Completely unstable 951G and bridged 952AC

RouterOS Beginner Basics
1

Have two brand new routers, 951G main, 952Ui-5ac2nD bridged (from master port to WAN), also have around 20 clients, wireless mostly, they semi-worked, every time need to rebooting devices, DHCP server is mad, set lease time at 100d, but even at 3 hours, clients left without internet somehow. But wired clients feels even worse, 5AC have latency and speed problem, connection randomly down(maybe shaper not work I dont know), even my winbox periodically log-outing(5AC only) already tired to restart my PC adapter, as much as clients

all my settings — default
firmware — stable
2017-05-25 12-38-32 admin@192.168.88.247 (BRIDGED_RB952Ui-5ac2nD) - WinBox v6.39.1 on hAP ac lite (mipsbe).png

2

Autonegotiation on both sides. Rstp off. Ros 6.39.1. Updated firmware to latest. Try other cable and different ports on both ends. Then you will see.

3

Autonegotiation on both sides. Rstp off

ok, which of the interfaces? bridge? btw Auto negotiation already switched ON on every interface

firmware to latest

RC firmware — is terrible, one time I even lost connection with ISP, by 100% correct settings, not to mention the other oddities

other cable

maybe problem in POE ? 12V 1A for 25m cable is it right? only one router at the end, with two active lan’s(+wan) and wlan’s of course

Thank you for fast answer, I will be watching in the evening

4

Do not mix firmware and system version. Just use 6.39.1 system, and update the firmware (to 3.33 or 3.35 or what it will offer), if it is not the latest. Do not use RC in production.

When you use POE, swith the “poe-in-long-cable” to yes.
https://wiki.mikrotik.com/wiki/Manual:PoE-Out#Global_settings

Injectors can be also the reason of port flapping.

Keep off (R)STP on bridges until you need it.

12V for poe (together with long wires especially) is also not smart, better to use voltage around 20-30V.

5

ok I get it

swith the “poe-in-long-cable” to yes.

951G doesn’t have POE tab

Injectors can be also the reason of port flapping.

but it official from Mikrotik store

Keep off (R)STP on bridges until you need it.

and when I need them? I read about a little, and it seems such a good thing huh

use voltage around 20-30V.

I think amps is more important, I have 12V 3A power adaptor, but ok
2017-05-25 15-00-41 admin@192.168.88.247 (BRIDGED_RB952Ui-5ac2nD) - WinBox v6.39.1 on hAP ac lite (mipsbe).png

6

Measured the speed again, about 10MB, when main router have all 100MB/sec, so I dropped 220V line to my attic, powered the router directly and now all works just fine :slight_smile:

now I wondering, why is that !? power adapter have 12VA, router needs only 8, I am disappointed in POE technology

7

~_~
2017-05-25.png

8

No need to be disappointed. You need to understand the physical principles. Just remember to use higher voltage when thin long wires are in use. Nothing strange.

9

I have a good news — the main problem was in another DHCP server, which is worked(when I thought not) at bridged router, after I cleared out all DHCP tabs, everything works as it should, thanks for support :wink: