Help in configuring DHCP server on ubuntu 18.04

[trgapp16]

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

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 this configuration, i get DHCP addresses from192.168.40.0 pool only, not from other pools.

Googled and found some people suggesting to configure the system network for trunk to handle multiple network pools.

Any help is greatly appreciated

Thanks in advance

Regards,

Mounika M

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