Some problem with HA and network

Hi, eweryone!
I have a problem in my network with Home Assistant.
My network (192.168.11.0/24) contains WiFi AP (OpenWRT 192.168.11.201), Home Assistant Supervised on Debian 13 (192.168.11.200 DHCP Static), Mikrotik router as gateway (192.168.11.10) and all my smart devices.
HA installed correctly with no errors, works normally, has access to Internet.
And exist another network (192.168.12.0/24) for laptops and PCs.
I want control HA by my laptop. So I have configure Microtik to access from one network to another.
And I have access to AP and other devices but not to HA.
My investigation show that HA do not respond on any request from Gateway (Mikrotik).
(I think it maybe maid specially for more security.)
So I can Ping from Mikrotik to AP, I can Ping HA from AP, but no pings from Mikrotik to HA.
I even don`t understand where is a problem in Debian host or in Home Assistant.
Can you help me?
Any advises?

These are on 2 different networks and will not talk to each other unless you do some network magic and bridge them. This defeats pretty much the reason for seperating them.

HA is designed to work on a flat network, and anything beyond that is up to you to get working. My suggestion is put this stuff all on the same network, not split it up in vlans.

Thanks for your answer.
But because reality of my country (Russia) I need two networks (one of it throught VPN, second - direct).
I bridged networks, and other devices accessible but HA not.
Even if I try telnet 192.168.11.200:8123 direct from Microtik no connection establishing.
There is not my network problem but settings of HA.

Then you need to find out what protocol is not bridged.
Personally I don't know the answers, but you need to bridge what is missing.
There are likely some answers in the forum here so searching is your friend.

Does Home Assistant find devices on the network? Check the settings -> system -> network, network discovery.

I absolutely sure problem not in bridge.
In "flat" network (192.168.11.0/24) I can not establish connection between router (192.168.11.10) and HA (192.168.11.200) besides router to AP and AP to HA works right!

Yes, HA has found all devices and work correctly.

On which Device have you defined this network ?
Why have you defined (192.168.11.10) as Gateway ?
What is your DHCP-Scope, And your DHCP-Server ?

Network defined by Gateway router "Mikrotik".
I am "Old School" system administrator, so I used to setup gateway not * . * . * .1 address for security. I understand that now it no mater, but habit.
DHCP Scope 192.168.11.11-192.168.11.200 on DHCP server built-in Mikrotik. 192.168.11.200 (HA) determined as "Static"
192.168.11.10 static address for Mikrotik router.

So what are you using this for ?

As ( SG ) mentioned above, seems like you are trying your best to make it hard for your self And your Routing/mDNS etc

I`m starting to think it is no HA problem, but host system "Debian 13" which hosts HA.
I do not understand the Debian, I used to Xubuntu or Linux Mint.
May be I must ask about my problem from them?

Yes, just strike HA from your Topic header, and you have it narrowed down to Network Problems

NOTE: HA works fine within the DHCP-Scope with your iot device

AP connected to router "Mikrotik" by two VLANs (remember about two networks) and do WiFi for each network.
Because OpenWRT have many tools, I was try ping HA from it, and it works.
Also for testing my Mikrotik I was try ping my AP from it and vice verse.

A am very sorry but majority losing word "Supervised".
I think it is main!
My hardware have no UEFI and can not support native HAOS.
My networks works fine, I almost 20 years system administrator.

My very first(or 3) HA install was a Supervised in debian 10, ages ago

Okey, and it's hard to get cheap hardware which have ?

Great thanks everybody answered!
But in my area time to go sleep.
I will read and comprehend all your posts tomorrow!

I am rather poor man.
Because I am lazy...