Manual:PPP AAA
Applies to RouterOS: 2.9, v3, v4, v5
Summary
Sub-menu: /ppp
The MikroTik RouterOS provides scalable Authentication, Athorization and Accounting (AAA) functionality.
Local authentication is performed using the User Database and the Profile Database. The actual configuration for the given user is composed using respective user record from the User Database, associated item from the Profile Database and the item in the Profile database which is set as default for a given service the user is authenticating to. Default profile settings from the Profile database have lowest priority while the user access record settings from the User Database have highest priority with the only exception being particular IP addresses take precedence over IP pools in the local-address and remote-address settings, which described later on.
Support for RADIUS authentication 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 which can authenticate for 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.
User Profiles
Sub-menu: /ppp profile
PPP profiles are used to define default values for user access records stored under /ppp secret submenu. Settings in /ppp secret User Database override corresponding /ppp profile settings except that single IP addresses always take precedence over IP pools when specified as local-address or remote-address parameters.
Properties
| Property | Description |
|---|---|
| change-tcp-mss (yes | no | default; Default: default) | Modifies connection MSS settings
|
| dns-server (IP; Default: ) | IP address of the DNS server to supply to clients |
| idle-timeout (time; Default: ) | Specifies the amount of time after which the link will be terminated if there was no activity present. There is no timeout set by default |
| incoming-filter (string; Default: ) | Firewall chain name for incoming packets. Specified chain gets control for each packet coming from the client. The ppp chain should be manually added and rules with action=jump jump-target=ppp should be added to other relevant chains in order for this feature to work. For more information look at the Examples section |
| local-address (IP; Default: ) | IP address or IP address pool name for PPP server |
| name (string; Default: ) | PPP profile name |
| only-one (yes | no | default; Default: default) | Defines whether a user is allowed to have more than one connection at a time
|
| outgoing-filter (string; Default: ) | Firewall chain name for outgoing packets. Specified chain gets control for each packet going to the client. The ppp chain should be manually added and rules with action=jump jump-target=ppp should be added to other relevant chains in order for this feature to work. For more information look at the Examples section |
| rate-limit (string; Default: ) | Rate limitation in form of rx-rate[/tx-rate] [rx-burst-rate[/tx-burst-rate] [rx-burst-threshold[/tx-burst-threshold] [rx-burst-time[/tx-burst-time] [priority] [rx-rate-min[/tx-rate-min]]]] from the point of view of the router (so "rx" is client upload, and "tx" is client download). All rates are measured in bits per second, unless followed by optional 'k' suffix (kilobits per second) or 'M' suffix (megabits per second). If tx-rate is not specified, rx-rate serves as tx-rate too. The same applies for tx-burst-rate, tx-burst-threshold and tx-burst-time. If both rx-burst-threshold and tx-burst-threshold are not specified (but burst-rate is specified), rx-rate and tx-rate are used as burst thresholds. If both rx-burst-time and tx-burst-time are not specified, 1s is used as default. Priority takes values 1..8, where 1 implies the highest priority, but 8 - the lowest. If rx-rate-min and tx-rate-min are not specified rx-rate and tx-rate values are used. The rx-rate-min and tx-rate-min values can not exceed rx-rate and tx-rate values. |
| remote-address (IP; Default: ) | IP address or IP address pool name for PPP clients |
| session-timeout (time; Default: ) | Maximum time the connection can stay up. By default no time limit is set. |
| use-compression (yes | no | default; Default: default) | Specifies whether to use data compression or not.
|
| use-encryption (yes | no | default; Default: default) | Specifies whether to use data encryption or not.
|
| use-ipv6 (yes | no | default | required; Default: yes) | Specifies whether to allow IPv6. By default is enabled if IPv6 package is installed.
|
| use-mpls (yes | no | default | required; Default: default) | Specifies whether to allow MPLS over PPP.
|
| use-vj-compression (yes | no | default; Default: default) | Specifies whether to use Van Jacobson header compression algorithm.
|
| wins-server (IP; Default: ) | IP address of the WINS server to supply to Windows clients |
Notes
There are two default profiles that cannot be removed:
[admin@rb13] ppp profile> print
Flags: * - default
0 * name="default" use-compression=no use-vj-compression=no use-encryption=no only-one=no
change-tcp-mss=yes
1 * name="default-encryption" use-compression=default use-vj-compression=default use-encryption=yes
only-one=default change-tcp-mss=default
[admin@rb13] ppp profile>
Use Van Jacobson compression only if you have to because it may slow down the communications on bad or congested channels.
incoming-filter and outgoing-filter arguments add dynamic jump rules to chain ppp, where the jump-target argument will be equal to incoming-filter or outgoing-filter argument in /ppp profile. Therefore, chain ppp should be manually added before changing these arguments.
only-one parameter is ignored if RADIUS authentication is used.
If there are more that 10 simultaneous PPP connections planned, it is recommended to turn the change-mss property off, and use one general MSS changing rule in mangle table instead, to reduce CPU utilization.
User Database
Sub-menu: /ppp secret
PPP User Database stores PPP user access records with PPP user profile assigned to each user.
Properties
| Property | Description |
|---|---|
| caller-id (string; Default: ) | For PPTP and L2TP it is the IP address a client must connect from. For PPPoE it is the MAC address (written in CAPITAL letters) a client must connect from. For ISDN it is the caller's number (that may or may not be provided by the operator) the client may dial-in from |
| limit-bytes-in (integer; Default: 0) | Maximal amount a client can upload, in bytes, for a session. |
| limit-bytes-out (integer; Default: 0) | Maximal amount a client can download, in bytes, for a session. |
| local-address (IP; Default: ) | IP address or IP address pool name for PPP server |
| name (string; Default: ) | User's name used for authentication |
| password (string; Default: ) | User's password used for authentication |
| profile (string; Default: default) | Which user profile to use. |
| remote-address (IP; Default: ) | IP address or IP address pool name for PPP clients |
| remote-ipv6-prefix (IPv6/0....128; Default: ) | Available starting from v5.0 |
| routes (string; Default: ) | Routes that appear on the server when the client is connected. The route format is: dst-address gateway metric (for example, 10.1.0.0/ 24 10.0.0.1 1). Several routes may be specified separated with commas. This parameter will be ignored for OpenVPN |
| service (any | async | isdn | l2tp | pppoe | pptp | ovpn; Default: any) | Specifies the services available to a particular user |
Active Users
Sub-menu: /ppp active
This submenu allows to monitor active (connected) users.
/ppp active print command will show all currently connected users.
/ppp active print stats command will show received/sent bytes and packets
Properties
| Property | Description |
|---|---|
| address (IP) | IP address the client got from the server |
| bytes (integer/integer) | Amount of bytes transfered through tis connection. First figure represents amount of transmitted traffic from the router's point of view, while the second one shows amount of received traffic |
| caller-id (string) | For PPTP and L2TP it is the IP address the client connected from. For PPPoE it is the MAC address the client connected from. |
| encoding (string) | Shows encryption and encoding (separated with '/' if asymmetric) being used in this connection |
| limit-bytes-in (integer) | Maximal amount of bytes the user is allowed to send to the router |
| limit-bytes-out (integer) | Maximal amount of bytes the user is allowed to send to the client |
| name (string) | User name supplied at authentication stage |
| packets (integer/integer) | Amount of packets transfered through tis connection. First figure represents amount of transmitted traffic from the router's point of view, while the second one shows amount of received traffic |
| service (async | isdn | l2tp | pppoe | pptp | ovpn) | Type of service the user is using |
| session-id (string) | Shows unique client identifier |
| uptime (time) | User's uptime |
Remote AAA
Sub-menu: /ppp aaa
Settings in this submenu allows to set RADIUS accounting and authentication. Note that RADIUS user database is consulted only if the required username is not found in local user database.
Properties
| Property | Description |
|---|---|
| accounting (yes | no; Default: yes) | Enable RADIUS accounting |
| interim-update (time; Default: 0s) | Interim-Update time interval |
| use-radius (yes | no; Default: no) | Enable user authentication via RADIUS |
Examples
Add new profile
To add the profile ex that assigns the router itself the 10.0.0.1 address, and the addresses from the ex pool to the clients, filtering traffic coming from clients through mypppclients chain:
[admin@rb13] ppp profile> add name=ex local-address=10.0.0.1 remote-address=ex incoming-filter=mypppclients
[admin@rb13] ppp profile> print
Flags: * - default
0 * name="default" use-compression=no use-vj-compression=no use-encryption=no only-one=no
change-tcp-mss=yes
1 name="ex" local-address=10.0.0.1 remote-address=ex use-compression=default
use-vj-compression=default use-encryption=default only-one=default change-tcp-mss=default
incoming-filter=mypppclients
2 * name="default-encryption" use-compression=default use-vj-compression=default use-encryption=yes
only-one=default change-tcp-mss=default
[admin@rb13] ppp profile>
Add new user
To add the user ex with password lkjrht and profile ex available for PPTP service only, enter the following command:
[admin@rb13] ppp secret> add name=ex password=lkjrht service=pptp profile=ex [admin@rb13] ppp secret> print Flags: X - disabled # NAME SERVICE CALLER-ID PASSWORD PROFILE REMOTE-ADDRESS 0 ex pptp lkjrht ex 0.0.0.0 [admin@rb13] ppp secret>