Weird, complex Problem (hardware? environment? software?)

RouterOS General
1

Hello dear humans,

Recently I have experienced weird problem with Mikrotik hardware.
I don not know if it is hardware or software issue, but I think,
the configuration is basic and I have tested it at home.

Hardware:
1 x Mikrotik RouterBOARD 433
2 x WiFi cards
1 x Power adaptor 24V 0.8A
1 x Simple switch
1 x PC server

Config:
WiFi users --bridge1–> Mikrotik --ehternet2–> Switch ----> PC ----> Internet

Interface “bridge1” on Mikrotik has both WiFi card (wlan1, wlan2) and “ehternet3” interfaces included.
DHCP runs on the “bridge1”. The gateway and dns for WiFi is Mikrotik. DNS redirects to PC.
Default route for Mikrotik is PC.
Addresses are

WiFi users ← 192.168.2.0/24 → [192.168.2.1]Mikrotik[192.168.1.2] ← 192.168.1.0/24 → [192.168.1.1]PC[...] <----> Internet

Firewall rules are absent.
As I said, configuration is very basic and worked at home.


We put it onto 40-meter tower and connected 2 antennas.
The temperature is below 0, about -10C.
First, I wanted it to handle 3 WiFi cards which would be wired with 3 antennas but
this caused problems connecting to any of WiFi networks (wlan1, wlan2, wlan3).
Then, I wanted it to handle 3 antennas with 2 WiFi cards but
every time we switched on the third antenna, nothing could connect to “wlan1” or “wlan2”.

We tried different RouterBOARD_433 cards with different WiFi cards.
We tried different versions of RouterOS (v3.30, v4.16)
We tried all possible wifi settings with bridge and without bridge.
WiFi users have CCQ=90-100%
I measured AC (~240V) and DC(24V) voltage, it seems to be alright.

The result is weird.
Sometimes, it connects, sometimes not (wlan1, wlan2, ethernet3).
When we first had put it, it worked, now it doesn’t.
Mikrotik pings internet servers.
Wifi user successfully gets IP from DHCP, resolves names, and pings PC server..
but when the connection is made to internet server, it hangs up. In the IP->Firewall->Connections it’s said “syn sent”..


Please help, I have no ideas.
It’s cold in here :]

2

I don’t know whats the exact problem. Can you specify?

You CAN use 3 cards with 433. 2.4ghz and 5ghz, BUT depending on the cards, I suggest to use 24V with 1,5A. 0,8A could not be enough.

3

Where is the masquerade or srcnat? You will need to either masquerade the 192.168.2.0/24 net at the Mikrotik router (double NAT), or route the 192.168.2.x net back to the Mikrotik router from the PC (better).

As for the bridge, I don’t use them on wifi stuff. I assign separate subnets and dhcp servers to each card.

4

Thanks for you replies!


The problem solved yesterday.

What we did:

replaced (3d time) RouterBOARD_433 card with new update v5.0rc7 (it had been 3.30/4.16)
replaced WiFi-cards with 3 standard R52 cards (it had been EnGenius 600mW)

Then it worked!
We also plugged the third antenna into it.
Now the network is ok.
Maybe it is the lack of power. I will try to find more powered adaptor.


We had issues with routing with TP-LINK router (it worked only with srcnat masquerade),
that’s why we put PC server (nat and route to 192.168.2.0/24).

5

In addition..

There was also a problem with our ISP, so that’s why my first post is so fuzzy.