Summary
RADIUS, short for Remote Authentication Dial-In User Service, is a remote server that provides authentication and accounting facilities to various network apliances. RADIUS authentication and accounting gives the ISP or network administrator ability to manage PPP user access and accounting from one server throughout a large network. The MikroTik RouterOS has a RADIUS client which can authenticate for HotSpot, PPP, PPPoE, PPTP, L2TP and ISDN connections. The attributes received from 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 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 |
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This sub-menu allows to add/remove RADIUS clients.
The order of added items in this list is significant.
Properties
| Property | Description |
|---|---|
| accounting-backup (yes | no; Default: no) | Whether configuration is for 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 RADIUS Server. |
| realm (string; Default: ) | Explicitly stated realm (user domain), so the users do not have to provide proper ISP domain name in user name. |
| secret (string; Default: ) | Shared secret used to access the RADIUS server. |
| service (ppp|login|hotspot|wireless|dhcp; Default: ) | Router services that will use this RADIUS server:
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| src-address (ipv4/ipv6 address; Default: 0.0.0.0) | Source IP/IPv6 address of the packets sent to RADIUS server |
| timeout (time; Default: 100ms) | Timeout after which the request should be resend |
When RADIUS server is authenticating user with CHAP, MS-CHAPv1, MS-CHAPv2, it is not using shared secret, secret is used only in authentication reply, and router is verifying it. So if you have wrong shared secret, RADIUS server will accept request, but router won't accept reply. You can see that with /radius monitor command, "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 setup 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 setup 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: |
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This facility supports unsolicited messages sent from RADIUS server. Unsolicited messages extend RADIUS protocol commands, that allow to terminate a session which has already been connected from RADIUS server. For this purpose DM (Disconnect-Messages) are 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
| Property | Description |
|---|---|
| accept (yes | no; Default: no) | Whether to accept the unsolicited messages |
| port (integer; Default: 1700) | The port number to listen for the requests on |