Hi, I have recently set up my new RB2011UiAS-2HnD-IN at home.

It will have a residents' Wlan and guest. Internet is coming in through fibre optic SFP port.
However, for some reason I do not have internet. When I connect the same SFP module into D-Link 615 (where it came from) all work well on D-link, but when I switch the SFP module into Mikrotik, I have no internet.

Below are some of the settings I used:

When this happens during my day job it means the SFP isn't supported in the device. You might need to buy a MikroTik SFP or ask around about ones that work.

Did you get a log message about it?

Can you see laser light coming from the SFP? (May be hazardous to your health...)

You forgot to specify the type of the SFP so what can we say?

When this happens during my day job it means the SFP isn't supported in the device. You might need to buy a MikroTik SFP or ask around about ones that work.

Did you get a log message about it?

Can you see laser light coming from the SFP? (May be hazardous to your health...)

I looked for the light, but couldn't see any. But I plugged it in its original router, and there is internet. So I guess the line is ok.

Also the provider said over the phone that they don't see any problems with the line.

RE the logs, I didn't think about it. Will have a look and post it here tomorrow.
Winbox I believe identifies the SFP module as Huawei something.

Will make screen of that page too.

If the module will prove to be the problem, can I only use modules listed on Mikrotik shop site,or is there a more extensive list based on trials by users?

You forgot to specify the type of the SFP so what can we say?

I will make a picture of it tomorow, but Winbox called it Huawei I think

You have alread read this thread about the same subject?
viewtopic.php?f=2&t=84599

You have alread read this thread about the same subject?
viewtopic.php?f=2&t=84599

Just read it now, thank you very much!
UPD. it seems they did not find a solution there.
I do have indeed 100MBps connection from the provider.

The photo of my Sfp module is below:




also the screens from winbox regarding the SFP module:

A 100 Mbit only SFP is not going to work, see the other topic.
You need an SFP that does rate conversion to 1 Gbit internally, in that other topic a type of SFP is mentioned, lets see if they get that to work.
I am myself looking for an SFP that does VDSL, and it exists, but it is not widely available yet.
That SFP does not work when set to autonegotiate like you did. It requires a fixed 1000 Mbps rate.
Maybe you can try experimenting with that too.

To correct/clarify what I said earlier - That's a single mode optic so you won't see light coming out of it.

I'm not familiar with optical to the residence, I wasn't aware that it's single mode. I guess it would be unless you were less than 300 meters or so from the device providing the connection.

A 100 Mbit only SFP is not going to work, see the other topic.
You need an SFP that does rate conversion to 1 Gbit internally, in that other topic a type of SFP is mentioned, lets see if they get that to work.
I am myself looking for an SFP that does VDSL, and it exists, but it is not widely available yet.
That SFP does not work when set to autonegotiate like you did. It requires a fixed 1000 Mbps rate.
Maybe you can try experimenting with that too.

I am ready to experiment if someone (you?) can tell me please what to do.
I did not tick "auto-negotiate" it was like this. So I shall untick it, right?

What else in you opinion can be done, before buying a different SFP?

To correct/clarify what I said earlier - That's a single mode optic so you won't see light coming out of it.

I'm not familiar with optical to the residence, I wasn't aware that it's single mode. I guess it would be unless you were less than 300 meters or so from the device providing the connection.

correct, residential connection, only one fiber optic coming into SFP

The physical connection (single/multimode, single/dual fiber, wavelength) is not relevant to the problem.
I mentioned a thread above after a quick search but there is another thread that mentions an actual SFP that does 1 Gbit/s
at the router interface while doing 100 Mbps over the fiber (rate conversion inside the SFP). I believed it was the thread
I referred to but apparently there is another one. You will have to find it yourself.

The physical connection (single/multimode, single/dual fiber, wavelength) is not relevant to the problem.
I mentioned a thread above after a quick search but there is another thread that mentions an actual SFP that does 1 Gbit/s
at the router interface while doing 100 Mbps over the fiber (rate conversion inside the SFP). I believed it was the thread
I referred to but apparently there is another one. You will have to find it yourself.

OK, thank you! I will keep looking.

In the meantime, can anyone tell me what is the RJ45 connector on the back of the router for? It is not on the specification as far as I can see.

The physical connection (single/multimode, single/dual fiber, wavelength) is not relevant to the problem.
I mentioned a thread above after a quick search but there is another thread that mentions an actual SFP that does 1 Gbit/s
at the router interface while doing 100 Mbps over the fiber (rate conversion inside the SFP). I believed it was the thread
I referred to but apparently there is another one. You will have to find it yourself.

After unticking "Auto-link" I finally have "Link ok" message.

The lead corresponding to SFP is on, so I think I have the link now - many thanks to this forum:


however, there is still no internet.



Now, can we assunme, that my SFP model is working and I should look into problems elsewhere (router configuration for example)?
Or the fact that I got the green led on and "link ok" message does not automatically mean that my SFP module is working with my provider and this RB2011?

In the meantime, can anyone tell me what is the RJ45 connector on the back of the router for? It is not on the specification as far as I can see.

It is a serial port, it is wired according to the de-facto standard for serial on RJ45 used by Cisco, Procurve etc.
When you have locked yourself out on the network ports e.g. due to bad firewall config you can use it to logon to the router.
It also displays low-level messages during boot that you can use when it fails to boot.
Or it can be used to connect another device (that is not too sensitive to this random message garbage) and you can connect it over TCP, e.g. to
remotely configure something.

Do you know the settings for the internet connection? maybe you can find them in your old router.
E.g. does it use DHCP, PPPoE, maybe some VLAN, etc.

In the meantime, can anyone tell me what is the RJ45 connector on the back of the router for? It is not on the specification as far as I can see.

It is a serial port, it is wired according to the de-facto standard for serial on RJ45 used by Cisco, Procurve etc.
When you have locked yourself out on the network ports e.g. due to bad firewall config you can use it to logon to the router.
It also displays low-level messages during boot that you can use when it fails to boot.
Or it can be used to connect another device (that is not too sensitive to this random message garbage) and you can connect it over TCP, e.g. to
remotely configure something.

thank you!

Do you know the settings for the internet connection? maybe you can find them in your old router.
E.g. does it use DHCP, PPPoE, maybe some VLAN, etc.

Unfortunately, I am very weak in networking.

It is a D-link DIR-615, and this is screen from it:



I can of course connect again and look for other settings if I would know were to look.
From my discussion with the provider, it is DHCP

How can I test for sure that internet is coming into my router from the provider please?

I have tried to bridge today SFP and ether2, but I cannot get IP addresses for these interfaces.


No ping either:

Do you know the settings for the internet connection? maybe you can find them in your old router.
E.g. does it use DHCP, PPPoE, maybe some VLAN, etc.

here they are:

..but I can't find SFP setting anywhere on my old router

UPDATE:
I think here they are:

not sure if anyone is following this, but this might be useful to someone in a similar position.

I learned that I need VLAN settings. A call to the provider revealed that VLAN ID is 33 in my case.
Created a VLAN interface with this ID, no luck yet.

before that I experimented with id 37, maybe someone can tell me what doesn't feel right on the screen below:

Did you assign the dhcp-client under the vlan interface so that you get a public IP?