Mikrotik

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Mikrotik Router DHCP Server Configuration with VLAN

IP address Configuration:

/ip address add address=103.7.248.206/29  network=103.7.248.200 broadcast=103.7.248.207 interface=WAN

VLAN Configuration on Mikrotik Router:

/interface vlan
add name=100-RED  interface=LOCAL  vlan-id=100
add name=200-GREEN  interface=LOCAL  vlan-id=200
add name=300-BLACK  interface=LOCAL  vlan-id=300
/ip address
add address=10.10.10.1/24 interface=100-RED
add address=172.16.1.1/24 interface=200-GREEN
add address=192.168.1.1/24 interface=300-BLACK

Create an IP address pool:

/ip pool add name=100-RED  ranges=10.10.10.1-10.10.10.254
/ip pool add name=200-GREEN  ranges=172.16.1.1-172.16.1.254
/ip pool add name=300-BLACK  ranges=192.168.1.1-192.168.1.254

DNS Configuration:

/ip dns set allow-remote-requests=yes cache-max-ttl=1w cache-size=5000KiB max-udp- servers=4.4.4.4,8,8.8.8.8packet-size=512

DHCP Server Configuration for VLAN:

/ip dhcp-server enable 0
/ip dhcp-server add interface = LOCAL address-pool = 100-RED
/ip dhcp-server add interface = LOCAL address-pool = 200-GREEN
/ip dhcp-server add interface = LOCAL address-pool = 300-BLACK
/ip dhcp-server  network add address = 10.10.10.0/24 gateway = 10.10.10.1 dns-server = 8.8.8.8 comment=”100-RED”
/ip dhcp-server  network add address = 172.16.1.0/24 gateway = 172.16.1.1 dns-server = 8.8.8.8 comment=”200-GREEN”
/ip dhcp-server network add address = 192.168.1.0/24 gateway = 192.168.1.1 dns-server = 8.8.8.8 comment=”300-BLACK”

NAT Configuration:

/ip firewall nat
add chain=srcnat action=masquerade src-address=192.168.1.0/24 out-interface=WAN
add chain=srcnat action=masquerade src-address=172.16.1.0/24 out-interface=WAN
add chain=srcnat action=masquerade src-address=10.10.10.0/24 out-interface=WAN

Default Gateway Setup:

/ip route add dst-address=0.0.0.0/0  gateway=103.7.248.201

VLAN filtering configuration examples

VLAN Example #1 (Trunk and Access Ports)

  • Improperly configured bridge VLAN filtering can cause security issues, make sure you fully understand how Bridge VLAN table works before deploying your device into production environments.
Alt text
Trunk and Access Ports
  • Create a bridge with disabled vlan-filtering to avoid losing access to the device before VLANs are completely configured.
/interface bridge
add name=bridge1 vlan-filtering=no
  • Add bridge ports and specify pvid for VLAN access ports to assign their untagged traffic to the intended VLAN.
/interface bridge port
add bridge=bridge1 interface=ether2
add bridge=bridge1 interface=ether6 pvid=200
add bridge=bridge1 interface=ether7 pvid=300
add bridge=bridge1 interface=ether8 pvid=400
  • Add Bridge VLAN entries and specify tagged and untagged ports in them.
/interface bridge vlan
add bridge=bridge1 tagged=ether2 untagged=ether6 vlan-ids=200
add bridge=bridge1 tagged=ether2 untagged=ether7 vlan-ids=300
add bridge=bridge1 tagged=ether2 untagged=ether8 vlan-ids=400
  • In the end, when VLAN configuration is complete, enable Bridge VLAN Filtering.
/interface bridge set bridge1 vlan-filtering=yes

VLAN Example #2 (Trunk and Hybrid Ports)

Alt text
Trunk and Hybrid Ports
  • Create a bridge with disabled vlan-filtering to avoid losing access to the router before VLANs are completely configured.
/interface bridge
add name=bridge1 vlan-filtering=no
  • Add bridge ports and specify pvid on hybrid VLAN ports to assign untagged traffic to the intended VLAN.
/interface bridge port
add bridge=bridge1 interface=ether2
add bridge=bridge1 interface=ether6 pvid=200
add bridge=bridge1 interface=ether7 pvid=300
add bridge=bridge1 interface=ether8 pvid=400
  • Add Bridge VLAN entries and specify tagged and untagged ports in them. In this example egress VLAN tagging is done on ether6,ether7,ether8 ports too, making them into hybrid ports.
/interface bridge vlan
add bridge=bridge1 tagged=ether2,ether7,ether8 untagged=ether6 vlan-ids=200
add bridge=bridge1 tagged=ether2,ether6,ether8 untagged=ether7 vlan-ids=300
add bridge=bridge1 tagged=ether2,ether6,ether7 untagged=ether8 vlan-ids=400
  • In the end, when VLAN configuration is complete, enable Bridge VLAN Filtering.
/interface bridge set bridge1 vlan-filtering=yes
  • You don't have to add access ports as untagged ports, they will be added dynamically as untagged port with the VLAN ID that is specified in PVID, you can specify just the trunk port as tagged port. All ports that have the same PVID set will be added as untagged ports in a single entry. You must take into account that the bridge itself is a port and it also has a PVID value, this means that the bridge port also will be added as untagged port for the ports that have the same PVID. You can circumvent this behaviour by either setting different PVID on all ports (even the trunk port and bridge itself), or to use frame-type set to accept-only-vlan-tagged.

VLAN Example #3 (InterVLAN Routing by Bridge)

Alt text
InterVLAN Routing by Bridge

Create a bridge with disabled vlan-filtering to avoid losing access to the router before VLANs are completely configured: 

/interface bridge
add name=bridge1 vlan-filtering=no

Add bridge ports and specify pvid for VLAN access ports to assign their untagged traffic to the intended VLAN: 

/interface bridge port
add bridge=bridge1 interface=ether6 pvid=200
add bridge=bridge1 interface=ether7 pvid=300
add bridge=bridge1 interface=ether8 pvid=400

Add Bridge VLAN entries and specify tagged and untagged ports in them. In this example bridge1 interface is the VLAN trunk that will send traffic further to do InterVLAN routing: 

/interface bridge vlan
add bridge=bridge1 tagged=bridge1 untagged=ether6 vlan-ids=200
add bridge=bridge1 tagged=bridge1 untagged=ether7 vlan-ids=300
add bridge=bridge1 tagged=bridge1 untagged=ether8 vlan-ids=400

Configure VLAN interfaces on the bridge1 to allow handling of tagged VLAN traffic at routing level and set IP addresses to ensure routing between VLANs as planned: 

/interface vlan
add interface=bridge1 name=VLAN200 vlan-id=200
add interface=bridge1 name=VLAN300 vlan-id=300
add interface=bridge1 name=VLAN400 vlan-id=400

/ip address
add address=20.0.0.1/24 interface=VLAN200
add address=30.0.0.1/24 interface=VLAN300
add address=40.0.0.1/24 interface=VLAN400

In the end, when VLAN configuration is complete, enable Bridge VLAN Filtering: 

/interface bridge set bridge1 vlan-filtering=yes
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