Here are the steps for configuring a DHCP server in a local network.
Set static IP to the second network card enp9s3 (this name can be different on a different PC) on the DHCP server PC. Run
sudo vi /etc/network/interfaces
Edit the file according to this sample:
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
# The other network interface
auto eno123
iface eno123 inet dhcp
# DHCP server interface
auto enp9s3
iface enp9s3 inet static
address 15.0.3.10
netmask 255.255.255.0
gateway 15.0.3.1
dns-nameservers 8.8.4.4 8.8.8.8
Restart network service by
sudo service networking restart
Setup DHCP server Install dnsmasq package
sudo apt-get install dnsmasq
Check out what network interfaces exist. Run ifconfig -a. The output should be something similar to this.
enp9s3 Link encap:Ethernet HWaddr 91:2b:2e:59:cf:df
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:558 errors:0 dropped:0 overruns:0 frame:0
TX packets:1616 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:67665 (67.6 KB) TX bytes:260734 (260.7 KB)
Interrupt:20 Memory:f7200000-f7220000
eno123 Link encap:Ethernet HWaddr 27:02:1f:2a:f1:ac
inet addr:192.168.122.123 Bcast:192.168.122.255 Mask:255.255.255.0
inet6 addr: fe80::279a:1f01:c7b:78b1/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:396017 errors:0 dropped:0 overruns:0 frame:0
TX packets:192658 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:361146437 (361.1 MB) TX bytes:26264534 (26.2 MB)
Memory:f7100000-f717ffff
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:753842 errors:0 dropped:0 overruns:0 frame:0
TX packets:753842 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:49121050 (49.1 MB) TX bytes:49121050 (49.1 MB)
eno123 is the other ethernet interface, which has nothing to do with our configuration here.
Now configure DHCP server by editing:
sudo vi /etc/dnsmasq.conf
Some lines should be uncommented and adjusting such as the sample here:
interface=enp9s3
bind-interfaces
dhcp-range=15.0.3.50,15.0.3.53,24h
Start dnsmasq daemon.
sudo ifconfig enp9s3 up
sudo systemctl start dnsmasq.service