ISP FIber

RouterOS General
1

Hey people, i have a problem, here is my topology

Internal LAN <–Mikrotik Router <— Fiber Carrier (SDSL)<---- ISP

I have my eth0 configured for my fiber line using a vlan and parameters (Public IP, NAT, gateway) that my ISP provided me
I also have eth1 configured as my internal LAN plus a DHCP with google DNS

The thing is that my network is experiencing some intermittent connections. Every time i go to a Speedtest web page for example in my case it’s supposed to be 25MB download and 25MB Upload and the results everytime is 19-20MB download and 4-5MB Upload. I also asked my ISP their MTU cnfiguration and they keep telling me that they are using the default 1500 but when i do a ping 8.8.8.8 -f -l 1468 (1468 + 28 = 1496)it works, beyond 1468 like 1469+ it gets fragmented

Any thoughts?

2

Hi,

Check CPU load, it could be an issue if MK board is weak. I don’t think its an MTU issue, those values are typical.
Also try different speedtest servers and compare results.

3

Hi,

What device are you using? maybe is poor for your network.

How many connections have?

If you use a RB750 with 200 clients, you need a total throughput very high and this RB maybe works over your limit.

Use “queue’s”? A lot of Firewall rules?

I agree with “leonset”, cheks the performance on “system/Resources”.



See you,

4

Thanks both for the quick response.

I think it’s the RB2011iL-IN 10 ports (5 fast ethernet and 5 Gigabit)

There is no firewall rule, queues, nothing, just a nat rule for my internal LAN and internal clients doesn’t go beyond 80

I’m going to do more troubleshooting and probably try another router just to see the difference

5

I have a RB2011 works fine with 500-600 clients, queues, firewall rules and every networks. This model is very versatile.

Can you check the performance?

With your connections and configuration the CPU and memory should not be overloaded.

You can check without track connections. This option makes work CPU.

6

:confused: I asked if a technician from our fiber carrier can verify the fiber modem and all the fiber cables just to be sure because all the troubleshooting that i did was me only connected to the network, i disconnected all my clients and devices all day

I will keep you all in touch if something comes up

Thanks