Linux network does not work DHCP
 

Here is my mistake

/etc/dhcp/dhcpd.conf line 1437: subnet 10.100.179.254 netmask 255.255.254.0: bad subnet number/mask combination.
Aug 02 10:33:02 localhost.localdomain dhcpd[10131]: subnet 10.100.179.254 netmask 255.255.254.0

my network 10.100.178.0/23
L2

help me please

Not sure what to help you with; you don't give us any details about your system or what you're trying to do, set up, etc. Not even version/distro of Linux. The error is clear; you've put in a bad subnet number/mask combination. Fix it, in accordance with your network, so talk to your network admins.

And there are loads of netmask calculators you can find online...try putting your subnet into one and look at the netmask.

i would start with that subnet you have...

Per the last response, I would change the ip range and subnet
 

For example:

Existing
Change to

Yep...that's what the error message told the OP, that the subnet mask was incorrect, and that's why they were directed to use one of the many calculators, which would have told them the correct range/mask.

We don't know anything from the OP, aside from the very obvious error message.

basically solved by TBOne

subnet ID 10.100.178.0
subnet mask 255.255.254.0
broadcast address 10.100.179.255
mask bits (23)
host address range 10.100.178.1 - 10.100.179.254 (510 hosts)

Thanks
solution 10.100.178.0 subnet 255.255.254.0 was correct