
>       Your-IP 192.168.0.21
>       Client-Ethernet-Address 08:00:27:80:d0:80
>       Vendor-rfc1048 Extensions
>         Magic Cookie 0x63825363
>         DHCP-Message Option 53, length 1: ACK
>         Server-ID Option 54, length 4: 192.168.0.15
>         Lease-Time Option 51, length 4: 2920
>         Subnet-Mask Option 1, length 4: 255.255.255.0
>         Domain-Name-Server Option 6, length 8: 192.168.0.15,1.1.1.1
>         Domain-Name Option 15, length 4: "test"
>         Default-Gateway Option 3, length 4: 192.168.0.15
>         NTP Option 42, length 8: 192.168.0.15
> 
> Am I looking in the wrong place or is it really not working?
> 
> thanks.
> 
> 
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