Cellular SIMcom modems 01

Summary

This article will contain example on how to configure SIMcom cellular modems in using PPP interface in RouterOS v6.xx

Article covers following models:

• SIM5360
• SIM7100

Note: LTE speeds for SIM7100 will be available only starting RouterOS v7 major release!

Configuration example / Comments

In this example we will assume that you already have basic router configuration in place (if not consult these articles: accessing router and initial configuration using webfig)

This example will be covered in CLI (command line interface) configuration method. Some additional screenshots will be included so quick view for Winbox would also be there for reference.

1. Prepare modem for use in your Router

• If you are going to be using mini-PCIe version of SIMcom modem then these actions should be performed while router is powered off.

• Insert sim-card in modem usb interface or sim-card slot that is on your router. This part depends on which modem edition you have one as mini-pcie or usb dongle version.

• Add required antennas to modem (if required) and insert it in usb or mini-pcie slot.

• Power on the router.

• Ideally we always recommend to keep router fully updated: HOWTO upgrade RouterOS

2. Check if router sees the added device

Now let's check if router sees the device that you just added and can work with it.

• Check if ROS sees the modem with command: "/interface print"

[admin@MikroTik] > interface print 
Flags: D - dynamic, X - disabled, R - running, S - slave 
 #     NAME                                TYPE       ACTUAL-MTU L2MTU
 0  R  ether1                              ether            1500  1600
 1  X  wlan1                               wlan             1500  1600
 2  R  ppp-out1                            ppp-out          1500

We can see that interface #2 is ppp-out1, it will be the modem that you just added (presuming that it is not ppp interface from some other modem/configuration that you added previously).

Additional info to check (if required/needed).

• Ports, command: "/port print"

[admin@MikroTik] > port print 
Flags: I - inactive 
 #   DEVICE NAME                    CHANNELS USED-BY                  BAUD-RATE
 0   1:2    usb1                           5 PPP <ppp-out1>           9600     

• If ROS sees modem as USB device, command: "/system resource usb print"

[admin@MikroTik] > /system resource usb print 
 # DEVICE VENDOR                   NAME                  SPEED                 
 0 1:1    Linux 3.3.5 ehci_hcd     RB400 EHCI            480 Mbps              
 1 1:2    SimTech, Incorporated    SimTech SIM5360       480 Mbps    

3. Configure the modem

Modem configuration part.

• Check ppp-client menu for required interfaces, command: "/interface ppp-client print"

[admin@MikroTik] > /interface ppp-client print
Flags: X - disabled, R - running 
 0  R name="ppp-out1" max-mtu=1500 max-mru=1500 mrru=disabled port=usb1 
      data-channel=2 info-channel=3 apn="internet.example.com" pin="" user="" 
      password="" profile=default phone="" dial-command="ATDT" modem-init="" 
      null-modem=no dial-on-demand=no add-default-route=yes 
      default-route-distance=0 use-peer-dns=yes keepalive-timeout=30 
      allow=pap,chap,mschap1,mschap2 

• Configure ppp interface, command example:

    /interface ppp-client set 0 dial-on-demand=no use-peer-dns=yes add-default-route=yes \
      data-channel=2 info-channel=3 apn=internet.example.com 

break down of this command:

     dial-on-demand=no <---  This option specifies if modem should be active only when someone is 
                             trying to use it or all the time.
     use-peer-dns=yes <--- use DNS servers that are provided by your cellular service provider.
     add-default-route=yes <--- Should default route be added (YES, if this is going to be the only
                                WAN interface on your router).
     data-channel=2 <--- Data channel over which you will access your wan connection.
     info-channel=3 <--- Info channel used for gathering debug info on modem and connection quality.
     apn=internet.example.com <--- Access point name provided to you by your operator,
     ...
     pin <---Pin code if required by sim which you are going to be using.

This part will depend on what you need to configure, first five options will be a requirement. Starting with APN other options like pin, etc configuration becomes dependent on what your cellular ISP requires. to get all available options in console while inputing press tab.

• After executing previous command to check if modem has connected you can run the same: "/interface ppp-client print" command and check if ppp interface have running flag "R". Or run monitor command: "/interface ppp-client monitor 0"

[admin@MikroTik] > /interface ppp-client monitor 0
          status: connected
          uptime: 34m12s
        encoding: 
   connect-speed: 115200
             mtu: 1500
             mru: 1500
   local-address: x.x.x.x
  remote-address: 0.0.0.0

And gotten IP address from ISP.

[admin@MikroTik] > /ip address print 
Flags: X - disabled, I - invalid, D - dynamic 
 #   ADDRESS            NETWORK         INTERFACE                              
 0 ...                              
 1 D x.x.x.x/32     x.x.x.x     ppp-out1  <----

4. Additional configuration

One last configuration piece to allow access from LAN to WAN, command: "/ip firewall nat add chain=srcnat out-interface=ppp-out1 action=masquerade"

Now to confirm that every thing has been configured correctly I suggest to run ping to some web resource from both your router and PC that is connected to lan. As if there is some problems this step might indicate where you should look for the.

5. Whole modem related configuration in short

[admin@MikroTik] > export
...
/port
set 0 name=usb1
/interface ppp-client
add apn=internet.example.com data-channel=2 dial-on-demand=no disabled=no \
    info-channel=3 name=ppp-out1 port=usb1
/ip firewall nat
add action=masquerade chain=srcnat out-interface=ppp-out1
...
[admin@MikroTik] >