en:l_atelier:routeurmikrotik

Routers MikroTik offer professional solutions at affordable prices, ideal for personal use. Whether you're looking for routers, switches or Wi-Fi access points, they all work under the same roof. RouterOS. Whatever the device, each model can fulfil the roles of router, firewall and witch. You can start with a model like the hEX lite, available for around 40€.

You can also test RouterOS on a virtual machine virtual for 24 hours

I've also created a project that lets you test Mikrotik router configurations in docker images. Voir the project page

Features

MikroTik routers offer the following features:

For more information, see the documentation</ignore><ignore> .

Features in detail

Safe Mode

<note important>The Safe Mode protects against configuration errors that could lead to loss of access. </WRAP>

From the command line, press CTRL-x to activate this mode, identified by the indication in the prompt.

How does it work?

In Safe Mode, the router periodically tests the connectivity between itself and the administrator's SSH session. If a loss of connection is detected, it restores the previous configuration.

To save your changes while remaining connected, deactivate Safe Mode by pressing CTRL-x again.

Firewall

MikroTik routers incorporate two types of firewall: Layer 2 and Layer 3.

Layer 3 example

/ip/firewall/filter
# Input
add action=accept chain=input comment="accept established,related,untracked" connection-state=established,related,untracked
add action=drop chain=input comment="drop invalid" connection-state=invalid
add action=accept chain=input comment="accept to local loopback (for CAPsMAN)" dst-address=127.0.0.1
add action=drop chain=input comment="drop all not coming from LAN" in-interface-list=!LAN log=yes log-prefix=BAN

# Forward
add action=fasttrack-connection chain=forward comment="fasttrack" connection-state=established,related hw-offload=yes
add action=accept chain=forward comment="accept established,related,untracked" connection-state=established,related,untracked
add action=drop chain=forward comment="drop invalid" connection-state=invalid
add action=drop chain=forward comment="drop all from WAN not DSTNATed" connection-nat-state=!dstnat connection-state=new in-interface-list=WAN

# Masquerade
/ip firewall nat
add action=masquerade chain=srcnat comment="masquerade" ipsec-policy=out,none out-interface-list=WAN

VLAN

VLANs can be used to isolate several network flows within the same bridge. This makes it possible, for example, to separate traffic between the LAN and a DMZ without any interaction between them. Here are two important concepts:

  • Tagged (trunk) Adding a VLAN number to the Ethernet header of the IP packet, for compatible devices. (<ignore></ignore>802.1Q).
  • Untagged Removal of the VLAN number to make the packet accessible to standard devices.

Example

The following example configures two VLANs: LAN (2) and DMZ (3). All ports are dedicated to the LAN, except :

  • ether10 for the DMZ.
  • ether2used as a tagged trunk to transport LAN and DMZ flows.

# Désactiver temporairement le filtrage VLAN
/interface/bridge
set [find where name="bridge"] vlan-filtering=no

# Associer tous les ports au VLAN-LAN (PVID 2)
/interface/bridge/port
set [find] pvid=2

# Associer ether10 au VLAN-DMZ (PVID 3)
set [find where interface=ether10] pvid=3

# Configurer le trunk (ether2)
/interface/bridge/vlan
add bridge=bridge comment=eth2-lan tagged=ether2,bridge vlan-ids=2
add bridge=bridge comment=eth2-dmz tagged=ether2,bridge vlan-ids=3

# Créer les interfaces VLAN
/interface/vlan
add interface=bridge name=vlan-lan vlan-id=2
add interface=bridge name=vlan-dmz vlan-id=3

# Adressage IP
/ip/address
add address=192.168.2.254/24 interface=vlan-lan
add address=192.168.3.254/24 interface=vlan-dmz

# Configurer les pools DHCP
/ip/pool
add name=dhcp-lan ranges=192.168.2.128/25
add name=dhcp-dmz ranges=192.168.3.128/25

# Ajouter les serveurs DHCP
/ip/dhcp-server
add address-pool=dhcp-lan interface=vlan-lan
add address-pool=dhcp-dmz interface=vlan-dmz

Application of the configuration

To preserve all the previous configuration (still in ), I resort to safe mode by pressing the keys CTRL-x.

I can now activate the VLAN filteringby executing the following commands (remembering to enable save mode):

# Note: Press [CTRL-x] In the terminal prompt, after the prompt line, you must see text

# Enable vlan filtering /interface/bridge set [find where name=“bridge”] ] vlan-filtering=yes

Practical tools

Logs

View logs in real time :

/log/print follow

Filter logs by keyword :

/log/print where message~"BAN" 

14:33:48 firewall,info BAN INPUT 80 input: in:ether1 out:(unknown 0), connection-state:new src-mac aa:bb:cc:dd:dd:ee, proto TCP (SYN), 80.75.212.9:50264->192.168.0.88:80, len 40
14:37:55 firewall,info BAN INPUT 80 input: in:ether1 out:(unknown 0), connection-state:new src-mac aa:bb:cc:dd:dd:ee, proto TCP (SYN), 62.169.22.37:40244->192.168.0.88:80, len 40
15:13:31 firewall,info BAN INPUT 80 input: in:ether1 out:(unknown 0), connection-state:new src-mac aa:bb:cc:dd:dd:ee, proto TCP (SYN), 194.50.16.198:57018->192.168.0.88:80, len 40
15:22:55 firewall,info BAN INPUT 80 input: in:ether1 out:(unknown 0), connection-state:new src-mac aa:bb:cc:dd:dd:ee, proto TCP (SYN), 93.174.93.12:60000->192.168.0.88:80, len 40

Ping

Testing an IP address :

/tool/ping address=8.8.8.8 count=5 

SEQ HOST                                     SIZE TTL TIME       STATUS                                                                                                                   
  0 8.8.8.8                                    56 249 27ms336us 
  1 8.8.8.8                                    56 249 28ms654us 
  2 8.8.8.8                                    56 249 28ms473us 
  3 8.8.8.8                                    56 249 28ms657us 
  4 8.8.8.8                                    56 249 28ms434us

Sniffer

Capture network traffic on an interface :

/tool/sniffer/quick duration=1 

INTERFACE  TIME   NUM  DIR  SRC-MAC            DST-MAC            VLAN  SRC-ADDRESS                 DST-ADDRESS                 PROTOCOL  SIZE  CPU
ether2     0.904  668  <-   aa:bb:cc:dd:dd:ee  aa:bb:cc:dd:dd:ee   254  192.168.254.114:33842       142.251.37.234:443 (https)  ip:tcp     109    0
bridge     0.904  669  <-   aa:bb:cc:dd:dd:ee  aa:bb:cc:dd:dd:ee   254  192.168.254.114:33842       142.251.37.234:443 (https)  ip:tcp     109    0
vlan-lan   0.904  670  <-   aa:bb:cc:dd:dd:ee  aa:bb:cc:dd:dd:ee        192.168.254.114:33842       142.251.37.234:443 (https)  ip:tcp     105    0
ether1     0.904  671  ->   aa:bb:cc:dd:dd:ee  aa:bb:cc:dd:dd:ee        192.168.88.22:33842         142.251.37.234:443 (https)  ip:tcp     105    0
ether1     0.919  672  <-   aa:bb:cc:dd:dd:ee  aa:bb:cc:dd:dd:ee        140.82.121.3                192.168.88.22               ip:icmp     98    0
vlan-lan   0.919  673  ->   aa:bb:cc:dd:dd:ee  aa:bb:cc:dd:dd:ee        140.82.121.3                192.168.254.100             ip:icmp     98    0
bridge     0.919  674  ->   aa:bb:cc:dd:dd:ee  aa:bb:cc:dd:dd:ee   254  140.82.121.3                192.168.254.100             ip:icmp    102    0

Torch

Analyse live network flows:

/tool/torch interface=ether1 src-address=0.0.0.0/0 dst-address=0.0.0.0/0 ip-protocol=any mac-protocol=any% 

MAC-PROTOCOL  IP-PROTOCOL  SRC-ADDRESS     DST-ADDRESS   TX        RX         TX-PACKETS  RX-PACKETS
ip            icmp         140.82.121.3    192.168.88.22  784bps    784bps              1           1
ip            icmp         142.251.37.227  192.168.88.22  784bps    784bps              1           1
ip            icmp         192.168.0.1     192.168.88.22  41.9kbps  41.9kbps            5           5
ip            tcp          18.197.249.189  192.168.88.22  1488bps   976bps              2           1
ip            tcp          45.45.148.7     192.168.88.22  1248bps   1728bps             2           3
ip            tcp          71.18.255.144   192.168.88.22  17.6kbps  51.3kbps            9          11

System Resources

Displaying router resources :

/system/resource print 

uptime: 1d23h10m42s
                version: 7.14.1 (stable)
             build-time: 2024-03-08 12:50:23
       factory-software: 6.44.6
            free-memory: 906.9MiB
           total-memory: 1024.0MiB
                    cpu: ARM
              cpu-count: 4
          cpu-frequency: 533MHz
               cpu-load: 0%
         free-hdd-space: 418.5MiB
        total-hdd-space: 512.0MiB
write-sect-since-reboot: 140623
       write-sect-total: 1569203
             bad-blocks: 0%
      architecture-name: arm
             board-name: RB4011iGS+5HacQ2HnD
               platform: MikroTik

Updating Packages

Display and update package versions:

/system package update check-for-updates 

channel: stable
installed-version: 7.14.1
   latest-version: 7.16.2
           status: New version is available

Installing the update :

/system package update install

RouterOS update

Display RouterOS version and update :

/system routerboard print 

routerboard: yes
           model: RB4011iGS+5HacQ2HnD
        revision: r2
   serial-number: D43B0C96671D
   serial-number: DXXXXXXXXXXX
   firmware-type: al2
factory-firmware: 6.45.9
current-firmware: 6.45.9
upgrade-firmware: 7.16.2

Update and restart : 

/system routerboard upgrade 
/system reboot

Sources

  • en/l_atelier/routeurmikrotik.txt
  • Dernière modification : 2025/10/11 19:57
  • de 127.0.0.1