Basic Router setup on CRS310-1G-5S-4S+

RouterOS Beginner Basics
1

Hi Guys!

Recently i got this from a friend, and being a noob i realise its not as simple to configure this as a basic router. Im trying to set my sfpplus4 (ISP providing 2.5G) to be my incoming WAN and the rest of the port to be in “bridge” and DHCP.

Current setup:-

  1. DHCP Client (sfpplus4 WAN) - ok

  2. DHCP Server (All other ports, able to get DHCP ip but no internet)

This are the only setting i did on the router.

Anyone here able to help me with this.

Thanks for reading!

2

Besides and before your configuration issue, are you sure you want to use It on a 2.5 GB connection?

Check the routing capabilities of that device.

The rule of the thumb Is considering the 512 byte routing with 25 filter rules:
https://mikrotik.com/product/crs310_1g_5s_4s_in#fndtn-testresults

Around 187 Mbps. :open_mouth:

Notwithstanding the CRS name, It Is essentially a switch.

3

Hi,
Assuming that you have your LAN side ports connected to a bridge (based on your comment that they can get addresses), you need to set up NAT under your firewall tab. This will connect your LAN side to your ISP (WAN) side.
Cheers,

4

Hi Peternz! Care to share how do i configure this part?

5

Hi! My friend who pass me this swicth mention that his used all 4 spf+ on 10g, and didnt have any issue with speed. im not sure if thats the same for WAN

6

As a switch it will have plenty of speed between your devices.

However connections to the internet via your ISP will need routing with firewalling and presumably Nat.
For 2.5G you will need a reasonably powerful router performing this task.
If your ISP provided a router you can use it for that task and use the CRS just for inside LAN switching.
Otherwise the RB5009 is worth looking at.

The CRS can do L3 switching in hardware for eg. internal vlans. But purely based on Switch ACL’s with no stateful packet processing, Nat, etc.

7

Thank you so much for the info.
So meaning to say, if im routing traffic thru ISP ill have massive speed drop? unless it act as a switch, then no issue with performance?

8

Sure,
If you use the winbox app or the webfig browser interface, firstly check to see if the port that you are using to connect to your ISP is defined in an interface list.
Go to Interface menu item, then Interface List and see if the port is defined in a ist called WAN.

Next define the NAT:
go to IP menu item then Firewall and select the NAT

  • under the general tab, the chain should be srcnat and in the “out interface list” option choose WAN. You don’t need to worry about the other options for a basic setup.
  • select the Action tab and in the property called Action, select masquerade.
    You should be good to go.

The other way to set up the device is through the Quickset Menu. If you select the router option (I haven’t checked to see if this is available on a CRS model) then everything that you need to define is on the one page. That will do an automated setup good enough to get you going and you then go into the main configuration and tweak anything that you want.

Let us know how this goes and if you need any further help.
Cheers,

9

Yep, that is exactly the point, that device is a very good switch (think of LAN, Layer 2) and a terrible router (think of WAN, Layer 3).

Again if you check the test results, you will see that the switching capabilities are 50-200x the routing ones.

2.5 GB from ISP is a lot of speed/bandwidth.

Even the rather common Mikrotik (fast) router, the RB5009, with its theoretical 3096.2 Mbps in routing, is probably a bit “tight” with a 2.5 GB ISP connection, likely a CCR2004 will be needed to get all the speed the ISP provides.