/etc/network/interfaces:
============
 This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eno1
iface eno1 inet static
        address 217.19.1.2
        netmask 255.255.255.0
        network 217.19.1.0
        broadcast 217.19.1.255
        gateway 217.19.1.1
        # dns-* options are implemented by the resolvconf package, if installed
        dns-nameservers 87.117.198.200 87.117.237.100 87.117.196.200
        dns-search eu.cloudhipo.com

auto enp0s25
iface enp0s25 inet static
        address 192.168.1.2
        netmask 255.255.255.0

+++++++++++++++++++++++++++++++++++++++++++++++++++

ifconfig:
============
eno1      Link encap:Ethernet  HWaddr 0c:c4:7a:0d:76:ae
          inet addr:217.19.1.2  Bcast:217.19.1.255  Mask:255.255.255.0
          inet6 addr: fe80::ec4:7aff:fe0d:76ae/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:5941 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3322 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:456384 (456.3 KB)  TX bytes:372344 (372.3 KB)
          Interrupt:16 Memory:df900000-df920000

enp0s25   Link encap:Ethernet  HWaddr 0c:c4:7a:0d:76:af
          inet addr:192.168.1.2  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::ec4:7aff:fe0d:76af/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:680 (680.0 B)
          Interrupt:20 Memory:dfb00000-dfb20000

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:86 errors:0 dropped:0 overruns:0 frame:0
          TX packets:86 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:6496 (6.4 KB)  TX bytes:6496 (6.4 KB)

+++++++++++++++++++++++++++++++++++++++++++++++++++

iptables --table nat --list:
============
Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination

Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination
MASQUERADE  all  --  anywhere             anywhere
MASQUERADE  all  --  192.168.1.0/24       anywhere