CAPsMAN-election

Scripts for a Dynamic CAPsMAN network with Mikrotik RouterOS

Idea

All RouterOS devices are preconfigured. They build a ad-hoc network and elect one device as CAPsMAN.

1. All routers connect each other by ospfv3 (IPv6)
2. Additional they build a network by ospfv2 (IPv4)
3. They provides on every ethernet interface a unique IPv4 subnet for clients
4. There is one primary CAPsMAN in the whole network
5. There is one primary DNS-Server to distribute DNS-Names to all other routers
6. The Router with a default route propagates it to the whole network

Concept

Base ID

• Every router has his one uniqe id (between 0 and 255).
• Every router has a loopback device
  • IPv6-Address fd58:9c23:3615::ID
  • IPv4-Address 172.16.0.ID

Scheduled Configuration changes

There is a cron job (named check-master) everey minute who detects some topology changes and apply configuration changes (if needed).

OSPFv3 (IPv6)

They connect by OSPFv3 over IPv6 together

• Router ID: 172.16.0.ID
• search for neighbors routers on all ethernet devices

IPv4 configuration

The IPv4-Configuration on a ethernet device depends if there is a other router with a lower router id on the same layer 2 segment.

If this is the single router or the router with the lowest id

• IP-Address 10.ID.EthernetId.1/24
• DHCP-Server enabled

If there is a router with a lower id

• IP-Address configured by DHCP (but not set the default route)
• DHCP-Server disabled

OSPFv2 (IPv4)

• Router ID: 172.16.0.ID
• search for neighbors routers on all ethernet devices

CAPsMAN

• The router with the lowest ID is the CAPsMAN.
  • It has additionally the ip fd58:9c23:3615:ffff
• There is a eoipv6 tunnel between CAPsMAN and all CAP devices
• Every local WLAN device will be connected to CAPsMAN

Setup

Requirements

• Some Routers with RouterOS from Mikrotik
• Connections between the routers (Ethernet cable)

Software Update (if needed)

1. Update router at least to 6.36.3

/system package update install

2. Install wireless-rep (if not already there)
3. Download extra packages from http://www.mikrotik.com/download for your Platform
4. Extract wireless-rep-* and copy to your device
5. Reboot it
6. Enable wireless-rep and IPv6

/system package
  enable ipv6
  enable wireless-rep
/system reboot

Setup Configuration

1. Log into device and remove all current configuration

/system reset-configuration no-defaults=yes

2. Now connect device by serial console, mac-telnet (https://github.com/haakonnessjoen/MAC-Telnet) or Winbox (http://wiki.mikrotik.com/wiki/Manual:Winbox)
3. Set ID to variable $number. Where ID is a unique number for this Device.

:global number ID

4. Open config.rsc with your favorite text editor
5. Copy and paste the whole content it into the console on router.
6. Set password /password
7. Set a idendity /system identity set name=router-ID

Now you are ready and can connect a client PC to any ethernet-connection on your device. If your device has the ID 20 you can connect the web ui by http://172.16.0.20/