Hello!

I have Mikrotik CRS122-8G-4S with configured advanced WAN failover - two independent uplinks from two different ISPs. Main link is connected to ether1, backup link - ether2. Ether 4,5,6,7 bridged, ether3 and 8 unused (for now, in the future I will use them to connect home-security devices to manage my home anti-theft system by my mobile).

Unfortunately, I have problem with network speed. On Mikrotik I'm reaching max 30/20 Mbit/s network speed of 200/20 what I have from my main ISP (checked with Speedtest.net). When I connect main uplink directly to my laptop - speed is ok and I'm using full network bandwidth. ether1 and all connected to bridge devices are linked with 1Gig speed.

What's going on? Why I can't use my full network speed? Where's my mistake, and what more info you need to try to diagnose my problem?


And for the end - sorry for all language mistakes - I'm not native speaker

Greetings from Poland

Ok, I probably know the reason... CPU is too weak to use it as a router :/

Hello juhas!

Had you checked your CPU usage? Try checking your system resource while doing a speedtest @ ookla and see if it's a CPU bottleneck. Of course, if your cpu reach 100%, maybe it's something that's using all your box, so we can check up your NAT rules and etc...

Best regards,

Ok, I probably know the reason... CPU is too weak to use it as a router :/

I was writing at the time you've posted this hehehehe...

Of course you can enable fasttrack to speed up your NAT and reduce cpu usage. Remind that every rule that you put in your Filter / Firewall rules does a huge amount of processing depending upon the way you have it configured. The CPU is weak for hard processing, but the switch chip (believe me) is very powerful. So you may try this option (Enable Fasttrack).

Read this: http://wiki.mikrotik.com/index.php?titl ... edirect=no

Good luck

Whoah, I didn't expect such fast, simple and useful information

Yeah, it helped a lot. Now I have 100Mbit result in Ookla Speed Test, and may be even more - I've connected old desktop PC with FastEthernet network card, so I don't know full results and currently no direct access to device

Thank you so much!