SOLVED : RB4011iGS+RM : Unable to get more than 250Mbps Internet connection

Hardware MikroTik hardware general
1

Hi,
I have been using Mikrotiks as a home router roughly for the past 10 years. I had the chance to try some models :


951G-2HnD, 2011UiAS-2HnD and lately (well, as of today) : RB4011iGS+RM

I have a 400Mbps rated Internet connection.
Connecting my laptop directly on the cable-modem gives me the 400Mbps download speed no sweat.

However, Laptop directly on the RB4011iGS+RM ether2 with cable-modem on ether1 and the “default” router config, I cannot get more than 200 - 230MBps of download speed.

I would like to know if I am doing something wrong and help to where to look at.

2

if I may add, the issue seems to be related to the bridge performance. I am getting a hard time getting the full 1Gbps on the bridge with no traffic. On the bridge, I get 550-600Mbps between 2 computers.

3

Can you authenticate with your ISP with PPPoE ? If yes give it a try…

4

my ISP does not use PPPOE, I get an IP directly from the cable-modem in DHCP. There is no authentification going on, they use the cable-modem MAC address to allow/disallow connection to their network.

5

Is the 4011 running the latest ROS 6.46.5 ?
Is the configuration the default one or not ?

6

On my first post I said it was running the default config.

.
Yes it is at the latest RoS.

I also read this thread which looks similar to my problem without success in resolving my issue : http://forum.mikrotik.com/t/rb2011-slow-internet-even-with-fasttrack/123079/1

7

On my first post I said it was running the default config.

I asked so that i be sure you have not run Quickset 10 times above the default config or made any changes…
4011 is a powerful router and can Route traffic a lot higher than the one you report… Most probably something else causes this issue…

8

something else like what ? Laptop → cable modem = 400mbps
laptop → rb4011 → cable modem = 250mbps

9

Using WinBox make a Supout.rif package and copy it off to your computer.
Go to System/Reset Configuration and select “No Default Configuration”. Click on “Reset Configuration”.
After Router reboots, go to System/Reset Configuration and don’t select any options then click on “Reset Configuration”.
After the router reboots again test the router speed.

10

I ve seen this “solution” recently in the forum… Indeed it work for an RB2011 if i remember right…
It worth trying…
Although it is not some standard procedure even if it works…

11

Did EXACTLY what you suggested. Did not fix the issue. Here are two videos :
I do 3 consecutive test each time.
BW test with Mikrotik and Laptop : https://youtu.be/7ZSO0q5O58A

BW Test with Laptop on Cable-Modem only : https://youtu.be/-gZSZqhM8Vw

With my current config (Prod) I get 200mbps only.
default_config_after_reset.rsc (3.51 KB)

12

For me the problem is the double NAT…

13

What double nat?

14

When already natted traffic goes an other time through a NAT.

https://medium.com/@gmanual/double-nat-explained-and-possible-solutions-8b41b6c651bd
https://www.pcworld.com/article/3175739/how-to-identify-and-resolve-double-nat-problems.html

15

I know what double nat is.
I don’t see this condition in my setup.

16

Update : If I throw a random Gb Switch between the cable-modem and the RB4011 ETH1, I get constant speed at or over 350mbps.

The issue looks like a HW compatibility between the cable-modem and the RB4011 (same for my RB2011 btw).
Cable modem is a Technicolor TC4400-AM

17

I don’t see this condition in my setup.

Then sorry but you don’t know what double NAT is…
Yes there is double NAT in your setup…

Internet → ISPs Router does NAT → RB4011 Does NAT → Computer

Cable modem is a Technicolor TC4400-AM

This is a Modem/Router…

18

Well, I do not consider the double-nating from the modem/router. It depends on which mode it has been setup. I get a valid Internet Ip Address, so I am not considering it double nating at the moment.

I have found some things, see next post.

19

Update :
It is not my mikrotik config.

I am investigating. but for sure, having that switch between the modem and the mikrotik sure did help a lot for some reason.

20

Latest Update : I need to keep that Gigabit switch between the RB4011 and the modem to get the full bandwidth.
The bandwidth drops by 100mbps and more if the RB4011 is connected directly to the modem.

Anyone got a similar experience ? HW compatibility issue ?