How to set up netplan in Ubuntu for 2 networks per 1 interface?

Question

ubuntu

There is a current network: 192.168.10.0/24
Gateway: 192.168.10.1
DNS: 192.168.10.1
There is a second network where the domain controller is: 192.168.20.0/24
Gateway: 192.168.20.1
DNS: 192.168.20.1
The gateway is one piece of iron, with two interfaces . Set up computers under win, everything works fine.
Under Ubuntu, the second network pings, but something is wrong with the DNS, it does not see the domain.
ifconfig shows 2 interfaces: lo and eno1

network:
 version: 2
 renderer: networkd
 ethernets:
   eno1:
     dhcp4: no
     addresses: [192.168.10.10/24]
     gateway4: 192.168.10.1
     nameservers:
          addresses: [192.168.10.1, 8.8.8.8]
    eno1:1:
     dhcp4: no
     addresses: [192.168.20.10/24]
     gateway4: 192.168.20.1
     nameservers:
          search: [my.domain.com]
          addresses: [192.168.20.1, 8.8.8.8]

as a result, ifconfig does not display the address from network 20, but "ip a" shows it on the lo interface

Answer 1

Now network interface aliases (eno1:1) are not fashionable, several addresses are assigned to one interface:

network:
 version: 2
 renderer: networkd
 ethernets:
   eno1:
     dhcp4: no
     addresses: [192.168.10.10/24, 192.168.20.10/24]
     gateway4: 192.168.10.1
     nameservers:
          search: [my.domain.com]
          addresses: [192.168.10.1, 192.168.20.1, 8.8.8.8]