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Summary

RADIUS, short for Remote Authentication Dial-In User Service, is a remote server that provides authentication and accounting facilities to various network appliances. RADIUS authentication and accounting gives the ISP or network administrator the ability to manage PPP user access and accounting from one server throughout a large network. The MikroTik RouterOS has a RADIUS client that can authenticate for HotSpot, PPP, PPPoE, PPTPL2TP, and ISDN connections. The attributes received from the RADIUS server override the ones set in the default profile, but if some parameters are not received they are taken from the respective default profile.

The RADIUS server database is consulted only if no matching user access record is found in the router's local database.

If RADIUS accounting is enabled, accounting information is also sent to the RADIUS server default for that service.

RADIUS Client

Sub-menu: /radius

This sub-menu allows adding/remove RADIUS clients. 

 The order of added items in this list is significant.

Properties

PropertyDescription
accounting-backup (yes | no; Default: no)Whether the configuration is for the backup RADIUS server
accounting-port (integer [1..65535]; Default: 1813)RADIUS server port used for accounting
address (IPv4/IPv6 address; Default: 0.0.0.0)IPv4 or IPv6 address of RADIUS server.
authentication-port (integer [1..65535]; Default: 1812)RADIUS server port used for authentication.
called-id (string; Default: )Value depends on Point-to-Point protocol: PPPoE - service name, PPTP - server's IP address, L2TP - server's IP address.
certificate (string; Default: )Certificate file to use for communicating with RADIUS Server with RadSec enabled.
comment (string; Default: )
disabled (yes | no; Default: no)
domain (string; Default: )Microsoft Windows domain of client passed to RADIUS servers that require domain validation.
protocol (radsec | udp; Default: udp)Specifies the protocol to use when communicating with the RADIUS Server.
realm (string; Default: )Explicitly stated realm (user domain), so the users do not have to provide proper ISP domain name in the user name.
secret (string; Default: )The shared secret used to access the RADIUS server.
service (ppp|login|hotspot|wireless|dhcp; Default: )Router services that will use this RADIUS server:
  • hotspot - HotSpot authentication service
  • login - router's local user authentication
  • ppp - Point-to-Point clients authentication
  • wireless - wireless client authentication (client's MAC address is sent as User-Name)
  • dhcp - DHCP protocol client authentication (client's MAC address is sent as User-Name)
src-address (ipv4/ipv6 address; Default: 0.0.0.0)Source IP/IPv6 address of the packets sent to the RADIUS server
timeout (time; Default: 100ms)Timeout after which the request should be resent, example radius set timeout=300ms numbers=0

When the RADIUS server is authenticating the user with CHAP, MS-CHAPv1, MS-CHAPv2, it is not using a shared secret, the secret is used only in authentication reply, and the router is verifying it. So if you have the wrong shared secret, the RADIUS server will accept a request, but the router won't accept a reply. You can see that with /radius monitor command, the "bad-replies" number should increase whenever somebody tries to connect.

If RadSec is enabled, make sure your RADIUS Server is using "radsec" as the shared secret, otherwise, RADIUS Server will not be able to decrypt data correctly (unprintable characters). With RadSec RouterOS forces the shared secret to "radsec" regardless of what has been set manually (RFC6614).

Example

To set up a RADIUS Client for HotSpot and PPP services that will authenticate against a RADIUS Server (10.0.0.3), you need to do the following:

[admin@MikroTik] > /radius add service=hotspot,ppp address=10.0.0.3 secret=ex
[admin@MikroTik] > /radius print
Flags: X - disabled
# SERVICE CALLED-ID DOMAIN ADDRESS SECRET
0 ppp,hotspot 

To set up a RADIUS Client with RadSec, you need to do the following:

[admin@MikroTik] > /radius add service=hotspot,ppp address=10.0.0.3 secret=radsec protocol=radsec certificate=client.crt
[admin@MikroTik] > /radius print
Flags: X - disabled
# SERVICE CALLED-ID DOMAIN ADDRESS SECRET
0 ppp,hotspot 10.0.0.3 radsec

Make sure the specified certificate is trusted. 

To view RADIUS Client statistics, you need to do the following:

[admin@MikroTik] > /radius monitor 0
pending: 0
requests: 10
accepts: 4
rejects: 1
resends: 15
timeouts: 5
bad-replies: 0
last-request-rtt: 0s

Make sure you enable RADIUS authentication for the desired services:

/ppp aaa set use-radius=yes
/ip hotspot profile set default use-radius=yes

Connection Terminating from RADIUS

Sub-menu: /radius incoming

This facility supports unsolicited messages sent from the RADIUS server. Unsolicited messages extend RADIUS protocol commands, that allow terminating a session that has already been connected from the RADIUS server. For this purpose, DM (Disconnect-Messages) is used. Disconnect messages cause a user session to be terminated immediately. 

RouterOS doesn't support POD (Packet of Disconnect) the other RADIUS access request packet that performs a similar function as Disconnect Messages

Properties

PropertyDescription
accept (yes | no; Default: no)Whether to accept the unsolicited messages
port (integer; Default: 1700)The port number to listen for the requests on
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