isc-dhcp-server problem when changing subnet IP net

Question

I've got Linux set up in VirtualBox. To practice things for school I was trying to make isc-dhcp-server work but I've got a weird problem. DHCP server works only with this configuration:

    # A slightly different configuration for an internal subnet.
subnet 192.168.5.0 netmask 255.255.255.0 {
  range 192.168.5.100 192.168.5.110;
  option domain-name-servers 8.8.8.8;
  option domain-name "something.local";
  option subnet-mask 255.255.255.0;
  option routers 192.168.5.255;
  option broadcast-address 192.168.5.254;
  default-lease-time 600;
  max-lease-time 7200;
#
}

And Linux LAN adapter ip: 192.168.5.1/24 With such configuration everything works just fine on Windows 7. If I only change ip addressing to for example:

subnet 192.168.1.0 netmask 255.255.255.0 {
  range 192.168.1.100 192.168.1.110;
  option domain-name-servers 8.8.8.8;
  option domain-name "something.local";
  option subnet-mask 255.255.255.0;
  option routers 192.168.1.255;
  option broadcast-address 192.168.1.254;
  default-lease-time 600;
  max-lease-time 7200;
#
}

And Linux LAN adapter ip to: 192.168.1.1/24 DHCP doesn't work. I do restart isc-dhcp-server after making any changes in /etc/dhcp/dhcpd.conf I've got this homework in which I have to configure the DHCP for 172.16.19.0 network, how do I do it, what am I doing wrong? Could please somebody help me to get this to work?

Answer 1

what do you mean:

DHCP doesn't work

Different symptom references to different issues. There can be many possible problems likely on routing or interface state or configuration.

Try dhcpd -d *interface* on server or dhclient -d *interface* on client, maybe cat /var/log/syslog | grep DHC* to check whether packets are sent successfully, or try ip route show' ,ip neigh show` then(not sure it would help, but since I dont have enough reputation to comment, I have to answer). Hope it helps.