Ping two virtual machines through a router machine (different networks)

Hello,

I have connected four virtual machines under VMware Workstation Pro 2019 with another machine functioning as a router.
Two machines (1 and 2) are on the same network;
Two other machines (3 and 4) are on the same network;
The two networks are not the same.
The 5th machine is connected to all four other machines.
From machines 1 and 2, I can ping each other and the 5th machine, they are on VMnet2 host-only.
From machines 3 and 4, I can also ping each other and the 5th machine, they are on VMnet3 host-only.
(The host-only DHCP is disabled)

This is what has already been done.
Now, I need to connect machines 1 and 4, then machines 2 and 3 (which are on different networks) via the router machine.
To connect the machines, I created a .yaml file and wrote in it (respecting the spaces):

network:
 version: 2
 renderer:networkd
ethernets:
 ens33:
 addresses: [192.168.88.1/29]
 gateway: 192.168.88.1
 nameservers:
 addresses: [8.8.8.8, 8.8.4.4]
 dhcp4: false
 dhcp6: false
 routes:
 - to: 192.168.30.2
 via: 192.168.88.3
 

The IP of my first machine is 192.168.88.1/29
The IP of my second machine is 192.168.88.2/29
The third one is 192.168.30.1/29
The fourth is 192.168.30.2/29
And the 5th one has two IPs:
- 192.168.30.3/29
- 192.168.30.1/29

My machines 1, 4, and 5 are powered on but the ping is not going through.
They tried to explain it to me, but I couldn't reproduce it.
Does anyone have a solution, please?
Thank you very much.

Have a good day.