ISC DHCP Server configuration for multiple pools on Ubuntu 18.04

[pvs]

Hello,

I am setting up new ISC DHCP Server (version 4.3.5) on Ubuntu 18.04. 
This system is configured with single NIC.
Need to configure DHCP server for multiple leases on different Class C 
networks.

Googled and tried multiple ways, none of them worked.

*Contents of /etc/dhcpd/dhcpd.conf file *

authoritative;

shared-network companynetwork {
subnet 192.168.40.0 netmask 255.255.255.0{
  range 192.168.40.150 192.168.40.160 ;
option domain-name-server 8.8.8.8;
option subnet-mask 255.255.255.0;
option routers 192.168.40.1;
option broadcast-address 192.168.40.255;
default-lease-time 600;
max-lease-time 7200;
}
subnet 10.10.10.0 netmask 255.255.255.0{
  range 10.10.10.10 10.10.10.20;
  option subnet-mask 255.255.255.0;
  option routers 10.10.10.1;
  option broadcast-address 10.10.10.255;
  default-lease-time 600;
  max-lease-time 7200;
}
subnet 192.168.37.0 netmask 255.255.255.0{
  range 192.168.37.131 192.168.37.140;
  option subnet-mask 255.255.255.0;
  option routers 192.168.37.1;
  default-lease-time 600;
  max-lease-time 7200;
}
}

*Contents of/etc/netplan/50-cloud-init.yaml    -----   network 
configuration file *

network:
     version: 2
     ethernets:
        ens160:
                addresses:
                    - 192.168.40.29/24
                gateway4: 192.168.40.1
                nameservers:
                    addresses: [8.8.8.8]

With the above configuration, DHCP addresses get issued from192.168.40.0 
pool only, not from other pools.

Any help is greatly appreciated

Thanks in advance

Regards,

पं. विष्णु शंकर		P. Vishnu Sankar
टीम लीडर                Team Leader-Network Operations
सी-डॉट                  C-DOT
इलैक्ट्रॉनिक्स सिटी फेज़ I    Electronics City Phase I
होसूर रोड बेंगलूरु          Hosur Road Bengaluru – 560100
फोन  Ph                91 80 25119466
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